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OPERATION MANUALMANUAL

MODEL 8300 SERIES STL SYSTEM

INE

P/N 5004-8300Rev IJune 13, 1988Equipment Serial No.Shipping Date

OPERATION MANUAL


TFT, Inc.3090 Oakmead Village Drive

P.O. Box 58088Santa Clara, CA 95052TEL (40) 727-7272TWX 910-338-0584FAX (408) 727-5942

TFT OPERATION MANUAL ADDENDUM

MODEL 8300 MANUAL REVISION LEVEL I EFFECTIVITY S/N

IMPORTANT MANUAL CHANGES

The following revisions have been made to this manual:

1. Meter Board and Power Supply Board AssemblyThe Meter Board drawings and parts list, 6601-3395 and 6608-3395, were revised in order to improve the input audio level.Text changes were made to reflect the changes.

2. Power Supply BoardThe Power Supply Board drawings and parts list, 6601-3396 and6608-3396, were revised in order to correct the timing window.

3. Synthesizer BoardTo improve the product, the Synthesizer Board (6601-3376) hasbeen replaced with the Synthesizer Board drawings and parts list,6601-3556 and 6608-3556.

4. DriverTo improve the product, the 1 Watt Driver Board ( 6601-3378) hasbeen replaced with the Driver Board drawings and parts list,6601-3673 and 6608-3673. The text in Paragraph B4.3.6 wasrevised to reflect this change.

5. 8300 Block DiagramUpdated Block Diagram, 6600-2281, to reflect the change from the1 Watt Driver Board to the Driver Board, 6601-3673. The text inParagraphs B4.2 and B4.3.5 was revised to reflect this change.

6. Updated the Receiver Main Board schematic, 6601-3513, and IFBoard schematic and parts list, 6601-3510 and 6608-3510, in Part D.

7. Stereo Decoder BoardTo improve the product, the Stereo Decoder Board (6601-3370) andits associated drawings and parts list have been replaced with6601-3665 and 6608-3665 drawings and parts list. The text inParagraphs F2.3, F3.1, and F3.2 were revised to reflect thischange.

8. The IF Repeater Board (option) was added to this manual asPart G. The following were added to reflect this addition:

Part G, Table of ContentsPart G, Section 1: General InformationPart G, Section 2: InstallationPart G, Section 3: Theory of OperationDrawings and parts list: IF Repeater Schematic, 6601-3711

IF Repeater PCB Assy., 6608-3711IF Repeater Parts List, 6608-3711

Date 07-17-89Form No. 5300-0268

TABLE OF CONTENTS

PART A MODEL 8300 SERIES STL SYSTEM

PART B MODEL 8300 SERIES STL TRANSMITTER

PART C MODEL 7770 TRANSMITTER AUTOMATIC CHANGEOVER

PART D MODEL 8301B SERIES STL RECEIVER

PART E MODEL 7773 RECEIVER AUTOMATIC CHANGEOVER

PART F STEREO DECODER OPTION

* PART G IF REPEATER OPTION

* Denotes items that have been revised, replaced, and/or added.

SECTION A

Model 8300 Series STL System

TABLE OF CONTENTS

Page

SECTION Al GENERAL INFORMATION A1-1

* A1.1 System Description A1-1

* A1.2 Specifications A1-1

A1.3 Warranty Al -3

A1.4 Claim for Damage in Shipment A1-4

SECTION A2 INSTALLATION A2-1

A2.1 Unpacking and Inspection A2-1

A2.2 Preinstallation Checkout A2-1

A2.2.1 Transmitter A2-1

A2.2.2 Receiver A2-2

A2.2.3 Transmitter Automatic Changeover (optional) A2-2

A2.2.4 Receiver Automatic Changeover (optional) A2-3

A2.3 Installation and Connections A2-3

A2.3.1 Antenna Connections A2-3

A2.3.2 Transmitter Audio A2-4

A2.3.3 Receiver Audio A2-4

A2.3.4 Transmitter Hot Standby Connections (Fig. 1) A2-4

A2.3.5 Receiver Hot Standby Connections (Fig. 2) A2-5

SECTION A3 OPERATION A3-1

A3.1 General A3-1

A3.2 Controls, Connectors, and Indicators A3-1

A3.2.1 Transmitter Front Panel (Fig. 3) A3-1

* A3.2.2 Transmitter Rear Panel (Fig. 4) A3-2

A3.2.3 Receiver Front Panel (Fig. 5) A3-3

A3.2.4 Receiver Rear Panel (Fig. 6) A3-4

A3.2.5 Transmitter Automatic Changeover UnitFront Panel (Fig. 7) A3-5

A3.2.6 Transmitter Automatic Changeover UnitRear Panel (Fig. 8) A3-5

A3.2.7 Model 7773 Receiver Automatic ChangeoverUnit Front Panel (Fig. 9) A3-6

A3.2.8 Receiver Automatic Changeover UnitRear Panel (Fig. 10) A3-6


SECTION A

GENERAL INFORMATION

A1.1 System Description

The TFT Model 8300 Studio Transmitter Link (STL) Systemprovides a more reliable method than conventional telephone lines fortransferring program material from a studio site to a station broadcasttransmitter. The STL system makes it possible to transmit a composite FMstereo signal, consisting of a main and stereo signal, plus two subcarriersover only one link. The subcarriers can be used for secondary program materialor remote control signals.

Excellent signal-to-noise ratio, low distortion, and highfrequency stability are achieved in the 8300 Series Transmitters by the use ofdirect FM modulation and phase -locked loop (PLL) carrier frequency synthesis.To these qualities the 8300 Series Receivers add high signal selectivity, highgain with low noise, and a unique pulse -counting discriminator circuit whichprovides excellent phase -linear characteristics for better stereo separationand lower crosstalk than more conventional methods. All receivers are crystalfequency controlled superheterodyne units.

An optional Hot Standby system is available for bothtransmitter and receiver. These systems automatically switch to an alternatestandby unit if the primary unit fails, assuring a secure and reliable linkfrom studio to transmitter.

For a Hot Standby system, the Model 7770 TransmitterAutomatic Switchover unit can be used with any of the STL transmitters, and theModel 7773 Receiver Automatic Switchover unit can be used with any of thereceivers.

For further information regarding individual components inthe system, refer to the following sections:

Section B 8300 TransmitterC 7770 Auto Changeover (Transmitter)D 8301 ReceiverE 7773 Auto Changeover (Receiver)

A1.2 SpecificationsSYSTEMFrequency Range 940-960 MHz standard

Other frequencies available on request

A1-1

Frequency Response

Distortion (THD & IMD)

Stereo Separation

Stereophonic Subchannel toMain Channel Crosstalk

Main Channel to StereophonicSubchannel Crosstalk

Signal -to -Noise Ratio

TRANSMITTERRF Power Output

RF Output Connector

Deviation for 100%Modulation

Frequency Stability

Spurious and HarmonicEmission

Modulation Capability

Modulation Inputs

Power Source

Monitoring Capability

RECEIVERRF Input Connector

Sensitivity

+.1 dB or better 30Hz to 53 kHz+.3 dB or better 53 to 75 kHz

0.2% or less 30 Hz to 53 kHz(Typically less than 0.1% at 1 kHz)

50dB or better, 50 Hz to 15 kHz(typically 55 dB or better); 45 dBwith narrow IF.

50 dB or better

50 dB or better

75 dB or better below 100% modulationde-emphasized left or right

4 Watts minimum; 10-14 Watts maximum

Type N Female, 50 ohms

+50 kHz

Better than .0001%, 0°C to 50°C

60 dB or more below carrier level

One Stereo Composite Program and TwoSubcarrier Channels

Composite: 2.2 V peak -to -peak(0.775 Vrms), 6 kohms balanced and3 kohms unbalanced, BNC andterminal strip 1 and 2. Multiplex:1.5 V peak -to -peak, 10 kohms BNC (2each); frequency range 110 to 220 kHz.

115/230 Vac +10%, 50/60 Hz, 80 watts

One 3 1/2" analog meter for monitoringpower output, power supply, bias voltagesmultiplex and program modulation. LEDbargraph for monitoring 70 to 120% pro-gram channel modulation.

Type N Female, 50 ohm

40 uV or less required for 60 dB SNRbroadband, de-emphasized. 100 uV or lessrequired for 60 dB SNR left or right channel demodulated.

Al -2

Selectivity (wide) 3 dB IF bandwidth +200 kHz60 dB IF bandwidth +700 kHz80 dB IF bandwidth +1.2 MHz

Selectivity (narrow) 3 dB IF bandwidth +150 kHz60 dB IF bandwidth +500 kHz80 dB IF bandwidth +1.2 MHz

Modulation Outputs Composite: 2.2 V peak -to -peak, 100 ohmsbalanced and 50 ohms unbalanced, BNC andclip lead. Multiplex: 1.5 V peak -to -peak50 ohm BNC and teminal stip barrier.

Power Source 115/230 VAC + 10%, 50/60 Hz, 10 watts

Monitoring Capability One 3-1/2" analog meter for monitoring powersupplies, 0 to 120% modulation for program andmultiplex channels. LED bargraph for moni-toring input RF level and modulation 70 to120%.

A1.3 Warranty

TFT, Inc. warrants each of the instruments of itsmanufacture to be produced to meet the specifications delivered to the BUYER;and to be free from defects in material and workmanship. TFT will repair orreplace at its option, for a period of one year (two years for STL's) from thedate of delivery of equipment, any Parts that are defective from faultymaterial or workmanship.

Instruments found to be defective during the warrantyperiod shall be returned to the factory with transportation charges prepaid byBUYER. It is with respect to any nonconforming equipment and parts thereof andshall be in lieu of any other remedy available by aonlicable law. All returnsto the factory must be authorized by the SELLER, before such returns. Uponexamination by the factory, if the instrument is found to be defective, theunit will be repaired and returned to the BUYER, with transoortation charaesprepaid by SELLER.

Transportation charges for instruments found to bedefective within the first thirty (30) days of the warranty period will be Paidboth ways by the SELLER.

Transportation charges of warranty returns, wherein failureis found not to be the fault of the SELLER, will be paid both ways by theBUYER.

NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. TFT IS NOTLIABLE FOR CONSEQUENTIAL DAMAGES.

A1-3

Reference Name

6 INT T P

7

8

MUX 2

MUX 1

9 PRGM SIG pushbuttonswitch

10 Meter

11 Bargraph Display

12 RF PWR ADJUST

Function

Selects the internal test point formonitoring on front panel meter. User

selectable positions are:

PA Supply

Output VCO LOOP VOLTAGEOutput VCO LEVEL1 watt Driver LevelSample PLL LEVELSample PLL LOOP VOLTAGEVCO MOD LEVEL

VCO MOD LOOP VOLTAGEFrom the factory they are set to monitorthe VCO MOD LOOP VOLTAGE

Selects MUX 2 input signal formonitoring on front panel meter(100% = +12 kHz deviation)

Selects the combined MUX 1 and inputsignal (100% = +12 kHz deviation) formonitoring on fFont panel meter.

Selects incoming program signal (100% =+50 kHz deviation) for monitoring on'front panel meter.

Indicates the voltage or signal levelselected by the pushbuttons.

Displays 70% to 120% modulation on PRGMinput.

Adjusts power supply voltage to P.A. tovary RF Power Output.

A3.2.2

Reference

Transmitter Rear Panel (Figure A3-2)

Name Function

1 BALANCED INPUT terminal Provides input connections for balancedstrip line. (Input impedance = 6K ohms).

2 MUX 1 INPUT connector Provides input connection for telemetryor SCA. (Input impedance = 10K ohms).


A3-2

PART 6

Model 8300

950 MHz Transmitter

TABLE OF CONTENTS

SECTION B 1 GENERAL INFORMATION B1-1

* 61.1 General Description 61-1* B1.2 Specifications B1-2

SECTION B 2 INSTALLATION (See Section A 2)

SECTION B 3 OPERATION (See Section A 3)

SECTION B 4 THEORY OF OPERATION

64.1 General 64-1* 64.2 Block Diagram Discussion B4-164.3 Schematic Diagram Discussion

* 64.3.1 Power Amp Assy Al 64-2* B4.3.2 Sampling Phase Lock Loop A2 -A1 B4-2

64.3.3 VCO/Modulator A2 -A2 B4-3* B4.3.4 VCO Synthesizer A2 -A3 64-3* B4.3.5 Output VCO A2 -A4 B4-4* B4.3.6 Driver A2 -A5 64-5* B4.3.7 Audio/Meter Bd. A3 B4-5

64.3.8 Bargraph Display B4-6

SECTION B 5 MAINTENANCE

65.1 General 65-165.2 Access 65-165.3 Periodic Maintenance B5-1


DWG NO.

SECTION B 6 DIAGRAMS

* Figure B1 Block DiagramModel 8300 6600-2281

Figure B2 Power Amp/Power Supply 6601-3396

Parts List and PC Assy 6608-3396

Figure B3 Sampling Phase Lock Loop A2 -A1 6601-3375


Figure B4 - VCO/Modulator A2 -A2 6601-3377


4 Figure B5 VCO Synthesizer A2 -A3 6601-3556Parts List and PC Assy 6608-3556

Figure B6 - Output VCO A2 -A4 6601-3374


* Figure B7 - Driver A2 -A3 6601-3673Parts List and PC Assy 6608-3673

* Figure B8 Audio/Meter Bd A3 6601-3395


Figure B9 Bargraph Display A4 6601-3348


Figure B10 System Wiring Diagram 6600-2271


SECTION B1

GENERAL INFORMATION

B1.1 General Description

The TFT 8300 Series STL Transmitters are for use at thestudio site in an STL System. Each generates a frequency -synthesizedcarrier, using crystal -controlled, phase -locked loops. Program audioand two additional subcarriers can frequency -modulate the carrier. RFpower output is adjustable. Built-in protection circuits shut downthe transmitter in case of synthesizer lock failure.

Two transmitters can be used with an optional Model 7770Transmitter Automatic Changeover unit to provide automatic transfer tothe standby in case of transmitter failure.

All of the transmitters are 5-1/4" high and mount in astandard 19 -inch relay rack.

Transmitter

RF Power Output

RF Output Connector

Deviation for 100% Modulation

Frequency Stability

Spurious and Harmonic Emission


Modulation Inputs

10-14 Watts adjustable downto 4 watts


±50 kHz

Better than .0001%, 0°C to50°C

60 dB or more below carrierlevel

One Stereo Composite Programand Two Subcarrier Channels

Composite: 2.2 V peak -to -peak(0.775 Vrms), 6 kohms balancedand 3 kohms unbalanced, BNCand terminal strip 1 and 2.Multiplex: 1.5 V peak -to -peak, 10 kohms BNC (2 each);frequency range 110 to 220 kHz.

Power Source


115/230 VAC + 10%, 50/60 Hz,80 Watts

One 3 1/2" analog meter formonitoring power output powersupply, bias voltages,multiplex and programmodulation, LED bargraph formonitoring 70 to 120% programchannel modulation.

B1-1

B1.2 Specifications

Frequency Range (MHz) 940-960

RF Power Output (watts, max) 14 w

Output Connector 50 ohmType NFemale

Frequency Stability (ppm/yr) +1

Frequency Accuracy:0"C to +50"C. +0.0001%

Spurious Signal Suppression:Non -Harmonically Related (dB) >-65Harmonically Related (dB) 5-65

AM Noise (dB below carrier) >-65

Freq. Dev. for 100% Mod:Composite & Monaural (kHz) +50Multiplex Channels (kHz) 74712

Modulation Input Levels: *Composite & Monaural (V rms)Multiplex (V rms)

0 775053

AC Line Power (watts) ** 70

Operating Temperature Range ("C) -10 to +50

Dimensions:

Height 5 25"(13.3 cm)

Width 19"

(48.3 cm)

Depth 13"

(33 cm)

Weight (pounds) 29

(kilograms) 13.1

* 10 k ohm input** 120/240 VAC, 50-60 Hz.

E31-2

SECTION B4

THEORY OF OPERATION

B4.1 General

The Model 8300 Transmitter uses a triple phase -lockedloop (PLL) system to develop a frequency synthesized carrieroutput in the 940-960 MHz band. The carrier can be frequencymodulated with a composite audio signal plus two multiplexsignals for program or control use. Specifications are found inSection A1.2.

B4.2 Block Diagram Discussion (Figure B1)

The transmitter carrier frequency, in the frequencyrange of 940 to 960 MHz is generated by a voltage -controlledoscillator (VCO) on the Output VCO Board. Its output isamplified by the Driver Board, which drives the 12 -Watt PowerAmplifier. The RF output can be turned on and off by switchingthe dc voltage to the Driver Board. Output power is adjusted byvarying the dc operating voltage to the Power Amplifier.

The frequency of the VCO is controlled by a phase -lockedloop (PLL) in which a sample of the VCO output is down -convertedby mixing it with an 876.5 MHz LO signal from the Sampling Phase -

Locked Loop Board. This signal, in the frequency range of 63.5to 83.5 MHz, is compared in the phase detector with a frequencyderived from a 5 MHz crystal oscillator on the VCO to itsassigned frequency.

The LO signal for the mixer on the VCO Board is gen-erated on the Sampling Phase -Locked Loop Board by a VCO in a PLLwhose reference frequency is supplied by an 87.65 MHz crystaloscillator and a X10 multiplier circuit using a step recoverydiode.

The reference frequency for the phase detector on theOutput VCO Board comes from a VCO on the VCO/Modulator Board.This VCO is in a PLL with a phase detector operating at 500 Hzfor 50 kHz steps (or 625 Hz for carrier frequencies spaced in62.5 kHz steps in the 940-960 MHz band). Audio modulation fromthe Audio/ Meter Board is applied to the VCO on the VCO/ModulatorBoard to frequency modulate the reference input to the Output VCOBoard and thus the transmitter carrier.

Inputs from all three PLLs are supplied to an alarmcircuit on the Sampling Phase -Locked Loop Board to turn on thefront panel SYSTEM LOCKED LED and turn off the RF power output ifany of these loops becomes unlocked. The alarm circuit is alsotriggered by a failure of the crystal oscillator on the VCOSynthesizer Board.

Power for all modules in the casting (Assembly A2) andfor the Audio/Meter Board comes from a supply on the Audio/MeterBoard. Power for the Power Amplifier Board comes from a supplyon the Power Amplifier Assembly, Al.

B4-1

B.4.3 Schematic Diagram Discussion

84.3.1 Power Amplifier Assembly Al (Figure B2)

This assembly contains both Power Amplifier and the Power Supply.The power supply circuit is shown at the top of Figure B2. The powertransformer and rectifier mounted on the chassis furnish +unregulated DC V topin 1 of J1. This is regulated by Ul to +12V and fed to the Driver,

which draws about 750 mA.

The unregulated voltage at Jl pin 1 is also applied to the

high -current (3.5 A) supply consisting of regulator U2 and shunt transistor Q3.R2 limits current to a safe value in case the supply output is short circuited.Ql and Q2 make up a switching circuit, controlled by the front -panel RF POWERswitch, for turning on and off the power supply and thus the 12 W Amplifier.The switching circuit also controls the power to some of the phase -lockcircuitry.

The voltage out of the high -current supply is adjusted by means ofthe front -panel RF POWER OUTPUT ADJ control, which is a 100K ohm variableresistor on the Audio/Meter Board that is connected across pins 1 and 2 of J2on the Power Supply. When the resistance across pins 1 and 2 is 0 ohms, thepower supply output if 5V; when the resistance is approximately 22K ohms, theoutput is 14V.

The circuit of the 12W Power Amplifier is shown at the bottom ofFigure B2. The input from the Driver at Ji goes to amplifier Ql through amathcing network composed of Cl and some printed inductors. Ql developsapproximately 4 W. Its collector is matched into the emitter of amplifier Q2through the matching network consisting of C5, L2, C6, and C7. Q2 is matchedinto a 50 -ohm low-pass filter and into a printed circuit directional couplerwhich, with diodes CR1 and CR2, provides dc voltages proportional to forwardand reflected power, respectively. The RF output at J2 is 12 W nominal at 50ohms. Power output can be adjusted by means of the front -panel RF ADJ controlas described in the preceding paragraph.

B.4.3.2 Sampling Phase -Locked Loop A2A1

Q7, Yl, and associated components make up a crystal oscillator

operating at 87.65 MHz. Emitter follower Q6 and amplifier Q5 feed the crystaloscillator output into the primary of transformer Ti. Ti drives step recoverydiode CR6 in a X10 multiplier circuit. The 876.5 -MHz multiplier output isapplied to one input of balanced mixer CR4/CR5. The other input to the mixercomes from voltage controlled oscillator Q4, whose nominal frequency is also876.5 MHz. If there is a difference in the two mixer input frequencies orphase, a dc voltage is produced across the mixer's resistive load. This

voltage is fed through adjustment potentiometer R28 and loop amplifier U1-7 tovaricap CR3 in the tuned circuit of Q4, tuning Q4 back into lock. The

886.5 -MHz output of Q4 is delivered to mixer Ul on the Output VCO Board. The

output is also rectified by CR8 so that its level can be checked at TP1. Theloop error voltage can be monitored at the LO test point shown at the left side

B4-2

64.3.2 Continued

loop error voltage can be monitored at the LO test point shown at the left sideof the schematic.

U1-1, Ql, Q2, Q3, and Q8, and associated components make up anunlocked -loop alarm and power -turnoff circuit. Pin 3 of comparator U1-1 isbiased to approximately 3.5V. In the absence of an alarm input, pin 2 of U1is at less than 3.5V and the comparator output at pin 1 will be +12V. Thisturns off Q1 and the front -panel SYSTEM UNLOCKED LED in its collector circuit.The output of U1-1 also turns on Q2 and Q3 to supply +12V to the Driver andthus turn on the RF output of the transmitter.

If the phase -locked loop on the Sampling Phase Lock Loop Boardbecomes unlocked, the sweeping of the dc error voltage at pin 7 of Ul will becoupled through C3 and rectified by CR2 to produce a positive voltage at pin 2of Ul. Likewise, if the phase -locked loop on the VCO Synthesizer Board or theOutput VCO Board becomes unlocked, a positive voltage will be supplied to pin 2of Ul. Any of these conditions will cause U1-1 to output -12V, which will turnon Q1 and the SYSTEM UNLOCKED LED. It will also turn off Q2 and Q3 to removeoperating voltage from the Driver and turn off the RF output of thetransmitter.

When the front -panel power switch is in the STANDBY position, itsupplies a positive voltage through J3-1 and J2-13 of the Audio/Meter Board tothe base of Q8 on the Sampling Phase Lock Loop Board. Q8 then turns off Q2 andQ3 to remove the +12V supply from the 1 W Driver. In the POWER ON position,the front panel switch supplies 0 V to reverse the operation and enable RFoutput.

B4.3.3 VCO/Modulator A2A2 (Figure B4)

The VCO for this module is common -gate FET Ql. Its tuned circuitconsists of a printed inductor connected to the drain of Q1 together withassociated capacitors. A dc tuning voltage from the phase -locked loop in theSynthesizer module comes in at E4 and is applied to varicap CR2 to keep the VCOon frequency. C15 tunes the Q1 tank circuit so that it is within the controlrange of the phase -locked loop.

The VCO output is amplified by Q2 and Q3 and delivered to the OutputVCO module via E2. The VCO output is also fed through voltage divider R2/R3 tothe phase -locked loop on the Synthesizer module.

The VCO is frequency modulated by an audio signal (MODULATION IN)from the Audio/Meter Board which is applied to varicap CR1 in the tunedcircuit of Ql. R14 adjusts the bias on CR1 so that the varicap is operating inits linear range and thus producing minimum distortion.

B4-3

4.3.4 VCO/MOD Synthesizer Board A2A3 (Figure 2.5)

The sampling signal from the VCO comes in to theVCO/MOD Synthesizer Board and goes to prescaler U3. At U3, thesignal is divided by 40 or by 41 and sent to the input of U4.

The oven -controlled crystal oscillator (5 MHz) and Ul(divide by 100) create a reference signal for phase -locked -loopfrequency synthesizer U4. Ul divides the 5 MHz (from the crystaloscillator) by 50, yielding 100 kHz. U4 consists of a selectablereference divider, two output phase detectors, a programmabledivide -by -N counter, and a programmable divide -by -A counter.These dividers are controlled by two DIP switches, SW1 and SW2.

The 100 kHz reference signal at pin 27 of U4 isdivided by 8 to yield a 12.5 kHz signal to its phase comparator.The input from prescaler U3 is further divided in U4. In U4 thedivide ratio depends on the assigned transmitter frequency and isset by DIP switches SW1 and SW2 on this board. The resultingoutput is then compared with the reference in the phase detector,resulting in an output at U4, pins 7 and 8. The output here is aphase difference which goes to loop filter U5 and its associatedRC network. The resulting output at U5, pin 7 is an errorvoltage which is routed to the VCO/Modulator Board to correctfrequency errors.

The output from the lock detector at U4, pin 28 goes toQ2 and lights LED CR1 when the PLL is out of lock. This outputalso provides an input to the alarm detector via Q3.

64.3.5 Output VCO Module A2A4 (Figure B6)

Q7 is the VCO, operating on a frequency in the range of 940 to 960

MHz. It supplies approximately 50 mW to the Driver, and also furnishes an

input to a PLL consisting of mixer Ul, amplifier Q5/Q6, phase comparator U2,

amplifier Q4/Q3, amplifier Ql, and varicap CR4. Ul mixes the 940-960 MHz

signal with an 876.5 MHz input from the Sampling Phase Lock module. The

resulting frequency in the range of 53.5 to 73.5 MHz is low-pass filtered by L2

and C3, amplified by Q5/Q6, and fed to phase comparator U2.

B4.3.5 Continued

The VCO Modulator Board outputs the identical frequency derived froma crystal oscillator on the VCO Synthesizer Board. If there is a difference infrequency or phase between the two inputs to U2, it will develop a dc outputwhich is amplified by differential amplifier Q3/Q4, and by Q1/Q2 whichfurnishes an error voltage to varicap CR4 in the tuned circuit of Q7. When theloop is out of lock, the circuitry of Q1 through Q4 will sweep the errorvoltage from -12V to +12V until the loop locks again. R16 adjusts thesymmetry.

When the loop is out of lock, the sweeping voltage at the collectorsof Q1 and Q2 is coupled by C13 to CR3. The resulting dc voltage is sent to thealarm circuit on the Sampling Phase Lock Board to turn on the alarm circuit onthe Sampling Phase Lock Board to turn on the front panel SYSTEM UNLOCKED LEDand to turn off the transmitter output.

B4.3.6 Driver A2A5 (Figure B7)

The output from the VCO Output Module, in the 940 to960 MHz range, is applied to the base of amplifier Q6 through astripline matching network. The output of Q7 is matched to atransmission line which goes to the Power Amplifier Module.

Transistors Q4 and Q5 provide overcurrent protectionfor Q6, limiting the collector current. R51 is adjusted tomaintain a constant collector current at Q6.

There is a switched +12 V from the Sampling Phase Lock

Module. This supply comes from a circuit on the SamplingLock Board that turns off the +12 V. Consequently the transmitterRF output is turned off when it senses an out-of -lock condition.

64.3.7 Audio/Meter Board A3 (Figure B8)

This board does all the audio processing for the transmitter,combining the audio signals for the VCO/Modulator Board. It also contains the

metering circuitry.

The audio input at the rear panel is brought onto the Audio/Meter

Board at J6. This input can be balanced (+) audio, or it can be compositeaudio if J6-3 is grounded. The input is applied to the differential amplifierconsisting of Ul, U2, and U3, and fed through switch S1 to U4. The switch is

placed in the position shown on the schematic for composite audio. When

monaural audio is used, the switch is placed in the opposite position which

B4-5

B4.3.7 Continued

provides 75 -microsecond preemphasis.

From U4, the audio goes into summing amplifier U5, which drives theVCO/Modulator. The MUX 1 and MUX 2 inputs at pins 6 and 8 of J4 are fedthrough level adjust potentiometers R31 and R32 into summing amplifier U6 andthen combined with the program audio in U5.

Levels are factory adjusted so that .775 V rms into the balancedinput produces +50 kHz deviation in the transmitter output frequency. A levelof 0.53 V rms at either the MUX 1 or MUX 2 input will give a 100% indication onthe front -panel meter (+12 KHz deviation).

When two subcarriers are being used, a jumper must be connectedbetween terminals E4 and E5 on the board. This cuts the gain of U6 in half, sothat both MUX 2 will indicate 100% on the meter for +6 kHz deviation. Themaximum deviation for the program signal plus all subcarriers must not exceed+62 kHz.

The metering circuit consists of U8-1, U8-7, and associatedcomponents. U8-1 is a positive peak detector with a response that is flatbeyond 200 kHz. U8-7 is the meter amplifier, which drives the front -panelmeter through pins 3 and 6 of J3. Low -voltage ac for the meter light comesfrom a transformer on the chassis via pins 4 and 5 of J3.

Input to the metering circuit is via the front -panel multiplepushbutton switch S3. When the PRGM button is pressed, the program audio isselected. It can be flat or with preemphasis depending on the connection ofthe jumper at E2. When MUX 1 or MUX 2 is pressed, the signal at the MUX 1 orMUX 2 level adjust potentiometer is selected. When INT TP is pressed, theinput comes from whichever one of the test points E7 through E13 is jumpered toE14. When -12V is pressed, a fraction of the -12V supply voltage, inverted byU7, is selected. When FWD PWR or REV PWR is pressed, the input from the

forward power or reflected power directional coupler on the Power Amplifier isselected.

The front -panel RF PWR ADJ potentiometer (R64) is in the controlcircuit of regulator U2 on the Power Supply, as described in paragraph 84.3.1.U9 and Q1 constitute a power level sensing circuit. The dc input from thedirectional coupler on the Power Amplifier Assembly, which is proportional toRF power output, is compared in U9 with a reference voltage set bypotentiometer R67. If the power level drops below the preset reference, Q1 isturned on , producting a TTL low at pin 1 of J4. Pins 1 through 4 of J4 gothrough the rear -panel REMOTE connector to an optional Model 7770 TransmitterAuto Changeover unit. A TTL low at pin 1 will cause the changeover unit toswitch transmitters, provided the MANUAL/AUTO TRANSFER switch (S2) on theAudio/Meter Board is in the AUTO TRANSFER position.

The power supply consisting of bridge rectifier K2, regulator U10,and associated components furnishes regulated -12V to the casting (from B onthe schematic) and to the Audio/Meter Board. A full -wave, high -current bridgerectifier mounted on the chassis supplies a positive input to Ull, which

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Model 83016

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TABLE OF CONTENTS

SECTION D 1 GENERAL INFORMATION D1-1

D1.1 General Description D1-1* D1.2 Specifications D1-1

SECTION D 2 INSTALLATION (See Section A 2)

SECTION D 3 OPERATION (See Section A 3)

SECTION D 4 THEORY OF OPERATION D4-1

D4.1 General D4-1D4.2 Block Diagram Discussion D4-1D4.3 Schematic Diagram Discussion D4-2

D4.3.1 Main Board D4-2D4.3.2 Front End Board D4-3D4.3.3 First Local Oscillator Board D4-4D4.3.4 63 MHz to 850 kHz IF Board D4-4D4.3.5 Display Board D4-5D4.3.6 Multiplex Filter Amplifier Board D4-5

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D2 PCB Assembly, Main BoardParts List Main Board 6608-3513

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D9 Parts List, Receiver DisplaySchematic, Mixer/Filter Assembly 6601-3511

6601-3346

D10- PCB Assembly, Mixer/Filter BoardParts List, Mixer/Filter Assembly

Figure D11 -

Figure

Figure

6608-3346

6608-35116608-3511

Schematic, Filter Amplifier 6601-3334PCB Assembly, Filter Amplifier 6608-3334

D12- Parts List, Filter Amplifier Assembly 6608-3334Wiring Diagram, STL Receiver 6600-2244

D13- Parts List, System 6600-2244


SECTION D1

GENERAL INFORMATION

D1.1 General Description

The TFT 8301B Series STL Receiver is a crystal -controlled, triple -conversion, FM superheterodyne, FM Composite receiver for use at thetransmitter site in an STL System.

All of the receivers are 3 1/2" high and mount in a standard 19 -inchrack. The circuitry, except for major power supply components, is contained ona number of printed circuit boards, most of which are in an RF casting.Operation of the printed -circuit board circuits is described in detail in

subsection 4.3.

D1.2 Specifications

RF Input Connector

Sensitivity (75 usec de-emphasized)

Selectivity (3 dB BW)


AM Rejection (400 Hz @ 10%)

Spurious and Image Rejection

Demodulated OutputsProgram

Multiplex

Harmonic Distortion

Stereo Separation

50 ohm, Type "N" female

20 uV for 55 dB Signal -to -Noise ratio100 uV for 70 dB Signal -to -Noise ratio500 uV for 80 dB Signal -to -Noise ratio(with 400 Hz high pass filter)

+200 kHz Min. (WB); +75 kHz Min. (NB)

+1.0 MHz Max. (WB); +500 kHz Max. (NB)

55 dB Min.

60 dB Min.

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SECTION F

Stereo Decoder Board Option

TABLE OF CONTENTS

Page

SECTION Fl GENERAL INFORMATION F1-1

F1.1 System Description F1-1

F1.2 Specifications F1-1

SECTION F2 INSTALLATION F2-1

F2.1 Unpacking and Inspection F2-1

F2.2 Installation and Connection F2-1

* F2.3 Adjustment F2-1

SECTION F3 OPERATION F3-1

* F3.1 General F3-1

* F3.2 Controls and Operation F3-1

SECTION F4 DIAGRAMS

Figure Fl, Block Diagram* Stereo Decoder, Schematic* Stereo Decoder, PCB Assy.

Drawing No.

6600-22886601-36656608-3665


SECTION F2

INSTALLATION

F2.1 Unpacking and Inspection

Upon receiving the option, inspect the packing box andboard for signs of possible shipping damage. Keep all packing material untilperformance is confirmed. If anything is damaged or missing, file a claim withthe transportation company, or with the insurance company if insuredseparately.

F2.2 Installation and Connection

The stereo decoder board is designed to be plugged into the8301 or 7707 main board, J8 or J9 Molex connector, which is located at therear, right side of the main board as facing the unit. Although the space isminimal, the board will fit without removing the coaxial filter on rear panel.The component side of the stereo decoder board should face away from the RFcasting when the installation is complete.

After installing the board, all the necessary connectionsare made interfacing the stereo decoder board to the main board. The rear

panel connections on the 8301 are as follows: Left "+" output, pin 1 on J5.Left "-" output, Pin 2 on J5. Right "+" output, pin 3 on J5. Right "-"

output, pin 4 on J5. All outputs are ment to be terminated into a 600 ohmload. On the 7707 the Left "+" output is J2-8. Left "-" is J2-9. Right "-" is

J2-10. Right "+" output is J2-11.

The installation of the stereo decoder board option is nowcomplete.

F2.3 Adjustment

Modulate both channels of the stereo generator with a 400

Hz signal. With an oscilloscope connected in the X -Y mode.. to the right andleft channel outputs of the 8301/7707, adjust R35for a single line on thescope. This indicates both signals are perfectly in phase. Adjust R24 for theleft channel for proper output level. Any adjustment of R3 willdegrade the performance of the stereo decoder.

OUT OF PHASE IN PHASE

NF2-1

180° OUT OF PHASE

SECTION F3

OPERATION

F3.1 General

Composite audio from the Main Board enters the StereoDecoder Board at J8 or J9, pin 6 and on to Ul, pin 2. Ul is ahigh performance PLL FM stereo demodulator.

F3.2 Controls and Operation

Control R3 adjusts the VCO frequency, which is set for76 kHz at the factory.

The left and right audio output signals then go througha 15 kHz low pass filter which removes any remaining 19 kHz and38 kHz signals.

The right channel then goes through U2, which is afixed delay buffer amplifier. The left channel goes throughvariable delay buffer amplifier U4. Potentiometer R35 is thevariable delay and is used to adjust signal phase. It is used tomaximize the Stereo Decoder's stereo separation and compensatefor any delays that might be encountered.

The right channel then goes into U3, 1/2 of which isused for a non -inverting output; the other 1/2 is used for aninverting output. The level of both inverting and non -invertingamplifiers is controlled by R21, the gain control potentiometer.The left channel operates in the same manner using U5. R34 isthe left channel's output level adjustment potentiometer.

The left channel "+" output is J8, pin 8 and the "-"output is J8, pin 7. The right channel "+" output is J8, pin 10and the "-" output is pin 9. In the 7707, the Stereo Boardconnector is J9.

Located on the PC board is a light emitting diode, DS1.This LED indicates the reception of a 19 kHz tone and turns onwhen a stereo signal is being received.

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P/N 5004-8300Rev. AJuly 8, 1989Equipment Serial No.Shipping Date

PART G

OPERATION MANUAL

IF REPEATER OPTION



Part GIF Repeater OptionTable of Contents

SECTION G1 GENERAL INFORMATIONG1.1 General Description G1-1

SECTION G2 INSTALLATIONG2.1 Unpacking and Inspection G2-1G2.2 Installation and Connections G2-1

SECTION G3 THEORY OF OPERATIONG3.1 IF Repeater Theory of Operation G3-1

SECTION G DIAGRAMS

Figure G1 IF Repeater, Schematic 6601-3711Figure G2 IF Repeater, PCB Assy. 6608-3711

SECTION 1GENERAL INFORMATION

G1.1 General Description

The TFT IF Repeater is used in repeating applicationswhen a repeating site is required to link the RF signal from thestudio or originating point to the broadcast transmitter. The IFRepeater eliminates the need for demodulating, then remodulatingthe RF signal. This demodulating/modulating process causes non -linearity and some signal degradation.

TFT uses the frequency translation method to ensure that aclean RF signal is relayed to the next site. The repeating 8301BReceiver takes a 10.7 MHz and mixes it with a 73.7 MHz L.O. Thissignal is then filtered and a 63 MHz IF is derived for use withthe repeater transmitter. When the 8300 Transmitter is used in arepeater configuration, the program modulator and synthesizer areremoved from the signal path and replaced by the 63 MHz IFderived from the IF Repeater in the 8301B Receiver.

SECTION 2INSTALLATION

G2.1 Unpacking and Inspection

Upon receiving the 8301B Receiver with the IF Repeateroption, inspect the packing box and instrument for signs ofpossible shipping damage. If the instrument is damaged or failsto operate properly due to transportation damage, file a claimwith the transportation company or, if insured separately, withthe insurance company.

G2.2 Installation

When purchased with 8301B Receiver, the IF Repeater isinstalled on the casting, is calibrated, and is ready forimmediate use with the repeater transmitter. There is noadjustment needed. To use the IF Repeater option, connect the8301B repeater receiver and the repeater transmitter in thefollowing manner:

a. Turn off ac power to the receiver and transmitter.

b. Connect a coaxial cable from the IF OUTPUT (63MHZ) BNC connector (63 MHz, approximately +2 dBm)on the rear panel of the 8301B repeater receiverto the IF INPUT (63 MHZ) BNC connector on the rearpanel of the 8300 repeater transmitter.

c. Connect J5, pin 11 (AGC EN) on the rear panel ofthe 8301B repeater receiver to the REMOTEconnector, pin D, on the rear panel of therepeater transmitter.

The IF Repeater is now ready for use in a repeater configuration.

SECTION 3THEORY OF OPERATION

G3.1 IF Repeater Theory of Operation

The 10.7 MHz IF input comes to the IF Repeater Boardfrom the IF Board in the 8301B Receiver to Ll. From Ll the 10.7MHz passes to AGC amplifier Ui and then to mixer Z1 where it is

mixed with the 73.7 MHz L.O. from the 8301B IF Board. The duplexnetwork -- consisting of L4, C4, R4, R5, L5, and C5 -- screensout signals to get 63 MHz.

The 63 MHz is amplified at U2 and goes to the bandpassfilter consisting of L7, L8, L9, and associated components. Thisfilter rejects all unwanted signals. The resulting 63 MHz goesto amplifiers U3 and U4. At the output of U4 the R6, R7, and R8make up the 3 dB pad through which the 63 MHz signal passesbefore going out as the IF OUTPUT through the rear panelconnector on the 8301B. The output is approximately +2 dBm.

At U4, pin 7 the 63 MHz is also fed to the AGC circuit,which controls the gain of the 63 MHz amplifier circuit, viarectifier CR1. From CR1 the rectified dc goes to U6, pin 6.Here the level is compared with the reference at U6, pin 5. If

the levels are different, a voltage out of U6, pin 1 is generatedin order to control the AGC at amplifier Ul. This voltage pullsUl down until the levels at U6, pins 5 and 6 are equal.

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TABLE OF CONTENTS

PART A MODEL 8300 SERIES STL SYSTEM

PART B MODEL 8300 SERIES STL TRANSMITTER

PART C MODEL 7770 TRANSMITTER AUTOMATIC CHANGEOVER

PART D MODEL 8301B SERIES STL RECEIVER

PART E MODEL 7773 RECEIVER AUTOMATIC CHANGEOVER

PART F STEREO DECODER OPTION

P/N 5004-8300Rev FJune 13, 1988Equiment Serial No.Shipping Date

OPERATION MANUAL


PART A


P.O. Box 58088Santa Clara, CA 95052TEL (40) 727-7272TWX 910-338-0584

FAX (408) 727-5942

SECTION A

Model 8300 Series STL System

TABLE OF CONTENTS

Page

SECTION Al GENERAL INFORMATION A1-1

A1.1 System Description A1-1A1.2 Specifications A1-1A1.3 Warranty A1-3A1.4 Claim for Damage in Shipment A1-4

SECTION A2 INSTALLATION A2-1

A2.1 Unpacking and Inspection A2-1A2.2 Preinstallation Checkout A2-1

A2.2.1 Transmitter A2-1A2.2.2 Receiver A2-2A2.2.3 Transmitter Automatic Changeover (optional) A2-2A2.2.4 Receiver Automatic Changeover (optional) A2-3

A2.3 Installation and Connections A2-3

A2.3.1 Antenna Connections A2-3A2.3.2 Transmitter Audio A2-4A2.3.3 Receiver Audio A2-4A2.3.4 Transmitter Hot Standby Connections (Fig. 1) A2-4A2.3.5 Receiver Hot Standby Connections (Fig. 2) A2-5

SECTION A3 OPERATION A3-1

A3.1 General A3-1A3.2 Controls, Connectors, and Indicators A3-1

A3.2.1 Transmitter Front Panel (Fig. 3) A3-1A3.2.2 Transmitter Rear Panel (Fig. 4) A3-2A3.2.3 Receiver Front Panel (Fig. 5) A3-3A3.2.4 Receiver Rear Panel (Fig. 6) A3-4A3.2.5 Transmitter Automatic Changeover Unit

Front Panel (Fig. 7) A3-5A3.2.6 Transmitter Automatic Changeover Unit

Rear Panel (Fig. 8) A3-5A3.2.7 Model 7773 Receiver Automatic Changeover

Unit Front Panel (Fig. 9) A3-6A3.2.8 Receiver Automatic Changeover Unit

Rear Panel (Fig. 10) A3-6

TABLE OF CONTENTS (Continued) Page

SECTION A3 OPERATION (Continued) A3-7

A3.3 Transmitter Modulation Operating Levels A3-7

A3.3.1 Composite A3-7A3.3.2 Subcarrier A3-7

SECTION A4 SYSTEM MAINTENANCE A4-1

A4.1 General A4-1A4.2 Access A4-1A4.3 Periodic Maintenance A4-1

SECTION A5 ALIGNMENT PROCEDURES A5-1

A5.1 Test Equipment A5-1A5.2 Alignment Procedures A5-1

A5.2.1 STL Frequency Alignment A5-3A5.2.2 Receiver Sensitivity A5-5A5.2.3 Xmtr Deviation and

Rcvr Output Level Calibration A5-7A5.2.4 Ultimate Signal to Noise Ratio A5-13A5.2.5 Stereo Separation and

Stereo Signal to Noise Ratio A5-16A5.2.6 Stereo Crosstalk A5-20

A5.3 Module Adjustments A5-24

SECTION A

GENERAL INFORMATION

A1.1 System Description

The TFT Model 8300 Studio Transmitter Link (STL) Systemprovides a more reliable method than conventional telephone lines fortransferring program material from a studio site to a station broadcasttransmitter. The STL system makes it possible to transmit a composite FMstereo signal, consisting of a main and stereo signal, plus two subcarriersover only one link. The subcarriers can be used for secondary program materialor remote control signals.

Excellent signal-to-noise ratio, low distortion, and highfrequency stability are achieved in the 8300 Series Transmitters by the use ofdirect FM modulation and phase -locked loop (PLL) carrier frequency synthesis.To these qualities the 8300 Series Receivers add high signal selectivity, highgain with low noise, and a unique pulse-counting discriminator circuit whichprovides excellent phase -linear characteristics for better stereo separationand lower crosstalk than more conventional methods. All receivers are crystalfequency controlled superheterodyne units.

An optional Hot Standby system is available for bothtransmitter and receiver. These systems automatically switch to an alternatestandby unit if the primary unit fails, assuring a secure and reliable linkfrom studio to transmitter.

For a Hot Standby system, the Model 7770 TransmitterAutomatic Switchover unit can be used with any of the STL transmitters, and theModel 7773 Receiver Automatic Switchover unit can be used with any of thereceivers.

For further information regarding individual components inthe system, refer to the following sections:

Section B 8300 TransmitterC 7770 Auto Switchover (Transmitter)D 8301 ReceiverE 7773 Auto Switchover (Receiver)

A1.2 SpecificationsSYSTEMFrequency Range 940-960 MHz standard

Other frequencies available on request

A1-1

Frequency Response

Distortion (THD & IMD)

Stereo Separation

Stereophonic Subchannel toMain Channel Crosstalk

Main Channel to StereophonicSubchannel Crosstalk


TRANSMITTERRF Power Output

RF Output Connector

Deviation for 100%Modulation

Frequency Stability

Spurious and Harmonicemission


Modulation Inputs

Power Source


RECEIVERRF Input Connector

Sensitivity

+.1 dB or better 30Hz to 53 kHz+.3 dB or better 53 to 75 kHz

0.2% or less 30 Hz to 53 kHz(Typically less than 0.1% at 1 kHz)

50dB or better, 50 Hz to 15 kHz(typically 55 dB or better); 45 dBwith narrow IF.

50 dB or better

50 dB or better

75 dB or better below 100% modulationde-emphasized left or right

4 Watts minimum; 10-14 Watts maximum


+50 kHz

Better than .0001%, 0°C to 50°C

60 dB or more below carrier level

One Stereo Composite Program and TwoSubcarrier Channels

Composite: 3.5V peak -to -peak, 10K ohmsbalanced and unbalanced, BNC and terminalstrip. 1 and 2. Multiplex: 1.5V peak topeak, 10K ohms BNC, (2 each), frequencyrange 130 to 300 kHz

115/230 VAC +10%, 50/60 Hz, 80 Watts24 VDC optional

One 3 1/2" analog meter for monitoringpower output, power supply, bias voltagesmultiplex and program modulation. LEDbargraph for monitoring 70 to 120% pro-gram channel modulation.

Type N Female, 50 ohm

40 uV or less required for 60 dB SNRbroadband, de-emphasized. 100 uV or lessrequired for 60 dB SNR left or right charnel demodulated.

A1-2

Selectivity (wide) 3 dB IF bandwidth +200 kHz60 dB IF bandwidth +700 kHz80 dB IF bandwidth +1.2 MHz

Selectivity (narrow) 3 dB IF bandwidth +150 kHz60 dB IF bandwidth +500 kHz80 dB IF bandwidth +1.2 MHz

Modulation Outputs Composite: 3.5V peak -to -peak, 75 ohm balancedand unbalanced, BNC and clip lead.Multiplex: 1.5V peak -to -peak, 75 ohm BNC andterminal strip barrier.

Power Source 115/230 VAC + 10%, 50/60 Hz, 10 watts, 24 VDCootional

Monitorina Capability One 3-1/2" analog meter for monitoring powersupplies, 0 to 120% modulation for program andmultiplex channels. LED bargraph for moni-toring input RF level and modulation 70 to120%.

A1.3 Warranty

TFT, Inc. warrants each of the instruments of itsmanufacture to be produced to meet the specifications delivered to the BUYER;and to be free from defects in material and workmanship. TFT will repair orreplace at its option, for a period of one year (two years for STL's) from thedate of delivery of equipment, any Parts that are defective from faultymaterial or workmanship.

Instruments found to be defective during the warrantyPeriod shall be returned to the factory with transportation charges nrepaid byBUYER. It is with respect to any nonconforming equipment and parts thereof andshall be in lieu of any other remedy available by apnlicable law. All returnsto the factory must be authorized by the SELLER, before such returns. Uponexamination by the factory, if the instrument is found to be defective, theunit will be repaired and returned to the BUYER, with transportation chargesprepaid by SELLER.

Transportation charges for instruments found to bedefective within the first thirty (30) days of the warranty period will be paidboth ways by the SELLER.

Transportation charges of warranty returns, wherein failureis found not to be the fault of the SELLER, will be paid both ways by theBUYER.

NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. TFT IS NOTLIABLE FOR CONSEOUENTIAL DAMAGES.

A1-3

A1.4 Claim for Damage in Shipment

Your instrument should be inspected and tested as soon asit is received. The instrument is insured for delivery. If the instrument isdamaged in any way, file a claim with the carrier or, if insured separately,with the insurance company.

WE SINCERELY PLEBE OUR IMMEDIATE ANP FULLEST COOPERATIoNTO ALL USERS OF OUR PRECISION ELECTRONIC INSTRUMENTS.

PLEASE ADVISE US IF WE CAN ASSIST YOU IN ANY MANNER.

TFT, Inc.

3090 Oakmead Villacie Drive

Santa Clara, CA 95051

(408) 727-7272 TUX 910-338-0584

A1-4

SECTION A2

INSTALLATION

A2.1 Unpacking and Inspection

Upon receiving the equipment, inspect the packing box andequipment for signs of possible shipping damage. Keep all packing materialuntil performance is confirmed. If any of the equipment is damaged or missing,file a claim with the transportation company, or with the insurance company ifinsured separately.

A2.2 Preinstallation Checkout

Test the total system -- that is, the STL, the subcarriergenerators, and demodulator -- on a back-to-back basis before installing thesystem in its final location. This is important to assure that all equipmentinterfaces properly before installation.

CAUTION

Do not connect the transmitter antennaoutput directly to the receiver antennainput. Doing so will destroy the receiverpreamplifier.

For back-to-back testing, set the transmitter and receivernext to each other. Terminate the transmitter output in a 50 -ohm load ofappropriate wattage (see transmitter specifications in Section B1 of Part B ofthis manual). Place a wire approximately 12 inches long in the receiverantenna input. The receiver signal level, as indicated on the receiver meter,should be approximately 100% of full scale when the transmitter is turned on(step 8 of subsection A2.2.1).

To ensure that the transmitter and receiver function as asystem, we recommend the following checkout plan before installation.

A2.2.1 Transmitter

CAUTION

The transmitter must be separated from anyheat producing equipment by at least 1-3/4inches of vertical rack space on top andbottom.

A2-1

1. Place the RF POWER ON switch on the STANDBY position.

2. Set the Line Power Input switch -connector (located on therear of the chassis) to the correct line voltage foravailable AC service (that is, 120V AC or 240V AC).

3. Connect the line cord to the AC power source. The SYSTEMUNLOCKED indicator should extinguish within 60 secondsafter AC power is applied.

NOTE

Switches called out in steps 4 through 12 below are locatedon the front panel. Record the readings observed in thesesteps for future comparison when testing equipment.

4. Press the INT T P meter switch. The meter should indicatebetween 3.5 and 5.5 volts on the VOLT scale. The INT T Pis factory set to read the VCO/Modulator Loop voltage.

5. Press the -12 VOLT meter switch. The meter should indicatebvetween 11 and 12.5 volts on the VOLT scale.

6. Place the RF POWER ON switch in the RF POWER ON position.

7. Press the FWD PWR meter switch. The meter should indicateapproximately 12 watts on the WATT scale.

8. Press the REV PWR meter switch. The meter should indicatenear 0 watts on the WATT scale.

9. Press the MUX 1 and then 2 meter switches. Withoutmultiplex input signals, the meter should indicate 0 on thetop scale in both positions.

10. Press the PRGM SIG meter switch. Without program inputsignals, the meter should indicate 0 on the top scale.

A2.2.2 Receiver

The receiver requires no preinstallation tests. Set theline power input switch -connector on the rear of the chassis for the correctline voltage for available AC service (that is, 120V AC or 240V AC).

A2.2.3 Transmitter Automatic Changeover (Optional)

The transmitter automatic changeover requires no pre -

installation tests. Set the line power input switch -connector located on therear of the chassis for the correct line voltage for available AC service (thatis, 120V AC or 240V AC).

A2-2

A2.2.4 Receiver Automatic Changeover (Optional)

No preinstallation testing is required.

A2.3 Installation and Connection

A2.3.1 Antenna Connections

The attenuation (RF loss) between the transmitter RF outputand the receiver RF input are of prime importance and need careful attention.The transmitting and receiving antennas should be placed at heights that allowreasonable path clearance. Generally, vertical polarization is used; buteither polarization may be used, provided both antennas have the same polarity.

To avoid damage to the transmission line -- one of the mostcommon problems encountered during STL installation -- take care not to twistor bend the lines to ensure that they retain their characteristic impedance. Adamaged line will cause poor system performance.

If the reverse power (as indicated on the transmittermeter) is high, the RF transmission line, the associated connectors, or theantenna may be at fault. After securing the connectors, have them treated toprevent exposure to moisture. A weatherproofing kit is recommended. Also,ground the line at various points as recommended for the particular cableselected.

For an STL antenna that is to be mounted on an AM antennatower (which is typically insulated from ground), install an isocoupler wherethe line begins its run up the tower. This isocoupler will pass the STL signalefficiently while providing a high impedance to ground for the tower at the AMfrequency.

More information on antenna installation and path loss canbe found in TFT publication "Studio Transmitter Link Applications Guide."

The losses in the antenna transmission line (coaxial cable)used to interconnect the receiver or transmitter to its antenna must be deter-mined and kept to a minimum. Where long runs of line are needed, proper STLperformance requires the use of a low -loss coaxial cable, available from TFT.

For best performance, it is recommended that the TFT PTL-1Accessory Kit with Connector Kit CON -1 or CON -2 (depending on antennainstalled) be used for antenna feedlines. Each STL system requires two PTL-iAccessory Kits and one CON -1 or one CON -2 Connector Kit. A PTL-1 kit consistsof an N -type coaxial connector for installation assembly of FG-8/U coax. TheCON -1 is a connector kit for LDF4-50 Heliax, and consists of two type L44Nfemale connectors. The CON -2 connector kit is for LDF-50 Heliax, and containstwo type L45N female connectors.

A2-3

A2.3.2 Transmitter Audio and Multiplex Connections

The output of the stereo source is applied to the input ofa pair of frequency selective audio limiters, as shown in Figure A2-1. Thelimited signals are then applied to a stereo generator, with a composite inputof the transmitter. The "-" side of the balanced input must be tied to groundto operate in the composite mode. The transmitter is set to use multiplexchannel 1 for the secondary program source with 0.53 V RMS equal to +12 kHzdeviation. Multiplex channel 2 is set for 0.53 V RMS equal to +12 kl7zdeviation.

A2.3.3 Receiver Audio and Multiplex Connections

For a composite stereo system, the STL composite receiverat the remote site is connected as shown in Figure A2-4. The composite outputfrom the receiver is connected directly to the wideband (composite) input ofthe FM exciter. The multiplex outputs are connected to their respective sub -

carrier demodulators for secondary programming or remote control demodulation.The receiver program, multiplex 1, and multiplex 2 outputs can be taken fromrear -panel multipin connector J5 or from the individual PGM (J2), MUX-1 (J3),and MUX-2 (J4) BNC connectors on the receiver rear panel.

A2.3.4 Transmitter Hot Standby Connections (Optional)

All necessary interconnecting control and RF cables aresupplied with the optional Model 7770 Transmitter Automatic Changeover forconnecting it to two STL transmitters. Refer to the Interconnecting BlockDiagram, Figure A2-6.

Select which STL transmitter will be used as TransmitterNo. 1 and which will be Transmitter No. 2. Connect one gray control cable fromthe Transmitter No. 1 rear -panel REMOTE connector to the Model 7770 rear -panelXMTR CTL 1 connector. The second gray control cable is then connected from theTransmitter No. 2 rear -panel REMOTE connector to the Model 7770 XMTR CTL 2connector.

Using a flexible cable such a FG-214 (Hard -Line may damagethe Automatic Changeover unit), connect the antenna feed line to the Model 7770ANT connector.

Connect one of the two black coaxial cables from the Trans-mitter No. 1 RF POWER OUTPUT connector to the Model 7770 XMTR 1 connector. OnTransmitter No. 2, connect the other black coaxial cable from TF POWER OUTPUTto the Model 7770 XMTR 2 connector.

The PROGRAM signal is a common input to both TransmitterNo. 1 and Transmitter No. 2 COMP INPUT connectors. These BNC inputs are con-nected together by coaxial or shielded cable through a BNC tee, UG 274A (notsupplied). Similarly, the MUX 1 input of Transmitter No. 1 is connectedthrough a UG274A BNC tee to MUX 1 Of Transmitter No. 2 and MUX 2 through a teeto MUX 2.

A2-4

A2.3.5 Receiver Hot Standby Connections (Optional)

All necessary interconnecting control and RF cables are

supplied with the optional Model 7773 Receiver Automatic Changeover unit for

connecting it to the two STL receivers. Make the connections shown in the

Interconnecting Block Diagram, Figure A2-7. Audio and multiplex connections

should be made in accordance with Figure A2-4 or Figure A2-5.

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A3.1 General

SECTION A3

OPERATION

This section explains the operation of the front -panelcontrol on all of the system equipment (subsection A3.2). It also discussesthe modulation level requirements for the transmitter (subsection A3.3).

NOTE

The transmitter and receiver are not equippedwith AC power switches. Whenever the units areconnected to an AC power source, the AC poweris on.

A3.2 Controls, Connectors, and Indicators

A3.2.1

Reference

1

2

3

4

5

RF POWER ON Switch andLED

REV PWR pushbuttonswitch

FWR PWR pushbuttonswitch

-12 SPLY

Transmitter Front Panel (Figure A3-1)

Name Function

SYSTEM UNLOCKED LED When lit, indicates a failure of thephase -locked loop (PLL) circuitry.

In the RF POWER ON position of the

switch, all circuits are energized andthe transmitter delivers power to theantenna. In the STANDBY position, poweris removed from the Driver. The LED inthe switch lights when the switch is in

the RF POWER ON position.

Selects RF power reflected from theantenna for monitoring on front -panel

Selects forward RF power to theantenna for monitoring on front -panelmeter.

Selects the -12 volt supply to bemonitored on the front panel meter.

A3-1

Reference Name Function

6 INT T P Selects the internal test point formonitoring on front panel meter. User

selectable positions are:

PA Supply

Output VCO LOOP VOLTAGEOutput VCO LEVEL1 watt Driver LevelSample PLL LEVELSample PLL LOOP VOLTAGEVCO MOD LEVELVCO MOD LOOP VOLTAGE

7

8

MUX 2

MUX 1

From the factory they are set to monitorthe VCO MOD LOOP VOLTAGE

Selects MUX 2 input signal formonitoring on front panel meter(100% = +12 kHz deviation)

Selects the combined MUX 1 and inputsignal (100% = +12 kHz deviation) formonitoring on fFont-panel meter.

9 PRGM SIG pushbutton Selects incoming program signal (100% =switch +50 kHz deviation) for monitoring on

Tront-panel meter.

10 Meter Indicates the voltage or signal levelselected by the pushbuttons.

11 Bargraph Display Displays 70% to 120% modulation on PRGMinput.

12 RF PWR ADJUST Adjusts power supply voltage to P.A. tovary RF Power Output.

A3.2.2

Reference

Transmitter Rear Panel (Figure A3-2)

Name Function

1 BALANCED INPUT terminal Provides input connections for balancedstrip line. (Input impedance = 10K ohms).

2 MUX 1 INPUT connector Provides input connection for telemetryor SCA. (Input impedance = 10K onms).


A3-2


4 COMP INPUT connector Provides input connection for compositesignal. When using this input, ground"-" terminal of BALANCED INPUT terminalstrip.

5 REMOTE connector Used to connect transmitter to Model7773 Transmitter Automatic Changeoverunit.

6 AC power connector Connects transmitter to power source.

7 Fuse Power line fuse SLO BLO (120V at 1A;240V at 1/2A) for Model 8300.

8 RF POWER OUT connector Provides RF output to antenna. Type Nfemale connector. Output impedance = 50ohms.

A3.2.3

Reference

Receiver Front Panel (Figure A3-3)

Name Function

1

2

+12V pushbutton switch

-12V pushbutton switch

Selects +12V output of power supply formonitoring on front -panel meter.

Selects -12V output of power supply formonitoring on front -panel meter.

3 +5V pushbutton switch Selects +5V output of power supply formonitoring on front -panel meter.

4 PGM pushbutton switch Selects program audio for monitoring onfront -panel meter.

5 MUX-1 pushbutton switch Selects the MUX-1 signal for monitoringon front -panel meter.

6 MUX-2 pushbutton switch Selects the MUX-2 signal for monitoringon front -panel meter.

7 Meter Indicates the voltage or signal levelselected by the pushbuttons.

8 Bargraph Display Indicates modulation levels between 70and 100%.

A3-3


9 RF Level Display Indicates relative RF level of inputsignal.

10 Narrow/Wide IF switch Selects IF Bandwidth.

11 Hi/Lo Gain Switches a 10dB attn into amp for hi RF

level environment.

A3.2.4 Receiver Rear Panel (Figure D3-4)


1 ANT INPUT connector J1 Used to connect cable from antenna ifsingle receiver is being used; used toconnect cable from Receiver AutomaticChangeover unit if Hot Standby system isbeing used.

2 PGM connector J2 (BNC) Provides main program channel audio

output.

3 MUX-1 connector J3 (BNC) Provides secondary program subcarrieroutput.

4

5

MUX-2 connector J4 (BNC) Provides control subcarrier output.

AUDIO INPUT/OUTPUTconnector J5

Provides same program and multiplexoutputs as J2, J3, and J4. Also

provides AGC and -PGM for balancedoutput

6 AUTO CHANGEOVER 7773 Provides +12V, -12V, and squelch for

connector J6 monitoring by the Receiver AutomaticChangeover unit. Also brings in controlsignal from Receiver AutomaticChangeover unit.

7 Fuse Power line fuse SLO BLO (120V at 1/4A;240V at 1/8A).

8 Chassis GND

A3-4

A3.2.5

Reference

Transmitter Automatic Changeover Unit Front Panel(Figure A3-5)

FunctionName

1

2

XMTR TEST 1 pushbuttonswitch

XMTR TEST 2 pushbutton

Tests the automatic changeover functionand Transmitter No. 1.

Tests the automatic changeover functionswitch and Transmitter No. 2.

3 XMTR ON 1 pushbutton Locks Transmitter No. 1 in the transmit

switch mode.

4 XMTR ON 2 pushbutton Locks Transmitter No. 2 in the transmitswitch mode.

5 AUTO pushbutton switch Puts the Transmitter AutomaticChangeover unit in the automatic mode.

6 XMTR 1 RADIATE LED Indicate that Transmitter Na. 1 is

radiating.

7 XMTR 2 RADIATE LED Indicates that Transmitter No. 2 is

radiating.

8 AC POWER LED AC line power is on.

A3.2.6

Reference

Transmitter Automatic Changeover Unit Rear Panel(Figure A3-6)

FunctionName

1 Power line cord Supplies 120/240V AC line power.

2 Fuse 1/2A, 120V AC; 1/4A, 240V AC.

3 XMTR 1 connector Used to connect RF input fromTransmitter No. 1.

4 ANT connector Provides RF output to antenna.

5 XMTR 2 connector Used to connect RF input fromTransmitter No. 2

6 STATUS terminal strip Provides output for controlling externalalarm; 50V, 250 mA maximum.

7 XMTR CTL 1 connector Provides input and output controlsignals to Transmitter No. 1

A3-5

f


8 XMTR CTL 2 connector Provides input and output controlsignals to Transmitter No. 2.

A3.2.7 Receiver Automatic Changeover Unit Front Panel

(Figure A3-7


1 RxA lamp This green LED lights when Receiver A isdelivering the audio output to the

station transmitter.

2 Rotary switch In the RXA position, this switch selectsReceiver A to provide the audio outputto the station transmitter, unlessReceiver A's power supply is inopera-tive, in which case Receiver B willprovide the audio output. In the AUTOposition, the receiver previouslyselected manually will supply the audiooutput; but the other receiver will beautomatically selected if the RF signallevel or power supply voltages fail in

the manually selected receiver. In theRXB position, Receiver B will be manual-ly selected with the same exceptioncited above for the RXA position.

3 RxB lamp This green LED lights when Receiver B isdelivering the audio output to thestation transmitter.

A3.2.8

Reference

Receiver Automatic Changeover Unit Rear Panel

(Figure A3-8)

FunctionName

1 RXA multipin connector Used to connect the Receiver AutomaticChangeover unit to Receiver A.

2 RXB multipin connector Used to connect the Receiver AutomaticChangeover unit to Receiver B.

3 ANT connector Connects the Receiver AutomaticChangeover unit to the antenna.

4 RXB connector (BNC) Connects the antenna to Receiver B.

A3-6


5 RXA connector (BNC) Connects the antenna to Receiver A.

A3.3 Transmitter Modulation Operating Levels

A3.3.1 Composite

The level required to modulate the composite input on acomposite transmitter is 1.24V RMS (3.5V p -p) into 10K ohms unbalanced. The

audio inputs of the stereo generator should be limited using a frequency

selective limiter, to be set up according to manufacturer's specification.

A3.3.2 Subcarrier

The two multiplex inputs on the 8300 Series Transmitters

are provided for secondary programming and control subcarriers' input

(injection). The program material and/or control tones are applied to theinput of the subcarrier generator or generators at the studio. The output fromthe subcarrier generator or generators is applied to the multiplex input of thetransmitter. The input sensitivity is factory calibrated for +12 kHz (100%modulation on meter) subcarrier frequency deviation. It requires 0.5 vrms to

produce 100% modulation. If two multiplex signals are used, each signal shouldbe calibrated to read 50% on the front panel meter by adjusting the outputlevel of the generatar.

The multiplex carriers from the transmitter for demodu-lation are filtered out from the program signals. If two carriers are used,they will come out simultaneously from the 140 - 220 kHz band pass filter. Thesubcarrier demod must be equipped with additional band pass filters to separatethe two carriers.

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SECTION A4

SYSTEM MAINTENANCE

A4.1 General

Once installed, the TFT Series 8300 Studio Transmitter Link

should require little maintenance. The units should be installed away fromvacuum tubes and other heat generating equipment, and the STL Transmittershould be provided with adequate ventilation for its rear -panel heat sink.

A4.2 Access

Circuit assemblies and top -of -chassis components in all STLunits are accessible by removing the top cover of the unit.

A4.3 Periodic Maintenance

Once the STL is installed, the only maintenance necessaryis a periodic proof of performance check of the system to be assured of optimum

operation.

The performance of the STL Transmitter and Receiver units

can be easily and quickly checked at the front panel meter. Followinginstallation of the STL system, the meter readings for each position of themeter selector switch should be recorded. This gives a quick and accuratecheck of system performance by allowing a comparison of operation at a later

date to its operation when new. Gradually changing readings can be quicklyspotted by this method, and used to forestall developing problems.

When comparing receiver data, consideration must be givento environmental conditions at the time of the reading. Weather conditions or

a temperature inversion could cause transmission path fade margins to bereduced, and meter readings might not be indicative of true system performance.

A4-1

SECTION A5

ALIGNMENT PROCEDURES

A5 Introduction

This section presents the alignment procedures for the 8300System and a list of recommended test equipment. Also included aredescriptions of all module adjustments, general troubleshooting information,and test fixture diagrams. Relevant troubleshooting information is included atthe end of each alignment procedure.

A5.1 Test Equipment

Table A5-1.1 lists the test equipment recommended for usein the alignment procedures. Equivalent items of test equipment may also beused.

A5.2 Alignment Procedures

The 8300 alignment procedures include the following:

1. STL frequency alignment.2. Receiver sensitivity3. Transmitter deviation, and receiver output

level calibration.4. Ultimate signal-to-noise ratio.5. Distortion alignment.6. Stereo separation, and signal-to-noise ratio.7. Stereo crosstalk.

A5-1

InstrumentType

TABLE A5-1.1 Recommeded test equipment

SuggestedModel

Critical

Specification

COUNTER

DIRECTIONALCOUPLER

ATTENUATOR,50 -OHM LOAD

ATTENUATOR,

ADJUSTABLE

RF SIGNAL

GENERATOR

DISTORTIONMEASUREMENTSET

AUDIO

OSCILLATOR

RF SPECTRUMANALYZER

Tektronix

DC -508A

1.3 GHz Counter

Note: For dual links onsame frequency, includeOption 01.

Microlab/FXRModel CB -49B

Philco 662A-30or Sierra 661-A-30

Kay ElemetricsModel 432D

Hewlett-PackardModel 8640B withOption 01 & 02

Hewlett-PackardModel 339Aor

Tektronix AA501with SG505 andTM503 Main Frame

Hewlett-Packard204C

Hewlett-PackardModel 8559A with181T display

A5-2

Single Link

+5 PPm

Dual Link+.2 ppm

30 dB

1.0 - 2.0 GHz

50 ohms30 dB

50 ohms

1,2,3,5,10 & 20 dB steps

Freq. Range: .5 MHz to 1024 MHzResidual FM:

<30 Hz, 20 Hz to 15 kHz<10 Hz, 300 Hz to 3 kHz

Output Level Accuracy:+3.5 dB -7 to -47 dB74.0 dB -47 to -137 dB

Output Impedance: 50 ohmsFM Deviation Bandwidth: dc to 250 kHz

Distortion Measurement

Residual Noise: (80 kHz) -92 dBInput Impedance: 100 k ohms shunted

by <100 pFVoltmeter

Accuracy: 20 Hz to 20 kHz +2%10 Hz to 110 kHi-+4%

Oscillator

Frequency Range: 10 Hz to 110 kHzOutput Level: >3 V rms into 600 ohmsDistortion: 10 Hz to 20 kHz

<-95 dB (.00187)THD

600 ohm output

frequency range 100 kHz to 200 kHz

Frequency Band: .01-3 GHzDynamic Range: .01 to 3 GHz >70 dBDisplay Range: Log 10 dB/div and

1 dB/div

Display Accuracy Log: less than 2 dBover full range

Input Impedance: 50 ohmsSWR: <1.3 dB >10 dB input attenuation

Instrument

Type

SuggestedModel

Critical

Specification

AUDIOSPECTRUM

ANALYZER

POWER METER

AND SENSOR

STEREOGENERATOR

TektronixModel 7L5 with

Option 25 and L3Plug-in7603 Main Frame

Hewlett-PackardModel 435A with

Model 8481A PowerSensor

C.N. Rood Model 203

STEREO TFT 724A

DEMODULATOR

OSCILLOSCOPE TektronixModel 465

MULTIMETER

75,os

DE -EMPHASIS

NETWORK

Data PrecisionModel 238

Figure A5-2

Input Impedance: 1M ohms/28 pfInput Frequency: 10 Hz to <500 kHzDisplay Range: 80 dB, log 10 dB/div

Accuracy: +1% of full scalePower Range: -25 dBm (100 mW) full

scale

Stereo SNR: 75 dBSeparation: 55 dBTHD: 0.1% or less

Stereo SNR: 75 dB

Separation: 55 dBTHD: 0.5% or less

Bandwidth: 75 MHz

A5.2.1 STL Frequency Alignment

Specifications+.0001%, 0° to 50° C (450 Hz at 950 MHz)7500 Hz at 25° C (77° F)

Description[he S1L: frequency is aligned by using a counter to measure the

transmitter ouput frequency and the receiver first local oscillator frequency.A high -precision counter (+0.2 ppm) is recommended to align STL links that areused in a redundant instalTation. If such a counter is not available, werecommend that both STL systems be aligned at the same time using the the samecounter. A difference greater than 2 kHz between the STL transmitter centerfrequency and receiver center frequency will result in degradation of toedistortion, separation, and crosstalk performance.

A5-3

TRANSMITTER

COUNTER

-. .

DIRECTIONAL I--1 ATTENUATOR

COUPLER

(RF OUT)

(LO -1 OUT)

RECEIVER

CAUTION: Place the transmitter RF POWER switch in STANDBYuntil the coupler and attenuator are connected.

Figure A5-1. Test setup for frequency alignment.

Test EquipmentName

CounterDirectional CouplerAttenuator, Load

Maufacturer

TektronixMicrolabPhilco

Model

EC -508A with Option 01FXR CB -49N662A-30

ProcedureI. Connect the equipment as shown in Figure A5-1.2. Position the transmitter RF POWER switch to the ON position.

Using the METER FUNCTION switch, select the FWD POWERposition. Verify that the front panel meter reads between 10and 14 watts on the watts scale.

3. Check the serial number label on the back of the STLtransmitter for its operating center frequency. The countershould indicate the frequency within 2 kHz of the specifiedcenter frequency. If it does not, proceed to thetroubleshooting portion of this procedure and verify that theSampling Phase Lock Loop and VCO/Modulator are operating attheir specified frequencies.

4. While monitoring the counter, adjust the transmitter First LOfrequency adjustment for a reading of the specifiedtransmitter frequency +200 Hz.

5. Calculate the receiver First LO frequency by subtracting 63MHz from the frequency specified on the serial number label atthe back of the 8301 Receiver.

6. Connect a frequency counter to the output of the receiverFirst LO. The counter should indicate a frequency within+2 kHz of the frequency calculated in Step 5. If it does not,proceed to the troubleshooting portion of this procedure.

7. Using the counter, adjust the reciever First LO frequencyadjustment for a reading within +200 Hz of the frequencycalculated in Step 5.

A5-4

Note: If two STL systmes are installed for redundant operation, both should

be aligned for frequency at the same time.

Troubleshooting

1. The crystal in the transmitter Sampling Phase Lock Loop should

be 87.650 MHz.2. The crystal frequency of the Reciever First LO should be

FrMHz- 63MHz

10

3. If the First LO fails to meet the +2 kHz specified in this

procedure, the crystal oven should-be checked to ensure thatit is operating at 70° C +5° C.

4. If the transmitter frequency fails to meet the +2 kHzspecified in this procedure and the sampling P.T.L. appears to

be operating to specification, the VCO/Modulator should be

checked to ensure that it is operating at its designedfrequency. The VCO/Mod frequency may be calculated as

follows:

VCO/Mod frequency = The transmitter center frequency minus

876.5 MHz.

The VCO/Mod frequency should be within +500 kHz of the value

calculted.

A5.2.2 Receiver Sensitivity

Specification:

30 uV, or less, for 60 dB SNR broadband, de-emphasized

150 uV, or less, for 60 dB SNR left or right channel demodulated stereo,

de-emphasized

Description:

The sensitivity of the 8301 STL Receiver is verified using a signal generator

and a de -emphasis network or a de-emphasized stereo demodulator.

RF SIGNAL GENERATOR

DISTORTION MEASUREMENTSRT DISTORTION

1

Ev_ IN

STEREODEMODULATOR

75 US[ DE -EMPHASIS

Figure A5-2. Sensitivity test setup.

ANT.

OUT./->x

RECEIVERCOMPOSITE

A5-5

Test Equipment:Name

RF Signal Generator75 Us De -emphasis Network

Stereo DemodulatorDistortion Measurement Set

ManufacturerHewlett-Packard(See Figure A5-2)TFT

Hewlett-Packard

Model

HP -8640B

Model 724AHP -339A

Procedure:1. Connect the equipment as shown in Figure A5-2, and set the

controls on the signal generator as follows:

Meter LevelAM ModulationFM Deviation

Range MHzFrequency Tuned

Output LevelRF

VoltsOffOff

1024/512Tuned to frequency indicated on serialnumber label on back of STL receiver.-40

On

Adjust the output level on the signal generator for a reading of3 mV on the signal generator meter.Using the RF Level LEDS on the 8301 Receiver, verify that themeter reads 3 mV.While monitoring the RF Level LEDS of the receiver, switch theOUTPUT LEVEL ADJ on the signal generator from -40 to -110 andverify that the signal strength reads within the meter range foreach setting. If it does not, proceed to paragraph A4.4.4, 63MHz to 850 kHz, prior to continuing the test, and perform thecalibration adjustments given there.

4. Using the METER FUNCTION switch on the receiver, select the PGMLEVEL position.

Set the FM Deviation on the RF signal generator to ON.

Set the modulation frequency on the signal generator to 400 Hz.

Adjust the deviation control on the signal gerator so that themeter of the STL receiver reads 0 dB on the top scale. Verifythat the deviation on the signal generator reads +50 KHz.

5. Set the controls on the distortion measurement set for a 0 dBreference.

Set the FM Deviation on the RF signal generator to OFF.

Position the controls on the distortion measurement set for areading of 60 dB SNR.

Reduce the RF LEVEL adjustment on the RF signal generator untilthe distortion measurement set reads 60 dB.

Observe the RF level output of the signal generator; it shouldindicate less than 150 uV.

A5-6

6. Set the controls on the distortion measurement set for asignal-to-noise ratio of 40 dB.

Reduce the RF level on the signal generator until the mute

threshold is reached. Observe the RF level output of the signalgenerator; it should indicate less than 22 uV. Then set the RF

level output of the signal generator to 30 uV and adjust the MUTE

THRESHOLD ADJ until the mute threshold pot for muting.

Note: This completes the testing for sensitivity if the STL

receiver is used in a composite link.

7. Broadband De-emphasized SNR

Replace the stereo demodulator with a 75 Us de -emphasis network.

(see Figure A8-16.) Repeat the above steps 1 through 6 with the

following exception:

The specification for 60 dB signal-to-noise ratio is 30 uV, or

less.

Troubleshooting:

1. The cable between the RF signal generator and the STL receiver

should be kept at a minimum to reduce insertion loss. As an

example, a 3 -foot cable (RG-58) will cause a 1 dB or 10% loss in

signal.2. Prior to troubleshooting, verify that the RF GAIN SWITCH on 8301

Front Panel is in the out position.3. Verify the RF gain distribution of the 8301 Receiver on the

schematic diagrams.

A5.2.3 Transmitter Deviation, and Receiver Output Level Calibration

Specification:Transmitter: 1.24 Vrms composite input equals +50 kHz

deviation..54 Vrms MUX 1 equals +12 kHz deviation..54 Vrms MUX 2 equals +12 kHz deviation.

Receiver: Composite output equalT 1.24 Vrms with 50 kHzdeviation (30 Hz - 75 kHz).

MUX output equals .54 Vrms for +12 kHzdeviation (130 kHz - 190 kHz).

DescriptionThe deviation and modulation sensitivity of the composite information

is aligned using a Bessel null function as a reference. The MUX channel is

aligned using an RF generator as a reference.

A5-7

(RF OUT)

DIRECTIONAL'TRANSMITTER COUPLER

COMPOSITEI--

ATTENUATOR

DIST. MEASUREMENT SET

DIST. AUDIOIN IM

50HzFILTER

COUNTER

*

ATTENUATOR

SPECTRUMANALYZER

RECEIVER

ANT.

COMPOSITEOUT

CAUTION: Place the transmitter RF Power switch in STANDBY until

the coupler and attenuator are connected.*CAUTION: To avoid receiver damage, initially set

attenuator for maximum attenuation.

Figure A5-3. Test setup for deviation alignment.

Test EquipmentCounterDirectional CouplerAttenuator, 50 ohm LoadAttenuator, AdjustableRF Signal GeneratorDistortion Measurement

Set

Audio OscillatorSpectrum Analyzer50 Hz FilterOscilloscope

Tektronix DC -508AMicrolab FXR CB49NPhilco 662A-30Kay Elemetrics 432DHP -86408

HP -339A

HP -204C

HP -8559A

(See Figure A4-15)Tektronix T932A

Procedure1. Connect the equipment as shown in Figure A5-3.2. Adjust the audio oscillator of the distortion measurement set for

an output voltage of 1.24 Vrms at 20.79 kHz as follows:a. Position the meter function switch to the oscillator level

position and adjust the oscillator level controls for a

reading of 1.24 Vrms on the meter.b. Using the counter to monitor the oscillator frequency,

position the frequency controls for a reading of 20.79 kHz.3. Position the STL trasmitter RF Power switch to the ON position.

Using the METER FUNCTION switch, select the FWD POWER positionand verify that the meter reads between 10 and 12 Watts.

4. Using the spectrum analyzer, monitor the modulated RF output ofthe STL transmitter. The controls of the spectrum analyzershould be in the following positions:

Frequency Band GHz 01-3

Time/DIV AutoTrigger Free runFREQ/SPAN/DIV 50 kHz/DIV with 3 kHz bandwidthInput ATTEN 30

REF Level -20

10 dB/DIV DepressTuning STL transmitter center frequency.

5. Disconnect the BNC connector from the composite input of thetransmitter and adjust the display on the spectrum analyzer sothat the waveform is at the top graticule (see Figure A4 -4A).

Reconnect the BNC connector to the composite audio input of theSTL transmitter. The display on the spectrum analyzer should besimilar to Figure A4 -4B.

Adjust PGM Level Adjust R23 on the Composite Audio Processormodule for a Bessel null function of at least -50 dB on thespectrum analyzer.

Using the METER FUNCTION switch on the STL transmitter, selectthe PGM LEVEL function. Adjust R23 on the STL transmitterMetering and Status board for a reading of 0 dB on the top scaleof the meter.

6. Using the METER FUNCTION switch on the STL receiver, select theRF LEVEL position.

Position the switches on the adjustable attenuator for an RFlevel reading between 1 mV and 3 mV on the receiver RFindicator.

Set the controls on the distortion measurement set as follows:

Meter Function Reference levelFrequency 1.0 kHzMeter Input Range +10 dB

1

1

II

1

11

r

i

t

(A)

(B)

Vert = 10 dB/DivHor = 50 kHz/div and

3 kHz bandwidth

All Li-

Figure A5-4. Bessel null function waveforms.

A5-10

With the oscillator output connected to the STL transmitter,connect the meter input in parallel with the oscillator outputand adjust the Relative Adjust for a 0 dB reference on the

distortion measurement set. Reconnect the distortion input to

the composite output of the STL receiver.

On the receiver MAIN BOARD, adjust Baseband Level Adjust R41 for a

reading of 0 dB on the distortion measurement set.

Using the receiver METER FUNCTION switch, select the PGM LEVELposition and adjust R54:on the Main board for a reading of 0 dB

on the to scale.

TRANSMITTER

MUX 2

MUX I

(RF OUT)

DIRECTIONALCOUPLER

RF SIGNALGENERATOR

LOADATTENUATOR

AUDIOOSCILLATOR

*

SWITCHABLE L_ATTENUATOR r-

i

SCOPE

CAUTION: Place the transmitter RF Powerswitch in STANDBY until the coupler andattenuator are connected.

*CAUTION: To avoid receiver damage, initialle setattenuator for maximum attenuation.

Figure A5-5. Test setup for MUX channel alignment

RECEIVERANT.

MUX

OUT

7. Position the STL transmitter RF Power switch to the STANDBY

position.

Connect the equipment as shown in Figure A4-5, and adjust thecontrols on the RF signal generator as follows:

Meter Function FM

AM Off

Modulation Frequency 110 kHz

FM INT

Peak Deviation 10 kHz

Range 1024/512 MHzOutput Level -40

RF On

:requency Tune to the frequency specified onserial number label of STL receiver.

Peak Deviation Adjust FM control for a meter readingof 12 kHz.

While monitoring the oscilloscope, adjust MUX Level Adjust R13 on

the STL receiver Filter/Amplifier Board module for a reading of

.54 Vrms.

Using the receiver METER FUNCTION switch, select the MUX LEVEL

position.

Meter should be indicating 100% on the "%" scale of the receiver

meter.8. On the RF signal generator, adjust the modulation frequency to

185 kHz and the FM deviation for 12 kHz.

Note the reading on the receiver meter. It should be between

100% and 102% on the "%" scale. This reading will be used as a

reference to align the transmitter MUX 2 deviation. Connect theoutput of the adjustable attenuator to the RF input of the STL

receiver.9. Position the STL transmitter RF Power switch to the ON position.

Using the scope, adjust the output of the audio oscillator for a

voltage of .54 Vrms, and a frequency of 152 kHz. Connect theaudio oscillator output to the MUX 1 input of the STL

transmitter.

Adjust R31 on the transmitter Meter board for a reading of 100%

on the meter.

Adjust the MUX 1 Level Adjust R32 on the transmitter Meter Board

for a reading of 100% on the receiver meter.

Using the transmitter METER RUNCTION switch, select the MUX LEVEL

position.

Connect the audio oscillator to the transmitter MUX 2 input andadjust the oscillator to a frequency of 185 kHz.

A5-12

Using the receiver meter as a reference, on the transmittermeter board, adjust MUX 2 Level Adjust R31 for the reading notedin paragraph. The meter reading on the transmitter front panelshould be between 90% and 102% on the scale.

Troubleshooting:

1. When aligning STL systems as a dual or redundant installation,

one STL transmitter should be used as a reference. In this case,the second STL transmitter would be aligned using the first STLreceiver as a reference. The second STL receiver would bealigned using the first STL transmitter as a reference. As afinal verification, the second STL transmitter would be checkedusing the second STL receiver. Using any combination oftransmitter and receiver, the composite band should be flatwithin +0.1 dB. The results from the multiplex band measurementsshould Fie within 10%.

2. The multiplexed output is lowest when the carrier centerfrequency of the transmitter and receiver are identical. Thisphenomenon is more pronounced when the STL receiver is in thenarrow I.F. mode.

A.5.2.4 Ultimate Signal -to Noise Ratio

Typical Values:

Ultimate or better75 Us de-emphasized 76 dB or better

A5-13

Description:

The STL ultimate wideband (50 Hz to 75 kHz) and 75 Usde-emphasized SNR are verified using a distortion measurementset. Stereo SNR is verified during the stereo separation test,and the STL receiver SNR (quieting) is verified during thereceiver sensitivity test.

TRANSMITTER

COMPOSITE

(RF OUT)

:, DIRECTIONAL LOAD Fd SWITCHABLECOUPLER I ATTENUATOR ATTENUATOR

*

DISTORTION MEASUREMENTSET AUDIO

DIST. IN ov OUT

CAUTION:

*CAUTION:

Figure A5.

Test Equipment:

Directional CouplerAttenuator, 500 LoadAttenuator, AdjustableDistortion Measurement Set50 Hz High Pass Filter

75 Us De -emphasis Metwork

75 USDE -EMPHASIS

50 HzFILTER

=

RECEIVERANT.

COMPOSITEOUT

Place the transmitter RF Powerswitch in STANDBY until the couplerand attenuator are connected.To avoid receiver damage, initiallyset attenuator for maximum attenuation.

Test setup for signal-to-noiseratio measurement.

Microlab/FXR CB -49NPhilco, 662A-30Kay Elemetrics Corp., 432DHewlett-Packard, HP -339A(see Figure A4-15)(see Figure A4-16)

Procedure:

1. Connect the equipment as shown in Figure A5-6, and set thecontrols on the distortion measurement set as follows:

Meter Function REF Level

Meter Input +10 dBmFrequency 400 Hz

2. Set the controls on the STL transmitter as follows:

RF Power ON

METER FUNCTION PGM LEVEL

3. Using the METER FUNCTION switch on the STL receiver, select thePGM LEVEL position.

4. Adjust the oscillator output level on the distortion measurementset for a reading o 0 dB on the top scale of the transmitter

meter.

Rotate the REFERENCE ADJUST on the distortion measurement set for

a 10 dB reference on its front -panel meter. Disconnect the

composite input at the STL transmitter rear panel.

Using the INPUT RANGE switch on the distortion measurement set,

measure the ultimate wideband SNR. (Note: The reference is +10

dB; hence, a meter input range indicating -60 and a meter reading

of -6 would indicate and SNR of -76 dB.)

5. Position the INPUT RANGE switch to +10 dB and reconnect the audioinput to the STL transmitter composite BNC connector.

Remove the 50 Hz high-pass filter from the distortion measurementset and replace it with the 75 Us de -emphasis network.

Rotate the RELATIVE ADJUST on the distortion measurement set for

a reference of 10 dB.

Disconnect the audio input from the STL transmitter composite

BNC connector.

Measure the de-emphasized SNR using the same method described

above.

Troubleshooting:

1. If the STL link fails to meet the ultimate SNR specification, thesensitivity test (paragraph) should be performed on the receiver

prior to troubleshooting the transmitter.2. If the STL link fails to meet the SNR specification, and the

transmitter is suspected, the following method may be used tohelp isolate the problem:

a. Using the 80 kHz filter on the distortion measurement set,measure the output of the meter board for a reading at least3 dB greater than specified for the ultimate SNR.

A5-15

2. b. Substitute the first sampling P.L.L. (876.50 MHz) using an RFsignal generator such as the HP -8640B at an output level of

+10 dBm.

c. Substitute the VCO /Modulator signal using the RF signalgenerator at an RF level of +7 dBm.

The STL center frequency may be obtained from the serial numberlabel on the back of the STL transmitter.

A5.2.5 Stereo Separation and Stereo Signal -to -Noise Ratio

Specification:

Separation


50 dB or better from 50 Hz to 15 kHz.

75 dB or better (typically 77 dB orbetter).

Description:

The stereo separation alignment is accomplished using a stereogenerator and demodulator of known quality, and an audio spectrumanalyzer with tracking generator.

TRANSMITTER

COMPOSITE

DIRECTIONALCOUPLER

LOAD

ATTENUATOR

STEREO

GENERATOR

STEREOSWITCH

AUDIOAMPLIFIER

AUDIOSPECTRUMANALYZER

CAUTION:

*CAUTION:

Figure A5-7

DISTORTIONMEASUREMENT SET

rg-

SWITCHABLEATTENUATOR

* RECEIVER

==iANT.

(COMPOSITE

Place the transmitter RF Powerswitch in STANDBY until the coupler and

attenuator are connected.To avoid receiver damage, initially setattenuation.

. Stereo separation test setup

A5-16

Test Equipment:

Directional Coupler

Attenuator, 50 ohm LoadAttenuator, AdjustableDistortion Measurement SetSpectrum Analyzer

Audio AmplifierStereo GeneratorStereo DemodulatorStereo Source Selector

Procedure:

Microlab/FXT CB -49NPhilco, 662A-30Kay Elemetrics Corp., 432DHewlett-Packard HP -330A

Tektronics 7L5 with Option 01,and Main Frame

See Figure 6-17CN ROOD Model 203TFT 724A(Internal in CN ROOD 203)

1. Connect the equipment as shown in Figure A5-7. This test shouldbe run flat;i.e., the stereo generator pre -emphasis and thestereo demodulator de -emphasis should be switched out. If this

cannot be accomplished, the system modulation reference levelshould be reduced to -20 dB at 400Hz. Adjust the controls on theaudio spectrum analyzer as follows:

FrequencyDot FrequencyLogSourceModeTerminateREF

ResolutionSPAN/DRVTime/DIVTracking GEN

Far left graticuleZero Hz10 dBFREE RUNNORM1MdBVCoupled2 kHzAuto

ON

2. Set the RF Power switch on the STL transmitter to the ONposition.

Using the METER FUNCTION switch on the transmitter, select theFWD POWER position. Verify that the meter reads between 10 and12 watts.

Using the METER FUNCTION switch on the transmitter, select thePGM LEVEL position.

Adjust the level control on the audio spectrum anaylzer to 1.0kHz, and the SPAN/DIV to zero.

Adjust the level control on the audio spectrum anyalyzer for areading of zero dB on the top scale of the transmitter meter.

Set the dot frequency on the audio spectrum analyzer to zero andthe SPAN/DIV to 2 kHz.

Using the METER FUNCTION switch on the receiver, select the RFLEVEL position.

A5-17

2. cont. Position the switches on the adjustable attenuator for a readingbetween 1 mV and 3 mV on the receiver RF Level indicator.

Using the METER FUNCTION switch on the STL receiver, select thePGM LEVEL position. Verify that the meter reads within +1 dB ofthe STL transmitter meter.

1 I 1

Reference

Level

Separation

Vert

Stereo separation: Measurementof the worst -case ratio in dB ofresidual signal in the stereo

demodulated right channelreferred to the demodulated leftchannel with a left -only driving

signal for frequencies between 30Hz and 15 kHz; the procedure isrepeated for right to left

channel separation.

= 10 dB/div Hor = 2 kHz/div

Figure A5-8. Swept separation waveform.

3. Select the LEFT ONLY position on the stereo source selector.

Adjust the step and VAR attenuators on the audio spectrumanalyzer so that the waveform is at the top graticule. (SeeFigure A5-8.)

Select the RIGHT ONLY position on the stereo source selector.

Adjust R31 on the receiver Main Board for maxuim seperationbetween 10 and -15 kHz.

Verify that the separation is greater than 50 dB between 1 kHzand 15 kHz.

4. Connect the spectrum analyzer to the right output of the stereodemodulator.

Select the RIGHT ONLY position on the stereo source selector.Adjust the step and variable attenuators on the audio spectrumanalyzer so that the waveform is at the top graticule. (SeeFigure A5-10.)

Select the LEFT ONLY position on the stereo source selector.Verify that the separation is greater than 50 dB between lkHz and15 kHz.

A5-18

5. Connect the audio output of the distortion measurement set to thestereo source selector. Connect the left output of the stereodemodulator to the input of the distortion measurement set.Set the frequency on the distortion measurement set to 1 kHz.

Select the LEFT + RIGHT position on the stereo source selector.Adjust the output level on the distortion measurement set for areading of zero dB on the top scale of the STL transmitter.Using the METER FUNCTION switch on the STL receiver, select thePGM LEVEL position and verify that the meter reads within +1 d B

of the transmitter program level.Adjust the input controls on the distortion measurement set for a

zero dB reference.Set the frequency on the distortion measurement set to 50 Hz.Verify that the reference on the distortion measurement set is

+0.5 dB.select the RIGHT ONLY position on the stereo source selector.Using the input attenuator on the distortion measurement set,measure the separation.Verify the separation at 50, 100 and 500 Hz.

6. Connect the input of the distortion measurement set to the right

channel of the stereo demodulator.Position the input range and relative ADJ controls on the distor-tion measurement set for a zero dB reference.Select the RIGHT ONLY position on the stereo source selector and,if required, adjust the zero dB reference on the distortion mea-surement set.Select the LEFT ONLY position on the stereo source selector.Using the input range controls on the distortion measurement set,measure the right channel separation.

7. Stereo signal -to-noise ratio. This test should be run using the

normal 75ps de -emphasis characteristics of the stereodemodulator.Connect the audio output of the distortion measurement set to thestereo source selector.Set the stereo source selector to the LEFT + RIGHT position.Using the 50 Hz high-pass filter, connect the left channel of thestereo demodulator to the distortion measurement set input.Using the METER FUNCTION switch on the STL transmitter, selectthe PGM LEVEL position.Adjust the output of the audio oscillator on the distortion mea-surement set for a frequency of 400 Hz.Adjust the output level on the distorion measurement set so thatthe transmitter meter reads zero dB on the top scale.Using the METER FUNCTION switch on the receiver, select the PGMLEVEL position, and verify that the meter reads within +1 dB ofthe transmitter meter.Adjust the input range and relative ADJ controls on the distor-tion measurement set for a zero dB reference on its meter.Position the stereo source selector to the OFF position.Measure the stereo demodulated signal-to-noise ratio for the leftchannel using the input range control on the distortion measure-ment set. This value should be greater than 72 dB.Using the 50 Hz high-pass filter, connect the input of the dis-tortion measurement set to the right channel, and repeat thetest.

A5-19

TroubleshootingThe performance of the stereo generator and stereo demodulator can be

verified by connecting the output of the stereo generator directly to the input of

the stereo demodulator.

A5.2.6 Stereo CrosstalkSpecification:

Subchannel to main channel 50 dB or betterMain channel to subchannel 50 dB or better

DescriptionThe crosstalk measurements are made using a streo generator of known

quality, a low -distortion audio oscillator, and an audio spectrum analyzer.

TRANSMITTER

(RF OUT)

DIRECTIONALCOUPLER

COMPOSITEt=---STEREOGENERATOR

STEREOSELECTOR SW.

DISTORTIONMEASUREMENT SET

LOADATTENUATOR

SWITCHABLEATTENUATOR

AUDIO

SPECTRUMANALYZER

RECEIVER

ANT.

COMPOSITEOUT

CAUTION: Place the transmitter RF POWER switch in STANDBY

until the coupler and attenuator are connected.

*CAUTION: To avoid receiver damage, initially setattenuator for maximum attenuation.

Figure A5-9. Stereo crosstalk test setup.

Test EquipmentDirectional CouplerAttenuator, 50ohm LoadAttenuator, AdjustableDistortion Measurement SetAudio Spectrum AnalyzerStereo Source SelectorStereo Generator

Microlab/FXR CB -49NPhilco 662A-30Kay Elemetrics Corp. 432DHewlett-Packard HP -339A

Tektronix 7L5(Internal on CN. Road 203)CN. Rood Model 203

L

ProcedureConnect the equipment as shown in Figure A5-9. This test should

be run with the stereo generator pre -emphasis switched out.2. Set the RADIATE/STANDBY switch on the STL transmitter to the

RADIATE position. The RADIATE status LED should be green.Using the METER FUNCTION switch, select the FWD POWER position,and verify that the meter of the STL transmitter reads between 10

and 12 watts.

A5-20

2. cont. Using the METER FUNCTION switch on the transmitter, select thePGM LEVEL position.

Adjust the frequency controls on the distortion measurement setfor a value of 15 kHz.Adjust the oscillator output level on the distortion measurementset to that the transmitter meter reads zero dB on the topscale.

3. Position the switches of the adjustable attenuator so that thereceiver bargraph reads 1 mV.Using the METER FUNCTION switch on the receiver, select the PGMLEVEL position. Verify that the receiver meter reads between -1and +1 dB on the top scale.

4. Position the controls on the audio spectrum analyzer as follows:DOT MAR Dot on far left graticuleDOT FREQUENCY Zero HzLOG 10 dB/DIVSOURCE Free runMODE NORMRESOLUTION CoupledSPAN/DIV 5 kHzTIME/DIV AUTOTERMIN Z 1 M ohmREF dBV

A

jr-19 KHz Pilot

B

Vert = 10 dB/.div Hor = 5 kHz/div(A) Nonlinear crosstalk, main to sub.

19 KHz Pilot

fL

E

L

Vert = 10 dB/div Hor = 5 kHz/div

(B) Nonlinear crosstalk, sub to main.

A=15 kHz L+R Ref. level.

B=2nd harmonic distortion level at

30 kHz.Nonlinear crosstalk main to sub =the difference in dB between levelA and level B (60 dB in this

example).

CL and CU = lowersideband level at

45.5 kHz.D=intermodulation15 kHz.

E=linear (vector)7.5 kHz. This signal is a productof the stereo generator.Nonlinear crosstalk sub tomain=the difference in dB betweenlevel CL or CU and level D + 6 dB(60 dB in this example).

and upper L -R30.5 kHz and

product at

crosstalk at

Nonlinear crosstalk: Measurement of the ratio in dB of harmonicproducts in the subchannel referred to 15 kHz L+R at 100%

modulation in the main channel (M+S); measurement of the ratio indB of intermodulation products in the main channel referred to

7.5 kHz L -R at 100% modulation in the subchannel (S+M).

Figure A5-10. Nonlinear crosstalk.

A5-22

5. Measure the stereo crosstalk as follows:

a. Using the attenuator on the audio spectrum analyzer, adjust

the 15 kHz waveform to the top graticule. (See Figure

A5-10).b. Calculate the main channel to subchannel crosstalk by

measuring the indicated waveforms and using the formula

shown in Figure A5-10. This value should be greater than

50 dB.

c. Adjust the frequency of the distortion measurement set to

7.5 kHz.

d. Position the stereo source selector (Internal in CN ROOD

203) to the left minus right position.

e. Calculate the subchannel to main channel crosstalk by

measuring the indicated waveforms and using the formula

shown in Figure A5-106. This value should be greater than

50 dB.

Troubleshooting1. The stereo generator's performance can be verified by connecting

the composite output to the input of the audio spectrum analyzer

and performing the tests specified in step 5 above.

2. If the STL link is identified as the source of excessive stereocrosstalk, the following steps should be taken:

a. Verify that the cover is on the RF amplifier, and installthe covers on the STL transmitter and receiver using atleast two screws.

b. Ensure that the STL transmitter and receiver are more than

2 feet apart.c. Verify that distortion is less than 0.2%, using the

procedure shown in part A5.3.5.

1

11

Module Adjustments

A5.3

modules.This subsection is intended to aid in alignment of individual

8301 Sampling Phase Lock Loop L.O. 6608-33758301 Front End Board 6608-33478301 63 MHz to 850 kHz I.F. Board 6608-33608301 Main Board 6608-33638301 Bar Graph Display Board 6608-3346

8300 VCO/Modulator 6608-3377 A2 -A2

8300 VCO/Mod Synthesizer 6608-3376 A2 -A3

8300 Output VCO Board 6608-3374 A2 -A4

8300 1 Watt Driver Board 6608-3378 A2 -A5

8300 Al Power Amp Assy 5102-3384 Al

8300 Meter Board 6608-3395 A3

8300 Bargraph Display 6608-3348 A4

8300 Sampling Phase Lock Loop Upconverter(Refer to 8301) 6608-3375 A 2 -Al

Test Equioment

RF GeneratorAttenuator, AdjustableRF Spectrum Analyzer

Distortion Measurement SetCounterMultimeterFM Demodulator

RF

GENERATOR

IF

Hewlett-Packard HP -86408Kay Elemetrics 4328Hewlett-Packard HP -85598Hewlett-Packard HP -339AFlukeData Precision 238(See Figure A5-20)

r1 SAMPLINGPHASE LOCK L00UP CONVERTER

ADJUSTABLE RF

ATTENUATOR

= = =

COUNTERIN,

PF

SPECTRUMANALYZER

FM

DEMODULATOR(SEE FIG. A5-20)

PGM OUT

DISTORTIONMEASUREMENT

SETIN 7=

Figure A5-11. Test set-up for Sampling Phase Lock Loop Upconverter.

A5-24

Procedure

1. Connect Frequency counter to the emitter of Q6.2. Adjust C22 for exact crystal frequency (87.6500 MHz).3. Short the juction of R20, R23, and R21 to ground. Looking at the

0 V T.P. with an oscilloscope DC coupled, adjust R28 for asymmetrical waveshape (Time High is equal to Time Low).

4. Remove short from board.5. Connect spectum analyzer to RF output of board.6. Connect DC Voltmeter to 0 V T.P.7. Adjust C9 for a DC Voltage that is as close to 0 volts as

possible and still remain locked on the proper harmonic.Frequency should be exactly 10 time crystal frequency.

8. RF output should be approximately +10 dB to +2 dB.9. Connect frequency counter to center RF output, check L.O.

frequency.10. Connect RF output into adjustable attenuator. Set 8640 B to

875.650 MHz at +7 dBm.11. Modulate the 8640 B to 50 kHz deviation at 400 Hz. Take

reference output from audio out on FM Demodulator intodistortion test set.

12. Turn off modulation and measure signal-to-noise ratio. It should

be >-63 dB.13. Using DVM measure the DC voltage at CR8 cathode. Voltage should

be 1VDC +.2V.

Test EquipmentRF Generator

Spectrum Analyzer

RF

GENERATOROUT

Hewlett-Packard HP -86408 or Equiv.Hewlett-Packard HP -85598

RF INPUT

FRONT END BOARD

63.00 MHz F-

r-

SPECTRUMANALYZER

Figure A5-12. Test set-up for Front End Board ( 6608-3347).

A5-25

Procedure

1. To test the front end board, it is necessary to have the L.O.Board operational. Inject the RF signal into J1 on the front endboard at the RECEIVE frequency.

2. Connect the spectrum analyzer to the 63 MHz output. Adjust thespectrum analyzer for 63 MHz.

3. Adjust the 8640B output level to -43 dBm. The 63 MHz signal onthe spectrum analyzer should be -21 dBm +2dB.

4. Depress the RF gain switch on the front panel of the 8301. The

output level on the spectrum analyzer should drop by 10 dB+1 dB.

Test Equipment

Signal GeneratorMultimeterSpectrum Analyzer

Distortion Test SetAttenuatorAttenuator, Adjustable

SIGNALGENERATOR

Hewlett-Packard HP -8640BData Precision 238Hewlett-Packard HP -8559BHewlett-Packard HP -339BSierra 611A-30Kay Elemetrics 432B

63 MHz to TP3

850 KHz IF bd.

SPECTRUMANALYZER

Figure A5-13. Test set-up for 63 MHz to 850 kHz I.F. Board (6608-3360).

Procedure

1. Set up the equipment as shown in Figure A5-13. Adjust the 8640to 63.00 MHz at an RF level of -40-dBm.

2. Lift one end of cap C6, .01ufd, (the end connected to R6, 51ohm.)Inject the signal from the 8640 into the lifted side of C6.Short the base of Q7 to ground.

3. Remove U2 to defeat the AGC, and connect the spectrum analyzer toT.P. 3. Set the spectrum analyzer for a center frequency of63 MHz, a bandwidth of 30 kHz, scan time of approximately 5msec,input attenuation of -10 dB/div. 100 kHz/divison scan width.

4. Sweep the 8640 frequency manually +1 MHz.

A5-26

5. Tune C11, C14, C18, and L6 for high gain at 63 MHz and a

symetrical waveshape response. [See figure A5 -14(B).] Thefilter output level should be approximately -26 dBm.Note: If any tuning stage can not be tuned above and below

63 MHz, capacitor C10, C15, or C19 may be changed by +3pffor proper tuning range.

6. Change the spectrum analyzer for a scan width of .5 MHz, inputattenuation of -25 dBm, and 2 dBm/div.

7. Sweep the 8640 +2.5 MHz from the center frequency of 63 MHz.8. On this expanded scale, fine tune C11, C14, C18, and L6 for a

symetrical waveshape. [See figure A5 -14(A).]9. Place C6 back down on the PCB and inject the 8640 into the 63 MHz

I.F. input. Set spectrum analyzer back to the 10 dB/div.settings shown in steps 3 through 5. Make sure that the symetrythrough the saw filter and the tuned filter is good. Tune Ll andL2 for a symetrical waveshape. Re -install U2, and disconnect thespectrum analyzer from T.P. 3. Remove short from Q7 base.Solder jumper from El to E2.

10. Connect 850 kHz output to main board 850 kHz input.11. Set the 8640B to an RF level of lmV.12. Using the RF Voltmeter measure 62.15 L.O. output level at C32.

It should be .5VRMs or +7 dBm.13. Measure AGC with a DC voltmeter and set using R58 for 1 VDC.14. Connect the receiver to the transmitter through the appropriate

attenuators to obtain an RF level of -47 dBm.15. Connect the audio generator to the audio input of the 8300. Set

level for 1.24 RMs at 38 kHz.16. Adjust L10 and Lll for lowest AGC voltage possible.

Monitor both distortion and AGC while tuning Ll and L2. Adjustfor lowest distortion while keeping the AGC voltage at as low a

level as possible.17. Reset AGC for 1 vDC.18. Measure distortion at 1 kHz, 15 kHz, 25 kHz, and 38 kHz.19. Inject the 8640 into the out input of the of the 8301 at lmV.

Check AGC +1 vDC. Adjust if necessary.

PowerdBm

Power

dBm

63 tvliz to

A5-27

FigureA5 -14(A)

FigureA5 -14(B)

Test EquipmentRF GeneratorDistortion Test SetMixer

Attenuator, AdjustableAttenuator, 30 dBStereo GeneratorStereo Demodulator

RF

GENERATOR

ADJUSTABLE

ATTENUATOR

+7dBmL.O.

MIXER1-20dBm

Hewlett-Packard HP -8640BHewlett-Packard HP339AMini -Circuits ZAD-2Kay Elemetrics 432BSierra 611A-30CN. RoodTFT 724A

See

FIG. A5-

8300 PGMMOD

RF-OUT

30dBATTN.

STEREOGENERATOR DIST

MAIN BD.

TIOUT TEST SET IN

Figure A5-15. Main Board test set-up.

PGMOUT

STEREO 1DEMODULATOR

Procedures1. Connect equipment up as shown in Figure A5-15. The 8300 used in

the test setup must be operating within specifications.2. With the I.F. Bandwidth switch in the wide position and the 8300

being modulated to +50 kHz deviation at 400 Hz, check the outputlevel of the PGM. It should be 1.24 VRMs +.05 V.

3. Measure distortion at 400 Hz, 1 kHz, 5 kHz, and 15 kHz. Thedistortion should be within specifications of the 8301.

4. Measure stereo separation from 40 Hz to 15 kHz, using theinternal generator on the stereo generator. The separationshould be greater than 50 dB over the 40 - 15 kHz band.

5. Measure SNR using the distortion test set. It should be greaterthan -60 dB below 100% without de -emphasis.

6. Procede with steps 3, 4, and 5 with the I.F. Bandwidth switch inthe narrow position.Distortion should be less than .3%.Stereo separation should be greater than 45 dB.SNR should be greater than 60 dB below 100% modulation.

7. With the meter function switch in the +12 volt position adjustR54 for a 12 volt indication on the meter.

A5-28

8. With +50 kHz deviation at 400 Hz applied to the receiver adjust

R62 for 100% on the PGM meter position.

8301 Bargraph Display (6608-3346)

Test EquipmentMultimeterSignal Generator

Procedures

1. Inject RF into the ant input of the receiver at lmV with +50 kHzdeviation at 400 Hz modulation. Check the AGC line with -the

multimeter, it should be +1 volt DC.2. Observe the bargraph display. Adjust R30 for 100% reading.3. Adjust R4 to indicate lmV RF level, make sure the RF gain switch

is in the high gain position.4. Reduce the level to 40 01/ and adjust R38 for 40 PV indication.5. Repeat step 4 for 10DPV, 400iV, and 3 mV levels and the

corresponding pot for each level.

Test EquipmentRF GeneratorAttenuator, AdjustableDistortion Test SetSpectrum AnalyzerCounterMultimeterFM Demodulator

RF SIGNALGENERATOR

L.O.

RF SPECTRUMANALYZER

RF IN

RF

Data Precision 238Hewlett-Packard HP -8640B

Hewlett-Packard HP -86408 or Equiv.Kay Elemetrics 432B or Equiv.Hewlett-Packard HP -339A or Equiv.Hewlett-Packard HP -8559AFluke or Equiv.Data Precision 248(See Figure A5-20)

FM 1

DEMODULATOR

PGM OUTPUT

L _7ADJUSTABLEATTENUATOR

Figure A5-16. Test set

tP.

VCO/MODULATORVCO/MOD.

SYNTHESIZER

DISTORTIONMEASUREMENT

SET

,,OUT IN ,

up for VCO/Modulator Adjustment.

A5-29

VCO/Modulator and VCO/Mod SynthesizerVCO/Modulator (6608-3377)

Linearity Adjustment Adjustment for minimum distortionC15 VCO/Mod Frequency adjustmentE3 Test point for monitoring output level of

VCO/modulatorVCO/Mod Synthesizer (6608-3376)

TPI Phase detector output

ALM Alarm output for detecting loss of lock5 MHz 5 MHz ref output

VCO/Modulator Output Frequency

+N

Transmitter Output Frequency Minus 876.50 MHz

VCO/Modulator Frequency Divided by 50 kHz or62.5 kHz increment depending on if offset isrequired

BINARY CONVERSION TABLE

2048 1024 512 256 128 64 32 16 8 4 2 1

Subtract each quantity from 01 number. Put a "1" above number if it is equal to

or greater than, or "0" if less than.Example: Transmitter frequency = 950.00

Increment is 50 kHzVCO/Modulator Frequency = 950.00 - 876.50

= 73.50 MHz+N = 73.50 MHz/50 kHzN = 1470

1470 is less than 2048 0

1470 minus 1024 = 446 1


446 minus 256 = 190 1

190 minus 128 = 62 1


62 minus 32 = 30 1

30 minus 16 = 14 1

14 minus 8 = 6 1

6 minus 4 = 2 1

2 minus 2 = 0 1

0 minus 1 = -1 (No remainder) 0

0 1 0 1 1 0 1 1 1 1 1 0

2048 1024 512 256 77 64 32 76 8 4 -7 7

A5-30

Procedure:

1. Connect equipment as shown in figure A5-16.

2. Adjust the controls on the RF generator for a frequency that is850 kHz below the VCO/Modulator frequency.

VCO/Modulator Freq = Transmitter Frequency minus 876.50 MHz

Using the spectrum analyzer adjust the adjustable attn for -15 to-20 dBm from the mixer.

Reconnect the mixer to the FM demodulator.

3. Adjust the oscillator output on the distortion measurement setfor a frequency of 1 KHz and a level of 1.24 V rms (3.5 V p -p).

4. Distortion and AFC Level Alignment.

Using the multimeter, monitor V T.P. and adjust the VCO/MODadjust so that the voltmeter reads between 4.0 and 4.5V.

Using the distortion measurement set, verify that the output ofthe FM demodulator is between 1.0 and 1.5 V rms.

Measure the distortion of the output of the FM demodulator, andadjust the Varicap Bias adjustment on the FMO (adjustment A) fora minimum distortion reading.

Note: Normally there are two setting of the Varicap Biasadjustment that will produce minimum distortion. Varicap bias

should be adjusted to the setting that produces the lowestdistortion.

Readjust the VCO/MOD ADJ so that the voltmeter reads between 4.0

and 4.5 V.

Repeat this procedure until the varicap bias is set for minimum

distortion and the 0V level adjustment is between 4.0 and 4.5 V.

Set the frequency on the distortion measurement set for 15 KHz

and verify that the distortion is less than .15%.

Equipment Required [Test Equipment]

Spectrum Analyzer HP8559BOscilloscope TEK-465 or Equiv.Multimeter Data Precision 238

OSCILLOSCOPE :

ADJUSTABLEATTENUATOR

ri

1/4 --

OUTPUT VCO

SPECTRUMANALYZER IN

Fig A5-17 Output VCO Test set-up6608-3374 A2 -A4

A5-32

Procedure:

1. To test the output VCO the sampling phase lock loop upconverter

and the VCO/Modulator must be operational.

2. Disconnect the coax that connects the output VCO to the 1 watt

driver. Connect a piece of coax to the output of the output VCO.

Connect setup together as shown in Fig A5-17. Adjust the

attenuator for -20 dB attenuation.

3. Disconnect the VCO/Modulator signal. With the oscilloscope

observe OV pin. Adjust R16 for a symetrical waveform. Reconnect

the VCO/Modulator.

4. Connect the multimeter to the OV pin and adjust the tune for

+6 Vdc at this point.

5. The output level should be +17 dBm + 2d8.

Using the multimeter, monitor V T.P. and adjust the VCO/MOD

adjust so that the voltmeter reads between 4.0 and 4.5V.

Using the distortion measurement set, verify that the output of

the FM demodulator is between 1.0 and 1.5 V rms.

Measure the distortion of the output of the FM demodulator, and

adjust the Varicap Bias adjustment on the FMO (adjustment A) for

a minimum distortion reading.

Note: Normally there are two setting of the Varicap Bias

adjustment that will produce minimum distortion. Varicap bias

should be adjusted to the setting that produces the lowest

distortion.

Readjust the VCO/MOD ADJ so that the voltmeter reads between 4.0

and 4.5 V.

Repeat this procedure until the varicap bias is set for minimum

distortion and the OV level adjustment is between 4.0 and 4.5 V.

Set the frequency on the distortion measurement set for 15 KHz

and verify that the distortion is less than .15%.

Spectrum AnalyzerAttenuator (30 dB)MultimeterPower Meter

1 WATT

DRIVER

Equipment Required

ATTENUATOR

HP8559B

Sierra 661A-30Data Precision 238HP435A

SPECTRUMANALYZER

Fig A5-18 Test set-up for 1 watt driver6608-3378 A2 -A5

Ah

POWER

METER

A5-34

Procedure:

1. To test the 1 Watt driver the output VCO, sampling phase lockloop up converter and VCO/Modulator must be operational. Connect

the equipment as shown in Fig. A5-18.

2. Turn on the RF power switch on the front panel of the 8300.Adjust C13 and C15 for max. power output as observed on the

spectrum analyzer.

3. Disconnect the spectrum analyzer and connect the output to the

power meter. The output level should be +31 dBm +1.5 dB.

4. Readjust the output VCO tune capacitor for +6 Vdc on the 0 V

T.P.

5. Measure the 1 watt level T.P. with the multimeter. Make a note

of this level for future reference.

6. Disconnect the attenuator from the 1 watt driver. Adjust R9 for

a maximum current of 110 mA into the +12S supply line.

7. Adjust R3 for maximum of 120 mA into the +12 supply line.

8. Reconnect the attenuator and recheck the power output. It

should still be above 1 watt or +30 dBm.

Equipment Required

Power Meter30 dB AttnMultimeter Data Precision 238

Spectrum Analyzer HP -8559B

A2 CASTING Al MODULEWATTMETER

30 dBATTENUATOR

Fig A5-19 Test set-up for Al Module

IFSPECTRUMANALYZER

A5-36

Procedure:

1. Set-up equipment as shown in Fig. A5-19. A2 casting must beoperational for testing.

2. Adjust R64 on front panel board for +12 Vdc on P.A. Supply.

3. Adjust Cl, C7, C11 for maximum power output. Observe output on

spectrum analyzer for parasitic oscillations and spurs.

4. Using the multimeter in the current measuring position, check thecurrent to the final amp.

Meter Bd. (6608-3395) A3

PRGM DEV

MUX DEV

MUX 1

MUX 2

Program Deviation Adjust, (R23). Sets the transmitterdeviation of the composite signal. Normal input level is

1.24 Vrms. This should correspond to 100% on the frontpanel meter. R23 should be adjusted for +50 kHz deviationfor 100% modulation.

Multiplex Deviation Adjust, (R39). Sets the transmittermultplex deviation. 100% indication on the frontpanel meter, on either MUX 1 or MUX 2, should provide+12 kHz deviation of the main carrier.

Multiplex 1 (R32) Adjusts the input sensitivity of the MUX1 input. Maximum sensitivity of .54 Vrms will be 100% or+12 kHz deviation.

Multiplex 2 (R31) adjusts the input sensitivity of the MUX2 input. Maximum sensitivity of .54 Vrms will be 100% or+12 kHz deviation.

8300 Bargraph Display 6608-3348 A4

1. Inject a level of 1.24 Vrms into the composite input. Thisshould give a level at 100% on the meter. Increase the levelto 120% modulation.

2. Adjust R8 for a full scale indicator on the bargraph display.3. Reduce the level to 70%. Adjust R2 for a minimum indication on

the bargraph display.

RF INPUT

L.O.

86408

LO

IF

ADJUSTABLEATTENUATOR

RF

Mixer

=1,

RF

FM

DEMOD. AMPSEE FIG A5-21

850 KHz INPUT

8301 MAIN BD.

8301 Front Panel ControlsRF Gain Hi

IB BW WideMETER SELECT PGM

Figure A5-20 FM Demodulator Setup

luF

10K

H

luF

51 .10K _LluF

330 -T-

+12V

100

330 .<1111H;luF

al

lu

850 KHz to8301 Main Bd.

Transistors are 2N2222

All Capacitors are 1 uF monolithic ceramicResistors are 1/4W carbon composition 5

Figure A5-21

FM DEMOD AMP

A5-38

IN

.47 uF 12K

12K

4, -

.0068 uF

Figure A5-22. 75 Us de -emphasis network.

OUT

A5-39

P/N 5004-8300Rev HJune 13, 1988Equiment Serial No.Shipping Date

OPERATION MANUAL


PART B



PART

Model 8300

950 MHz Transmitter

TABLE OF CONTENTS

SECTION B 1 GENERAL INFORMATION 61-1

BI.1 General Description 61-1

61.2 Specifications 81-2

SECTION B 2 INSTALLATION (See Section A 2)

SECTION B 3 CPERATION (See Section A 3)

SECTION B 4 THEORY OF OPERATION

64.1 General 64-1

B4.2 Elock Diagram Discussion 64-1

B4.3 Schematic Diagram Discussion

E4.3.1 Power Amp Assy Al 84-2

64.3.2 Sampling Phase Lock Loop A2 -A1 64-2

64.3.3 VCO/Modulator A2 -A2 B4-3

64.3.4 VCO Synthesizer A2 -A3 64-3

64.3.5 Output VCO A2 -A4 64-4

64.3.6 1 Watt Driver A2 -A5 B4-5

64.3.7 Audio/Meter Bd. A3 B4-5

64.3.8 Bargraph Display B4-6

SECTION B 5 MAINTENANCE

65.1 General B5-1

65.2 Access 65-1

65.3 Periodic Maintenance 65-1

SECTION B 6 DIAGRAMS

Figure B1

Figure

Figure

Figure

Figure

Figure

Figure

Figure

Figure

Figure B10 System Wiring Diagram

B9 Bargraph Display A4

B8 Audio/Meter Bd A3

DWG NO.

Block DiagramModel 8300 6600-2281

B2 Power Amp/Power Supply 6601-3396


B3 Sampling Phase Lock Loop A2 -A1 6601-3375


B4 VCO/Modulator A2 -A2 6601-3377


B5 VCO Synthesizer A2 -A3 6601-3376


B6 Output VCO A2 -A4 6601-3374


B7 1 Watt Driver A2 -A3 6601-3378


6601-3395


6601-3348


6600-2271

SECTION B1

GENERAL INFORMATION

B1.1 General Description

The TFT 8300 Series STL Transmitters are for use at thestudio site in an STL System. Each generates a frequency -synthesizedcarrier, using crystal -controlled, phase -locked loops. Program audioand two additional subcarriers can frequency -modulate the carrier. RFpower output is adjustable. Built-in protection circuits shut downthe transmitter in case of synthesizer lock fialure.

Two transmitters can be used with an optional Model 7770Transmitter Automatic Changeover unit to provide automatic transfer tothe standby in case of transmitter fialure.

All of the transmitters are 5-1/4" high and mount in astandard 19 -inch relay rack.

Transmitter

RF Power Output

RF Output Connector

Deviation for 100% Modulation

Frequency Stability

Spurious and Harmonic Emission


Modulation Inputs

Power Source


10-14 Watts adjustable downto 4 watts


±50 kHz

Better than .0001%, 0°C to50°C

60 dB or more below carrierlevel

One Stereo Composite Programand Two Subcarrier Channels

Composite: 3.5V peak -to -peak.10K ohms balanced andunbalanced, BNC and terminalstrip. Multiplex: 1.5V peak -to -peak, 10K ohms BNC, (2

each), frequency range 130 to300 kHz

115/230 VAC + 10%, 50/60 Hz,80 Watts, 24 VDC optional

One 3 1/2" analog meter formonitoring power output powersupply, bias voltages,multiplex and programmodulation, LED bargraph formonitoring 70 to 120% programchannel modulation.

31.2 Specifications

Frequency Range (MHz) 940-960

RF Power Output (watts, max) 14 w

Output Connector 50 ohmType NFemale

Frequency Stability (ppm/yr) +1

Frequency Accuracy:O'C to +50'C +0.0001%

Spurious Signal Suppression:Non -Harmonically Related (dB) >-65Harmonically Related (dB) 77-65

AM Noise (dB below carrier) >-65

Freq. Dev. for 100% Mod:Composite & Monaural (kHz) +50Multiplex Channels (kHz) 712

Modulation Input Levels: *Composite & Monaural (V rms)Multiplex (V rms)

124053

AC Line Power (watts) ** 70

Operating Temperature Range ("C) -10 to +50

Dimensions:

Height 5 25"(13.3 cm)

Width 19"

(48.3 cm)Depth 13"

(33 cm)

Weight (pounds) 29(kilograms) 13.1

* 10 k ohm imput.

** 120/240 VAC, 50-60 Hz.

B1-2

SECTION B4

THEORY OF OPERATION

B4.1 General

The Model 8300 Transmitter uses a triple phase -lockedloop (PLL) system to develop a frequency synthesized carrieroutput in the 940-960 MHz band. The carrier can be frequencymodulated with a composite audio signal plus two multiplexsignals for program or control use. Specifications are found inSection A1.2.

B4.2 Block Diagram Discussion (Figure Bl)

The transmitter carrier frequency, in the frequencyrange of 940 to 960 MHz is generated by a voltage -controlledoscillator (VCO) on the Output VCO Board. Its output isamplified by the 1 -Watt Driver, which drives the 12 -Watt PowerAmplifier. The RF output can be turned on and off by switchingthe dc voltage to the 1 -Watt Driver. Output power is adjusted byvarying the dc operating voltage to the Power Amplifier.

The frequency of the VCO is controlled by a phase -lockedloop (PLL) in which a sample of the VCO output is down -convertedby mixing it with an 876.5 MHz LO signal from the Sampling Phase -Locked Loop Board. This signal, in the frequency range of 63.5to 83.5 MHz, is compared in the phase detector with a frequencyderived from a 5 MHz crystal oscillator on the VCO to itsassigned frequency.

The LO signal for the mixer on the VCO Board is gen-erated on the Sampling Phase -Locked Loop Board by a VCO in a PLLwhose reference frequency is supplied by an 87.65 MHz crystaloscillator and a X10 multiplier circuit using a step recoverydiode.

The reference frequency for the phase detector on theOutput VCO Board comes from a VCO on the VCO/Modulator Board.This VCO is in a PLL with a phase detector operating at 500 Hzfor 50 kHz steps (or 625 Hz for carrier frequencies spaced in62.5 kHz steps in the 940-960 MHz band). Audio modulation fromthe Audio/ Meter Board is applied to the VCO on the VCO/ModulatorBoard to frequency modulate the reference input to the Output VCOBoard and thus the transmitter carrier.

Inputs from all three PLLs are supplied to an alarmcircuit on the Sampling Phase -Locked Loop Board to turn on thefront panel SYSTEM LOCKED LED and turn off the RF power output ifany of these loops becomes unlocked. The alarm circuit is alsotriggered by a failure of the crystal oscillator on the VCOSynthesizer Board.

Power for all modules in the casting (Assembly A2) andfor the Audio/Meter Board comes from a supply on the Audio/MeterBoard. Power for the Power Amplifier Board comes from a supplyon the Power Amplifier Assembly, Al.

B4-1

3.4.3 Schematic Diagram Discussion

34.3.1 Power Amplifier Assembly Al (Figure B2)

TrYs assembly contains both Power Amplifier and the Power Supply.

The power supply circuit is shown at the top of Figure B2. The power

transformer and rectifier mounted on the chassis furnish +unregulated DC V to

pin 1 of J1. This is regulated by J1 to +12V and fed to the 1 Watt Driver,

which draws about 750 mA.

The unregulated voltage at Jl pin 1 is also applied to the

high -current (3.5 A) supply consisting of regulator U2 and shunt transistor Q3.

R2 limits current to a safe value in case the supply output is short circuited.Q1 and Q2 make up a switching circuit, controlled by the front -panel RF POWER

switch, for turning on and off the power supply and thus the 12 W Amplifier.The switching circuit also controls the power to some of the phase -lock

circuitry.

The voltage out of the high -current supply is adjusted by means of

the front -panel RF POWER OUTPUT ADJ control, which is a 100K ohm variable

resistor on the Audio/Meter Board that is connected across pins 1 and 2 of J2

on the Power Supply. When the resistance across pins 1 and 2 is 0 ohms, the

power supply output if 5V; when the resistance is approximately 22K ohms, the

output is 14V.

The circuit of the 12W Power Amplifier is shown at the bottom of

Figure B2. The input from the 1W Driver at J1 goes to amplifier Q1 through a

mathcing network composed of Cl and some printed inductors. Q1 develops

approximately 4 W. Its collector is matched into the emitter of amplifier Q2

through the matching network consisting of C5, L2, C6, and C7. Q2 is matched

into a 50 -ohm low-pass filter and into a printed circuit directional coupler

which, with diodes CR1 and CR2, provides dc voltages proportional to forward

and reflected power, respectively. The RF output at J2 is 12 W nominal at 50

ohms. Power output can be adjusted by means of the front -panel RF ADJ control

as described in the preceding paragraph.

B.4.3.2 Sampling Phase -Locked Loop A2A1

Q7, Yl, and associated components make up a crystal oscillator

operating at 87.65 MHz. Emitter follower Q6 and amplifier Q5 feed the crystal

oscillator output into the primary of transformer Ti. T1 drives step recovery

diode CR6 in a X10 multiplier circuit. The 876.5 -MHz multiplier output is

applied to one input of balanced mixer CR4/CR5. The other input to the mixer

comes from voltage controlled oscillator Q4, whose nominal frequency is also

876.5 MHz. If there is a difference in the two mixer input frequencies or

phase, a dc voltage is produced across the mixer's resistive load. This

voltage is fed through adjustment potentiometer R28 and loop amplifier U1-7 to

varicap CR3 in the tuned circuit of Q4, tuning Q4 back into lock. The

886.5 -MHz output of Q4 is delivered to mixer Ul on the Output VCO Board. The

output is also rectified by CR8 so that its level can be checked at TP1. The

loop error voltage can be monitored at the LO test point shown at the left side

B4-2

64.3.2 Continued

loop error voltage can be monitored at the LO test point shown at the left sideof the schematic.

U1-1, Ql, Q2, Q3, and Q8, and associated components make up anunlocked -loop alarm and power -turnoff circuit. Pin 3 of comparator U1-1 isbiased to approximately 3.5V. In the absence of an alarm input, pin 2 of Ulis at less than 3.5V and the comparator output at pin 1 will be +12V. Thisturns off Q1 and the front -panel SYSTEM UNLOCKED LED in its collector circuit.The output of U1-1 also turns on Q2 and Q3 to supply +12V to the 1 W Driver andthus turn on the RF output of the transmitter.

If the phase -locked loop on the Sampling Phase Lock Loop Boardbecomes unlocked, the sweeping of the dc error voltage at pin 7 of U1 will becoupled through C3 and rectified by CR2 to produce a positive voltage at pin 2of U1. Likewise, if the phase -locked loop on the VCO Synthesizer Board or theOutput VCO Board becomes unlocked, a positive voltage will be supplied to pin 2of U1. Any of these conditions will cause U1-1 to output -12V, which will turnon Q1 and the SYSTEM UNLOCKED LED. It will also turn off Q2 and Q3 to removeoperating voltage from the 1 W Driver and turn off the Rf output of thetransmitter.

When the front -panel power switch is in the STANDBY position, itsupplies a positive voltage through J3-1 and J2-13 of the Audio/Meter Board tothe base of Q8 on the Sampling Phase Lock Loop Board. Q8 then turns off Q2 andQ3 to remove the +12V supply from the 1 W Driver. In the POWER ON position,the front -panel switch supplies 0 V to reverse the operation and enable RFoutput.

B4.3.3 VCO/Modulator A2A2 (Figure 84)

The VCO for this module is common -gate FET Ql. Its tuned circuitconsists of a printed inductor connected to the drain of Q1 together withassociated capacitors. A dc tuning voltage from the phase -locked loop in theSynthesizer module comes in at E4 and is applied to varicap CR2 to keep the VCOon frequency. C15 tunes the Q1 tank circuit so that it is within the controlrange of the phase -locked loop.

The VCO output is amplified by Q2 and Q3 and delivered to the Output

VCO module via E2. The VCO output is also fed through voltage divider R2/R3 tothe phase -locked loop on the Synthesizer module.

The VCO is frequency modulated by an audio signal (MODULATION IN)from the Audio/Meter Board which is applied to varicap CR1 in the tunedcircuit of Ql. R14 adjusts the bias on CR1 so that the varicap is operating inits linear range and thus producing minimum distortion.

B4.3.4 VCO Synthesizer Module A2A3 (Figure 65)

!his module is the phase -locked loop for the VCO/Modulator. A

sample of the VCO/Modulator output, which is a frequency in the range of 53.5to 73.5 MHz, is divided by 100 in Ul. Q1 and associated components drop the

B4-3

I.

=34.3.4 Continued

+12V supply voltage to +5V to operate Ul. The TTL-level output of U1 is

amplified by Q2 to a CMOS level and applied to the divide -by -N dividers U2 and

U3. The divider circuits in U2 and U3 are set to give a value of N that dillproduce an input to the phase comparator in U3 of 500 Hz for transmittercarrier frequencies that are spaced 50 kHz apart in the 940-960 mHz band, or625 Hz for carrier frequencies spaced 62.5 kHz apart. The value of N for thedivide -by -N dividers is determined by the settings of the eight switches in SWIand the four switches in SW2. A closed (grounded) switch is a 0 and an open

switch is the number shown on the schematic. For example, if the requiredvalue of N is 1200, the 1024, 128, 32, and 16 switches would be open and allother switches closed.

The reference input to the phase comparator in U3 comes from the5 -MHz crystal oscillator consisting of crystal Yl, NAND gate U6-10 and sent tothe casting, where frequency can be measured. The reference frequency isbuffered again by U6-3 and fed to divide -by -N counter U5. The input will be

divided by 100 if pins 5 and 12 are jumpered to +12V and pin 11 is jumpered toground; this is the setup for transmitter carriers spaced by 50 kHz. For

transmitter carriers spaced by 62.5 kHz, pins 5 and 12 are jumpered to ground

and pin 11 is jumpered to +12V to divide the input by 80.

The output of U5 is fed to U3, where it is divided by 100 in a fixed

divider. The output of this divider is the reference input to the phasecomparator in U3. The ouput of the phase comparator, which is the loop errorvoltage, is taken from pin 13 of U3, amplified by U4, and sent to the VCOModulator to tune the VCO.

The VCO Synthesizer Board provides two inputs to the alarm circuiton the Sampling Phase Locked Loop Board. One of these generates an alarm ifthe VCO Modulator phase locked loop becomes unlocked. The other generates analarm if the crystal oscillator does not operate. Q3 is normally turned off byits positive base bias. However, if the PLL of which U3 is a part becomes

unlocked, pin 12 of U3 will go low and turn Q3 on; Q3 then delivers a positiveinput to the alarm circuit on the Sampling Phase Locked Loop Board which lightsthe front -panel SYSTEM UNLOCKED LED and turns off the transmitter output.

When the output from crystal oscillator buffer U6-3 is normal, it

will be rectified by CR2 and inverted by U6-4 to deliver a positive voltage tothe base of Q3. If, however, the crystal oscillator fails, the +12V throughpull-up resistor R28 will be inverted by U6-4 to turn on Q3 and deliver apositive alarm signal to the Sampling Phase Locked Loop Board.

B4.3.5 Output VCO Module A2A4 (Figure B6)

Q7 is the VCO, operating on a frequency in the range of 940 to 960MHz. It supplies approximately 50 mW to the 1 W Driver, and also furnishes aninput to a PLL consisting of mixer Ul, amplifier Q5/Q6, phase comparator U2,amplifier Q4/Q3, amplifier Ql, and varicap CR4. 01 mixes the 940-960 MHzsignal with an 876.5 -MHz input from the Sampling Phase Lock module. The

resulting frequency in the range of 53.5 to 73.5 MHz is low-pass filtered by L2and C3, amplified by Q5/Q6, and fed to phase comparator U2.

B4-4

84.3.5 Continued

The VCO Modulator Board outputs the identical frequency derived froma crystal oscillator on the VCO Synthesizer Board. If there is a difference infrequency or phase between the two inputs to U2, it will develop a dc outputwhich is amplified by differential amplifier Q3/Q4, and by Q1/Q2 whichfurnishes an error voltage to varicap CR4 in the tuned circuit of Q7. When theloop is out of lock, the circuitry of Q1 through Q4 will sweep the erorvoltage from -12V to +12V until the loop locks again. R16 adjusts thesymmetry.

When the loop is out of lock, the sweeping voltage at the collectorsof Q1 and Q2 is coupled by C13 to CR3. The resulting dc voltage is sent to thealarm circuit on the Sampling Phase Lock Board to turn on the alarm circuit onthe Sampling Phase Lock Board to turn on the front -panel SYSTEM UNLOCKED LEDand to turn off the transmitter output.

B4.3.6 1 -Watt Driver A2A5 (Figure B7)

The output from the VCO Output module, in the range of 940 to 960MHz, is applied to the base of amplifier Q2 through a stripline matchingnetwork. The 1W output of Q1 is matched to a transmission line which goes tothe 12W Amplifier Module.

Transistors Q5, Q6, and Q7 provide overcurrent protection for Q2,limiting the collector current to approximately 100 mA in case of an open loadon Q2. R3 is adjusted so that the collector current of Q1 can never exceed 200mA.

The loop consisting of CR1 and associated capacitors provides a dc

output that is proportional to the RF output of the 1W Driver. This dc outputgoes through a metering circuit to the front -panel meter so that the RF outputlevel can be monitored.

There are two +12V inputs to the 1W Driver. One is switched +12Vfrom the Sampling Phase Lock module that is applied to Q2 through itscurrent -limiting circuit. This supply comes from a circuit on the SamplingPhase Lock Board that turns off the +12V and thus the transmitter RF outputwhen it senses an out -of -lock condition. The other +12V is the regular supplyfrom the Output VCO module.

B4.3.7 Audio/Meter Board A3 (Figure 88)

This board does all the audio processing for the transmitter,combining the audio signals for the VCO/Modulator Board. It also contains themetering circuitry.

The audio input at the rear panel is brought onto the Audio/Meter

Board at J6. This input can be balanced (+) audio, or it can be compositeaudio if J6-3 is grounded. The input is applied to the differential amplifierconsisting of Ul, U2, and U3, and fed through switch S1 to U4. The switch isplaced in the position shown on the schematic for composite audio. When

monaural audio is used, the switch is placed in the opposite position which

B4 -5

54.3.7 Continued

provides 75 -microsecond preemphasis.

From U4, the audio goes into summing amplifier U5, whicn drives tneVCO/Modulator. The MUX 1 and MUX 2 inputs at pins 6 and 8 of J4 are fedthrough level adjust potentiometers R31 and R32 into summing amplifier U6 andthen combined with the program audio in U5.

Levels are factory adjusted so that 1.24 V rms into the balanced

input produces +50 kHz deviation in the transmitter output frequency. A level

of 0.53 V rms as either the MUX 1 or MUX 2 input will give a 100% indication on

the front -panel meter (+12 KHz deviation).

When two subcarriers are being used, a jumper must be connected

between terminals E4 and E5 on the board. This cuts the gain of U6 in half, sothat both MUX 2 will indicate 100% on the meter for +6 kHz deviation. The

maximum deviation for the program signal plus all subcarriers must not exceed+62 kHz.

The metering circuit consists of U8-1, U8-7, and associated

components. U8-1 is a positive peak detector with a response that is flatbeyond 200 kHz. U8-7 is the meter amplifier, which drives the front -panelmeter through pins 3 and 6 of J3. Low -voltage ac for the meter light comesfrom a transformer on the chassis via pins 4 and 5 of J3.

Input to the metering circuit is via the front -panel multiplepushbutton switch S3. When the PRGM button is pressed, the program audio is

selected. It can be flat or with preemphasis depending on the connection ofthe jumper at E2. When MUX 1 or MUX 2 is pressed, the signal at the MUX 1 or

MUX 2 level adjust potentiometer is selected. When INT TP is pressed, the

input comes from whichever one of the test points E7 through E13 is jumpered toE14. When -12V is pressed, a fraction of the -12V supply voltage, inverted by

U7, is selected. When FWD PWR or REV PWR is pressed, the input from theforward power or reflected power directional coupler on the Power Amplifier isselected.

The front -panel RF PWR ADJ potentiometer (R64) is in the control

circuit of regulator U2 on the Power Supply, as described in paragraph 84.3.1.

U9 and Q1 constitute a power level sensing circuit. The dc input from the

directional coupler on the Power Amplifier Assembly, which is proportional toRF power output, is compared in U9 with a reference voltage set by

potentiometer R67. If the power level drops below the preset reference, Q1 is

turned on , producting a TTL low at pin 1 of J4. Pins 1 through 4 of J4 go

through the rear -panel REMOTE connector to an optional Model 7770 Transmitter

Auto Changeover unit. A TTL low at pin 1 will cause the changeover unit toswitch transmitters, provided the MANUAL/AUTO TRANSFER switch (S2) on the

Audio/Meter Board is in the AUTO TRANSFER position.

The power supply consisting of bridge rectifier K2, regulator U10,and associated components furnishes regulated -12V to the casting (from B on

the schematic) and to the Audio/Meter Board. A full -wave, high -current bridge

rectifier mounted on the chassis supplies a positive input to Ull, which

B4-6

64.3.7 Continued

regulates it to +12V for the casting (from A on the schematic) and for theAudio/Meter boarc.

B4.3.8 Bargraph Display (Figure B9)

The program audio from A3 -J3 -I3 is applied to active peak detectorU1/CR1/C1. The resulting dc voltage, which is proportional to modulationpercentage, is fed through amplifier U2-7 to the bargraph display (CR2). The

circuit is calibrated by means of R8, which controls the gain of U2-7. Thecircuit consisting of U2-1, 01, and Q2 provides a reference voltage for Ul andU2-7.

The bargraph display indicates modulation percentage within range of70 to 120 percent.

B4-7

SECTION 65

MAINTENANCESTL TRANSMITTER

B5.1 General

Once installed, the TFT Series 8300 Studio Transmitter Link shouldrequire little maintenance. The units should be installed away from vaccuum

tubes and other heat generating equipment.

65.2 Access

Model 8300 Series STL Transmitter

To gain access to circuit assemblies and top -of -chassis components,

remove to top cover. Assembly locations and interconnections are shown inFigure 610.

B5.3 Periodic Maintenance

Once installed, the only maintenance necessary is a periodic proof

of performance check of the system to be assured of optimum operation.

The performance of the STL transmitter can be easily and quickly

checked at the front -panel multimeter. Following installation of the STLsystem, the operational front -panel meter readings for each position of the

meter selector switch should be recorded. This gives a quick and accuratecheck of system performance by allowing a comparison of present operation to

its operation when new. Gradually changing readings can be quickly spotted bythis method and used to forstall developing problems.

Note

Whenever the transmitter is in operation with RF Power on, the RFOutput must be terminated into a 50 ohm, 15W minimum load or the STL antenna.If operated unterminated for extended periods, the RF Power Amplifier can be

damaged.

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2. CAPACITOR VALUES IN PIC_c3pARADS1. RESITOR VALUES ARE INS (72)Htvv,,1/6\^1,5Y"c.,CAR LOtAR

NOTES, UNLESS OTHERWISE SPECIFIED ;

REFLECTED

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A

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NO.PART NO. DESCRIPTION REF

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REMOVE ALL

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TOLERANCES UNLESS

OTHERWISE SPECIFIED.XX ANGULAR.XXX±. ±

ENG.

DATE

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2 ASSEMBLE HEAT SINK , P/N 2001- 1940ONTO CHASSIS, P/N Zoo I- 1990.

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CAPACITOR,TYP BOTHENDS

SOLDERINGIRON TI P"

SOLDERINGAID TIP.

SHIM THICKNESS AS READFOE EACH. CAPACITOR

(Cl 0.050)

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SOLDERING AID

SOLDERINGIRON TIP

SIMILARLY, SOLDER CAPACITORS CIZ, C15 AND CI4

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(TYP)

2.420

II- The NEXT STEP 15 TO INSTALL COILS LI , L2 AND L3.ALONG WITH CAPACITORS. CZ AND CaINSERT +LEADS OP C2 AND Ca ONTO LARGE CAPACITORS

AND C9 , USING THE HOLE oN THE LARGE CAP TERmtuAL, po NOT SOLDER!TRIM THE LEAD. AS SHoRT AS PRACTICAL AND WRAPAROUND TERMINAL FoR C.PoC, MECHANICAL JOINT.,OLDER NEGATIVE- END OF CZ AND CE TS aRou....)o PLANE, KEEP/NGLEAD AS SHORT AS PRACTICAL,

3 4 5

4C/0

4.G. ORSYM DESCRIPTION DR CNA LJTH DATE

u..ce 49...?"0 .9A0dY

&re 77 /ce /..r 70... 1. 227P e4-4,- A -I co,

htF: vc,/pC BD /60o-2060

(CO D)INSERT el ONTO STE.A,CHT LOILIC.LEGc..,er.,LEAD OF LI. INSERT LONG-LEGGED LEADTHROUGH TERMINAL HOLE OF CS WHICHALSO HAS ONE LEG OF CZ ALREADY CRIMPEDONTO IT. Do NOT SOLDER YET.THE ome$2. END OF LI HAS A HOOKED LEADWITH A BENT Fool'. PLACE THE BENT FOOTEXAcTLy ON THE CENTER. OF THE TRACE WHICHGOES TO THE. COLLECTOR (CENTER -)LEADOF 6:21, THE FOOT MUSTER AS CLOSETS, THE LEAD AS FO55113LE.APPLY SUFFICIENT SOLIDER To COMPLETELYENCLOSE THE BENT FOOT,

LAG: itoRouLtpzeo ATHSEWOTHER TE00L10,zorGI,L1.(TOAocNKOTSOLDER C 2 TO TERMINAL. DO

NOCOVER

AkielevAe:TAeFIREIFTF:1:4:7 JET!oke-0:LIfc,k1GC::7.See NOTE15).

SIMILARLY, LOCATE THE SENT FOOT OF LON THE CENTER OF THE TRACE AS CLOSE AS PossteLeTO THE COLLECTOR (CENTER)LEAD OF Q2,soLoara,INSERT E2 ONTO orHee END OF L2 UNTIL IT SNUGSUP AGAINST COIL, USING A PAIR OF LONG -NOSE PLIERS,FORM A FOOT To CAPTAIATE THE FERRITE BEAD 52,50. -DER THE FOOT TO THE GROUND PLANE. AT ACONVENIENT FiDINT WHICH WILL NOT STRESS THE COIL.AGAIN, PROVIDE SUFFICIENT SOLDER TO COMPLETELYENCLOSE THE. (SENT FOOT.

12 TRIM LEADS cini TH13 COMPONENTS, RI, R2 , R5, 124,cRI. AND CR2 AS SHowN HERE.

EVEN WITH EoDY of PARTSOLDERING FOOT

APPLY SUFFICIENT SOLDER To E=NTIRELYCOVER SOLDER FooT ON EACH ENO of PART,

13. LAST, SOLDER RED WIRES , No 226A STRANDED4/00-0002 , FROM FEED THROUGH CAPACITORSTo eoAeo AS sk+ov../...) ABOVE. KEEP WIRES ASSHORT AND DIRECT AS Possiet_e , BUT NOTTAUT. (DWG 5I-hovsis WIRE CURVED ARoo t.)0FARTS ONLY/ FOR CLARITY. WIRE ENDS ATCS 4,-)t> C9 ARV To BE SOLDERED ONLYAFTER R./GER-no...) 7I4RoLi414 TERmIKJA4... 1-101-.E.S

ON TAB. THE TACK 'SOLDERED COIL ANDCAPACITOR LEADS ARE TO BE THORo04HLYSOLDERED AT Tli I SCOMPLETION of Asst.- EmeLy.

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CKT REF DESCRIPTION QTY TFT STOCK NO

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CR1 010. HP 2810 1 1283-2810CR2 010. HP 2810 1 1283-2810

El SHIELDING BEADS 1 1501-0654E2 SHIELDING BEADS 1 1501-0654E3 SHIELDING BEADS 1 1501-0654(4 SHIELDING BEADS 1 1501-0654

31 CONN, RF SUB MINI RT ANG 1 2210-5153

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COPPER FOIL 3/4 WIDE A/R 5001-0003

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FRACTIONS DECIMALS ANGLES111 -

CONTRACT MO.

trEETIME & FREQUENCYTECHNOLOGY INC

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NEXT ASSY USED ON

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Model 8300 TransmitterVCO/Modulator Board

PCB Assy. 6608-3377Rev. F

CKT. REF. DESCRIPTION QTY. TFTSTOCKNO.

0001 CAP ELECT 47MFD 35V VERT MT 1 1010-0470C002 CAP MINI CER 39PF NPO SECT 1 1017-0790C007 CAP MICA 56 PF 1 1001-0560C004 CAP MINI CER 39PF NPO RECT 1 1017-0790C005 CAP CER 0.001MF CK05 1 1015-0010C006 CAP CER 0.001MF CK05 1 1015-0010C007 CAP CER 0.001MF CY-05 1 1015-0010C008 GAP CER 560PF CKO 5BXK 1 1015-0560C009 CAP CPR 0.001MF CK05 1 1015-001,C010 NOT USED 1 1000-000C011 CAP MINI CER 6.8PF NPO RECT 1 1017-0063C012 CAP CER 0.001MF c1'05 1 1015-00100013 CAP MICA CM04 220PF 1 1001-2200C014 CAP MICA 27FF 500V 1 1001-0270C015 CAP VAR #5601 7-20PF 1 1012-0720C016 CAP ELECT 47MFD 758 VERT MT 1 1010-0470C017 CAP CER 0.001MF C1:05 1 1015-0010C018 CAP MINI CER 10PF NPO RECT 1 1017-0100C019 CAP ELECT 47MFD 35V VERT MT 1 1010-0470CO20 CAP CER .0082MF CKO 500 1 1015-0082CO21 CAP MINI CER 53PF NPO RECT 1 1017-0330CO22 CAP CER 100 PF 1 1015-0100CO23 CAP CER 0.001MF CK05 1 1015-00100024 CAP CPR 0.001MF cros 1 1015-0010CO25 CAP TAN 1MFD 35V 1 1009-0011CO26 NOT USED 1 X000-0001CO27 CAP CER DISC 33PF NPO 100V 107. 1 1005-0074CO28 CAP CPR DISC 79PF 5750 100V 107. 1 1005-0039CR01 DIO VARICAP DKV6520 1 1290-6520CR02 DIO VARICAP DKV6520 1 1290-6520CR07 DIODE HP2810 771 1 1283-2810L001 INDUCTOR 10.0UH 1 1570-0100L002 CHOKE .12UH 771 1 1531-0012L005 CHOKE .12UH 771 1 1571-0012L004 INDUCTOR 10.0UH 1 1570-0100L005 CHOKE RF 12 UH 1 1570-0120L006 CHOKE, R F 4.7UH 1 1531-04710001 TRANS 255109 1 1271-51090002 TRANS SF SIG NPN .75918 1 1271-09130003 TRANS FET UHF U510 1 1271-0710R001 RES CAR COMP 1/4W 5% HI REL 56 OHM 1 1062-00568002 RES CAR COMP 1/4W 57. HI KEL 370 OHM 1 1062-0370ROOT RES CAR COMP 1/4W 57 HI REL 56 OHM 1 1062-00568004 RES CAR COMP 1/4W 51 82 1 1065-00828005 RES CAR COMP 1/4W 5% 82 1 1065-00825006 RES CAR FILM 1/4W 5% 1011 1 1065-1002

Page 1 of 2

Model 8300 TransmitterVCO/Modulator Board

PCB Assy. 6608-3377Rev. F

CKT. REF. DESCRIPTION QTY. TFT STOCK NO.

R007 RES CAR FILM 4.7K 1/4W 57. 1 1065-47018008 RES CAR FILM 1/4W 57. 1K 1 1065-10018009 RES CAR COMP 1/4W 5% HI REL 680 OHM 1 1062-0680R010 RES CAR COMP 1/4W 57. H/ REL 470 OHM 1 1062-0470R011 RES CAR COMP 1/4W 57 HI REL 220 OHM 1 1062-0220R012 RES CAR COMP 1/4W 57 HI REL 220 OHM 1 1062-02208013 RES CAR COMP 1/4W 57. HI REL 220 OHM 1 1062-02208014 RES VAR PC MT VERT IK 10T 1 1072-1000R015 RES CAR FILM 1/4W 57. 1012 1 1065-1002R016 RES CAR COMP 1/4W 57 HI REL 2.2 K 1 1062-22018017 RES CAR COMP 1/4W 57. 100 1 1065-01008018 RES CAR COMP 1/4W 57. 1.511 1 1065-15018019 RES CAR COMP 1/4W 57. HI REL 150 K 1 1062-15038020 RES CAR FILM 1/4W 5% 10K 1 1065-1002R021 RES CAR COMP 1/4W 57 2K 1 1065-2001

Page 2 of 2

4 3 2

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82,00 6608-3348MODEL NEXT ASSY

APPLICATION


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MATERIAL asw rola, 3090 OAKMEAD VILLAGE DR.SANTA CLARA, CA. 95051I I- I Mr NOW 727-7272 TWX 910-338-0584

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FILLET RADIOS. - MAXTHREADS- CLASS 2MARK IN ACCORDANCEWITH TFT SPEC 5300-18511

MATERIAL 3090 OAKMEAD VILLAGE DRI SANTA CLARA. CA. 95051INC 14081717-7272 TWX 910-338 0584

FINISH

DA /0 -/Z -I3

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SIZE

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Model 8300

Assy Name: System Wiring Diagram

A sy No.

Rev. C

6600-2271

CO RU

DE

SC

RIP

TIO

NO

TT

TF

T S

TO

CK

NO

.

Filter Fuse Holder

11910-0006

Fuse -

15A SB

11900-0012

XFMR Power Torold

11501-0009

Switch - SPDT Blk

11800-7162

LED Grn 5082-4950

11285-4950

LED MV 5025

11285-5028

Meter -

Mntr

11400-0060

Lamp - Meter

22300-7382

C11.15

Terminal Blk 3 POS

11700-0174

CMJ3

Conn RF BNC Insulated

12200-3110

CHJ2. CHJ

Conn RF BNC Ch. Mt.

22200-7935

C1W4

Socket 9 PIN

12250-0009

Cl

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11010-2002

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11284-0801

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of

P/N 5004-7770

REVISION A

s/A, Jo/a-0464

DEC. 1 4 1989

TFT

MODEL 7770 TRANSMITTER AUTOMATIC CHANGEOVER

PART C

TFT, Inc.3090 Oakmead Village DriveSanta Clara, CA 95051

(408) 727-7272

TABLE OF CONTENTS

SECTION Cl GENERAL INFORMATION

C1.1 General DescriptionC1.2 Specifications

SECTION C2 INSTALLATION

SECTION C3 OPERATION

SECTION C4 THEORY OF OPERATION

C4.1 GeneralC4.2 PC Board Schematic Diagram Discussion

SECTION C5 MAINTENANCE

SECTION C6 DIAGRAMS

Page

C1-1

C1-1C1-1

C2-1

C3-1

C4-1

C4-1C4-1

C5-1

C6-1

SECTION Cl

GENERAL INFORMATION

C1.1 General Description

The Model 7770 Transmitter Automatic Changeover is used

in an STL Hot Standby Transmitter System to automatically switch from the

primary transmitter to the standby transmitter whenever there is a failure

in the primary. Front -panel switches also enable the operator to manually

switch between transmitters. A rear -panel terminal strip provides outputs

to drive an external status indicator or alarm.

The Model 7770 is 1-3/4" high and mounts in a standard

19 -inch relay rack at the studio.

C1.2 Specifications

RF Input 100 W maximum. Type N femaleconnector.

External Alarm Output Positive 50 V maximum, sink 250 mAmaximum.

Transmitter Control SPDT contact closure, 1 A at 26 V DC.

Power Required 120/240 V AC, 10 W maximum, 50-60 Hz.

Temperature Range -10°C to 50°C.

SECTION C2

INSTALLATION

Installation instructions for the 7770 TransmitterAutomatic Changeover are contained in Section A2 of Part A of this

manual.

C2-1

SECTION C3

OPERATION

Operating instructions for the 7770 TransmitterAutomatic Changeover are contained in Section A3 of Part A of thismanual.

C3-1

SECTION C4

THEORY OF OPERATION

C4.1 General

The Model 7770 Transmitter Automatic Changeover monitorsthe RF power output and synthesizer lock circuits of the two transmitters,and transfers operation to the standby unit if there is a failure in theoperating unit. Provision is also made for switching the transmitters man-ually by means of front -panel pushbuttons; such manual switching overridesthe automatic switching. In the AUTO mode, Transmitter No. 1 is selected

as the operating transmitter when power is first applied to the unit.

C4.2 PC Board Schematic Diagram Discussion(Drawing No. 6601-3236)

When power is first applied to the board, the chargingcurrent through C2 will turn on Ql. If front -panel AUTO switch S1 -E is

closed (thus opening S1 -D and S1 -C), Q1 will energize Kl, and contactsKl-A will energize coaxial antenna relay K2, connecting the antenna toTransmitter No. 1. Contacts K1 -B connect the grount at J5 pin E to J5 pin D,which is applied to P1-19 (Remote Input in Model 7730 Transmitter) of BoardA4 of Transmitter No. 1 to turn on power to its Upconverter (2 -Watt Driverin the Model 7730 Transmitter), and thus turn on the RF output from Trans-mitter No. 1.

When Transmitter No. 1 starts delivering RF power, P1-2(P1-14 for Model 7730 Transmitter) on the transmitter Board A4 will go highprovided all transmitter synthesizer circuits have locked. This high, whichis brought into the Transmitter Automatic Changeover at J5 -B, holds Q1 onafter C2 has charged and thus keeps KI and K2 energized. Transmitter No. 2will not be turned on because J6 -D will not be grounded, thus removing powerfrom the transmitter's Upconvertor (or 2 -Watt Driver).

If Transmitter 1 fails (loss of synthesizer lock or lossof RF output), J5 -B will go low, turning off Q1 and thus de -energizing K1 andK2. The antenna will now be connected to Transmitter No. 2 through the con-tacts of K2; and J6 -D will be grounded, turning on the Upconverter (or 2 -WattDriver) of Transmitter No. 2 through P1-19 (or Remote Input) of its PowerSupply Board A4.

If Transmitter 2 fails after it has been selected as theoperating transmitter, P1-2 (or P1-14) of its Board A4 will go low. Thislow is applied through J6 -B of the Transmitter Automatic Changeover and

C4.2 Continued

comparator Ui to the base of Q2, turning it off. The resulting high at thecollector of Q2 causes Q1 to energize K1 and K2, transferring operation toTransmitter No. 1. The time constant of C4 and R9 keeps the relays energizeduntil Transmitter No. 1 delivers a high to J5 -B.

Pressing front -panel XMTR ON 1 switch S1 -C will energizeK1 and K2 and thus lock in Transmitter No. 1 as the operating transmitter.Pressing XMTR ON 2 switch S1 -D will open both S1 -E and S1 -C, thus deenergiz-ing K1 and K2 and locking in Transmitter No. 2 as the operating transmitter.

Green LED CP5 (AC POWER) lights whenever +8V is deliveredby regulator U2. Green LED CR2 (XMTR 1 RADIATE) lights when relay KI turnson Transmitter No. 1, and red LED CR6 (XMTR 2 RADIATE) lights when KI turnson Transmitter No. 2.

If Transmitter No. 1 is the operating transmitter in theAUTO mode, the changeover operation and Transmitter No. 2 can be tested bypressing front -panel XMTR TEST 2 switch S1 -B. This turns off Ql, de -energiz-ing K1 and K2 and thus transferring operation to Transmitter No. 2.

If Transmitter No. 2 is the operating transmitter in theAUTO mode, pressing XMTR TEST 1 switch S1 -A will energize K1 and K2 throughQ2 and Ql, transferring operation to Transmitter No. 1 and thus verifyingthe operation of the Transmitter Automatic Changeover and Transmitter No. 1.

Relay contacts K1 -A are connected to terminal board J4for operating an external alarm or status indicator. The contacts willhandle 150 mA maximum at 50 V.

SECTION C5

MAINTENANCE

Maintenance instructions for the Model 7770 Automatic Changeoverare contained in Section B5 of Part B of the manual.

C5-1

SECTION C6

MODEL 7770 AUTOMATIC CHANGEOVER DIAGRAMS

DESCRIPTIONDRAWING NO.

Transmitter Transfer Board 6601-3230Parts List and PCB Assembly 6608-3230

C6- 1

70 REAR PANELMIR /

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REVISIONS

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CONTRACT MC = TIME & FREQUENCYTECHNOLOGY INC

APPROVAUI DATE

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TRANSMITTER MODEL 7770TRANSFER SYSTEM FIG 6./2

SIZE

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Model 7770 Transmitter Transfer System Assembly 16608-3230Rev E

CKT REF DESCRIPTION QTY TFT STOCK NO.

Cl Cap Cer Disc .01MFD 1005-1039

C2 Cap Elect 1200MFD 15V 1010-1201

C3 Cap Cer Disc .01MFD 1005-1039

C4 Cap Tan 100MFD 20V 1008-0102





C9 Cap Elect 750MFD 40V 1010-0751

CR1 Not UsedCR2 LED Grn 5082-4950 1285-4950

CR3 DIO 1N4002 Rect 1284-4002

CR4 DIO 184002 Rect 1284-4002

CR5 LED Grn 5082-4950 1285-4950

CR6 LED Red 5082-4403 1285-4403

CR7 DIO 184002 Rect 1284-4002

CR8 DIO 184002 Rect 1284-4002

CR9 DIO 184002 Rect 1284-4002

CR10 DIO 184002 Rect 1284-4002

CR11 Not UsedCR12 Not UsedCR13 DIO 184002 Rect 1284-4002

CR14 DIO 184002 Rect 1284-4002

CR15 DIO 184002 Rect 1284-4002

CR16 DIO 194002 Rect 1284-4002

CR17 DIO 184002 Rect 1284-4002

El Relay AZ531-09-1 1880-0010

0 Trans 285089 1271-5089

Q2 Trans 285089 1271-5089

R1 Res Car Comp 1/48 5% 10K 1065-1002

R2 Not UsedR3 Res Car Comp 1/4W 5% 10K 1065-1002

R4 Res Car Comp 1/4W 5% 10K 1065-1002

R5 Not UsedR6 Res Car Comp 1/48 5% 2.7K 1065-2701

R7 Res Car Comp 1/4W 5% 680 1065-0680

R8 Res Car Comp 1/48 5% 470 1065-0470

R9 Res Car Comp 1/48 55 68K 1065-6802

age 1 0

Model 7770 Transmitter Transfer System Assembly 06608-3230Rev E

CET REF DESCRIPTION QTY TFT STOCK NO.

810 Res Car Comp 1/4W 5% 510 1 1065-0510911 Res Car Comp 1/14 5% 1K I 1065-1001SI Switch 2 Pos MOM 3 Pos Latch 1 1850-2005

Ul I/C CA3140 1 1100-3140U2 I/C LM340-8 1 1100-4080

Tyton, Qwk Tie 2 2140-0004

Socket I/C 8 Pin 1 2250-1008

Schematic Ref 6601-3230P C Board 1 1600-3230

Page 7 of ?

P/N 5004-83018

REVISION GDATE JUNE 87

EQUIPMENT S/NSHIPMENT DATE

T F T

MODEL 83018 STL RECEIVER

PART 0

TFT, INC.

3090 Oakmead Village DriveP.O. Box 58088

Santa Clara, CA 95052(408) 727-7272 TWX 910-338-0584

FAX (408) 727-5942

PART D

Model 8301B

940 - 960 MHz STL Receiver

TABLE OF CONTENTS

SECTION D 1 GENERAL INFORMATION D1-1

D1.1 General Description D1-1D1.2 Specifications D1-1

SECTION D 2 INSTALLATION (See Section A 2)

SECTION D 3 OPERATION (See Section A 3)

SECTION D 4 THEORY OF OPERATION D4-1

D4.1 General D4-1D4.2 Block Diagram Discussion D4-1D4.3 Schematic Diagram Discussion D4-2

D4.3.1 Main Board D4-2D4.3.2 Front End Board D4-3D4.3.3 First Local Oscillator Board D4-4D4.3.4 63 MHz to 850 kHz IF Board D4-4D4.3.5 Display Board D4-5D4.3.6 Multiplex Filter Amplifier Board D4-5

SECTION D 5 MAINTENANCE D5-1

05.1 General D5-1D5.2 Access D5-1D5.3 Periodic Maintenance D5-1

SECTION D 6 DIAGRAMS

Figure D1

DWG NO.

Block DiagramModel 8301B Receiver 6600-2377

Schematic, Main Board 6601-3513

Figure D2 PCB Assembly, Main BoardParts List Main Board 6608-3513

Figure D3 Schematic, Front End Board

Figure D4

6608-3513

6601-3347

- PCB Assembly, Front End 6608-3347

Parts List, Front End Board 6608-3347

Figure D5 Schematic Lock Converter LOPCB Assembly, Lock Upconverter 6608-3575

Figure

Figure

6601-3575

D6 - Parts List, Lock Upconverter 6608-3375Schematic, 63 MHz to 850 kHz IF Board 6601-3510

D7 - PCB Assembly, 63MHz to 850kHz IF Board 6608-3510

Parts List 63MHz to 850kHz IF Board 6608-3510

Figure D8 - Schematic, Receiver DisplayPCB Assembly, Receiver Display 6608-3346

Figure D9 - Parts List, Receiver DisplaySchematic, Mixer/Filter Assembly 6601-3511

6601-3346

Figure D10- PCB Assembly, Mixer/Filter BoardParts List, Mixer/Filter Assembly 6608-3511

Figure D11 -

Figure

6608-3346

6608-3511

Schematic, Filter Amplifier 6601-3334

PCB Assembly, Filter Amplifier 6608-3334

D12- Parts List, Filter Amplifier Assembly 6608-3334

Wiring Diagram, STL Receiver 6600-2244

Figure D13- Parts List, System 6600-2244

SECTION D1

GENERAL INFORMATION

01.1 General Description

The TFT 8301B Series STL Receiver is a crystal -controlled, triple -

conversion, FM superheterodyne, FM Composite receiver for use at the

transmitter site in an STL System.

All of the receivers are 3 1/2" high and mount in a standard 19 -inch

rack. The circuitry, except for major power supply components, is contained on

a number of printed circuit boards, most of which are in an RF casting.

Operation of the printed -circuit board circuits is described in detail in

subsection 4.3.

D1.2 Specifications

RF Input Connector

Sensitivity (75 usec de-emphasized)



AM Rejection (400 Hz @ 10%)

Spurious and Image Rejection

Demodulated OutputsProgram

Multiplex

Harmonic Distortion

Stereo Separation

50 ohm, Type "N" female

20 uV for 55 dB Signal -to -Noise ratio100 uV for 70 dB Signal -to -Noise ratio500 uV for 80 dB Signal -to -Noise ratio(with 400 Hz high pass filter)

+200 kHz Min. (WB); +75 kHz Min. (NB)

+1.0 MHz Max. (WB); +500 kHz Max. (NB)

55 dB Min.

60 dB Min.

+4 dBm (1.24 V RMS) into 600 ohms,unbalanced, 50 Hz to 75 kHz.

-3.7 dBm (0.50 V RMS) into 600 ohms,unbalanced, 110 to 220 kHz bandpass

0.2% Max. (WB)

50 dB from 50 Hz to 15 kHz (WB)>45 dB from 50 Hz to 7.5 kHz (NB)>40 dB from 7.5 kHz to 15kHz (NB)

D1-1

D1.2 Specifications, Continued

CrosstalkMain to SubSub to Main

Baseband Response+0.1 dB-70.5 dB

50 dB Min.50 dB Min.

50 Hz to 60 kHz (WB), 50 Hz to 15kHz (NB)20 Hz to 75 kHz (WB), 20 Hz to 53kHz (NB)

Alarm Output (open collector) Relay Contact Closure

Temperature Range -10°C to +50°C

Power Requirements 120/240 V AC, 50-60 Hz, 12 W

Dimensions 3 1/2" (8.9 cm) H x 19" (48.3 cm)W x 15.5" (39.4 cm) D

Weight 10 1/2 lbs.

D1-2

SECTION D4

THEORY OF OPERATION

D4.1 General

The Model 8301B is a triple -conversion, FM receiver operating in thefrequency range of 940 to 960 MHz. It provides a composite audio signal outputplus two multiplex outputs for program or control signals.

D4.2 Block Diagram Discussion (Figure 0-1)

The RF signal, enters the receiver from either an antenna or anoptional Model 7773 Automatic Changeover unit. The signal is fed into acoaxial filter having a 20 MHz 1 dB bandwidth which serves as a preselector.From the filter, the signal is applied to a switchable attenuator controlled bythe front -panel RF GAIN switch. In the HIGH position, the attenuator has zeroloss; in the LOW position, a 10d8 loss.

The signal out of the attenuator is amplified by approximately 18 dBin a low noise two -transistor preamplifier before entering the first mixer.The attenuator, preamplifier, and first mixer are all located on the Front EndBoard. Another 6 dB of amplification is provided after the first mixer, so theoverall gain of the Front End Board is approximately 24 dB.

The LO input for the first mixer comes from a VCO in a samplingphase -locked loop. The VCO frequency is controlled by a crystal oscillatoroperating at 1/10 the VCO frequency. The resulting LO output is 63 MHz belowthe received RF. The 63 MHz IF from the first mixer is fed to a 63 MHz IFamplifier. This amplified output is then fed to the IF Board.

The IF Board input is amplified by a second 63 MHz IF Amplifier andthen fed to a Surface Acoustical Wave (SAW) Filter. This filter has abandwidth of 400 kHz and provides superior selectivity without phasedistortion. From the SAW filter, the 63 MHz signal is fed through a third63 MHz IF amplifier to the second mixer. The LO input for the second mixercomes from the second LO which is a crystal oscillator operating at 73.7 MHz.The 10.7 MHz output of the second mixer is fed to a narrow -band filter having a

bandwidth of 180 kHz, or a low-pass wideband filter. Output from either thenarrow or wideband filter is selected by the front panel IF Bandwidth switchand fed to the third mixer. The LO input for the third mixer comes from thethird LO which is a crystal oscillator operating at 9.85 MHz. The 850 kHzoutput of the third mixer is fed to a low-pass filter, an 850 kHz IF Amplifier,and an output buffer. The buffer output then feeds the 850 kHz input of theMAIN Board. A DC voltage is developed by the 850 kHz IF Amplifier and fed to abuffer. The buffer output is the squelch output of the IF Board and is fed tothe MUTE Comparator on the MAIN Board.

D4-1

D4.2 Continued

The second LO (73.7 MHz) also feeds the signal strength mixer. This

mixer develops a 10.7 MHz output which is fed to a band-pass filter and a 10.7MHz IF Amplifier. The Signal Strength output of the IF Amplifier is fed to abuffer and then to an inverting adjustable gain amplifier. The amplifieroutput is the signal strength output of the IF Board and is fed to the displayboard.

The 850 kHz IF Signal is fed to the Pulse Counting Discriminator on

the MAIN Board. One discriminator output feeds a switching amplifier, and a75 kHz Low -Pass filter. The resultant audio signal is amplified and fed to a

balanced output amplifier which provides composite, and balanced compositeoutput signals and finally, is fed to the display board. The second

discriminator output feeds the two multiplex filters which, in turn, providesthe two multiplex outputs. All these output signals pass through the normallyclosed contacts of Relay Kl. Operation of K1 is controlled by the MUTE

Comparator. If the squelch voltage to the comparator drops below apredetermined level, relay K1 contacts will open, muting the output signals.

The program signal, multiplex signals, and the power supply voltages

are fed to front panel selector switches. Program and multiplex signals arerectified, filtered and become DC voltages fed to the meter amplifier. Power

supply voltages are appled to the meter amplifier unchanged. The meter

amplifier drives the front panel meter.

The program audio output is rectified and compared with a presetreference level on the Receiver Display Board. The output of the comparator isfed to a bargraph display on the front panel to indicate modulation percentagefrom 70 to 120 percent. The AGC is also compared with preset reference levelson the Display Board to turn on front panel LEDs when the signal level exceeds

the preset levels.

D4.3 Schematic Diagram Discussions

D4.3.1 Main Board (Figure D2)

The Main Board contains the demodulator for the 850 kHz IF, meteringcircuits, muting circuits, and power supply rectifiers and regulators. It

delivers the program and multiplex signals to the rear panel connectors, andinputs to the front panel meter.

The 850 kHz frequency modulated signal from the casting enters theMain Board at J2. The signal goes directly to Ul. The signal is limited in Ul,and then each cycle of the signal triggers one-shot U2 which functions as apulse counting discriminator. The pulse train at the output of U2 (pin 4) goesthrough a switching amplifier (Q3 through Q6) to reduce distortion, and thenthrough linear -phase lowpass filter FL1, which extracts the low frequency(modulation) component from the pulse train.

D4-2

D4.3.1 Continued

The audio output of FL1 goes through a matching network (C21, R27,R28) to amplifier U3. A filter (C30, C31, L5) at the output of U3 removes moreof the 850 kHz signal. Phase -shift network R32/C27 compensates for anynonlinearities in the filter and provides excellent stereo separation. U4 isthe output amplifier for the program audio, and U5 is an inverting amplifier toprovide a balanced output.

The pulse train output at pin 13 of U2 (the complement of the pin 4output) is fed the MUX 1 and MUX 2 filter amplifiers, which are tuned toextract the two multiplex signals from the output of the pulse countingdiscriminator.

The metering circuit consists of amplifier U9, peak detectorCR4/C44, and amplifier U10 which drives the front panel meter. When one of thefront panel METER FUNCTION switches is pressed, an input is supplied to themetering circuit through one section of Si. The -12V power supply voltage isinverted by U6 before being fed up to U9. The output of the MUX 1 filteramplifier is amplified by U8 before entering the metering circuit. Noamplification is needed for the MUX 2 signal. The program audio and multiplexsignals are rectified by CR4. R62 is used to calibrate the metering circuitfor voltage levels, and R54, at the input of the progam amplifier, calibratesthe meter for modulation percentage.

The muting circuit consists of comparator U11 and associatedcomponents. If the RF signal is too low for satisfactory reception, thesquelch at pin 3 of J3 will be low. This will produce a low output at U11-6,which will ground the program input to U7 and thus disable the meter formodulation percentage readings.

When a normal signal is being received, the incoming DC at pin 3 ofU11 will be high, so that pin 6 of Ull will be high and CR12 will be off. Thisturns on Q10, Q11, and Q8, energizing K1 which routes the program and multiplexsignals to the rear panel connectors. If, however, the RF signal drops below apredetermined level, the rising squelch voltage will deenergize K1 andinterrupt the program and multiplex signals.

Q7 is also driven by the output of Ull to energize an optionalexternal relay when signal level is normal, and to deenergize it when thesignal fails. The relay is connected to pin 11 of J5.

Front panel RF GAIN switch S2B switches +12V on and off to energizeor deenergize the relay on the casting that switches the 10 dB attenuator in orout of the RF input.

D4.3.2 Front End Board (Figure D3)

The Front End Board includes a switchable attenuator, apreamplifier, the first mixer, and an output amplifier/filter.

The RF signal (940-960 MHz) from the coaxial filter enters the boardat J1. If the front panel RF GAIN switch is in the LOW positon, relay K1 willbe energized, and the signal will be routed through the 10 dB attenuatorR1/R2/R3. In the HIGH position of the switch, K1 is deenergized, and thesignal is routed directly to Q2.

04-3

D4.3.2 Continued

Amplifiers Q2 and Q4 provide approximately 18 dB of gain. Q1 and Q3provide temperature compensated biasing for Q2 and Q4, respectively. The

output of Q4 goes to Z1, where it is mixed with an input from the first LO to

produce an IF of 63 MHz. The 63 MHz IF is passed through a bandpass filter(C17/C18/L5), amplified by Q5, and delivered to the 63 MHZ to 850 kHz IFBoard.

D4.3.3 First Local Oscillator (Figure D4)

The first LO uses a sampling phase -locked loop to generate a

frequency in the range of 877 to 897 MHz (63 MHz below the received signalfrequency). Q7, Yl, and associated components make up a crystal oscillator

operating at 1/10 the required LO frequency. Emitter follower Q6 and amplifierQ5 feed the crystal oscillator output into the primary of transformer T1. T1

drives step recovery diode CR6 in a X10 multiplier circuit. The output of the

multiplier circuit, at the required LO frequency, is applied to one input of

balanced mixer CR4/CR5. The other input to the mixer comes from voltagecontrolled oscillator Q4, whose nominal frequency is also the required LO

frequency. If there is a difference in the two mixer input frequencies, a dcvoltage is produced across the mixer's resistive load. This voltage is fedthrough adjustment potentiometer R28 and loop amplifier U1-7 to varicap CR3 inthe tuned circuit of Q4. The error voltage causes the varicap to tune Q4 back

to the required frequency. The output of Q4 is delivered to the Front EndBoard as the first LO input. The output is also rectified by CR8 so that its

level can be checked at TP1.

The loop error voltage can be monitored at the LO pin shown at the

left side of the schematic. Circuits associated with U1-1, Ql, Q2, and Q3 are

not used in the 8301 Receiver.

D4.3.4 63 MHz to 850 kHz IF Board (Figure D5)

This board, located in the casting, contains the second mixer,second LO, third mixer, third LO, signal strength mixer and various amplifiersand filters.

The 63 MHz IF signal from the Front End Board is amplified by Ul,fed to the SAW filter FL1, and again amplified by U2. Ul compensates for the

filter insertion loss. The 63 MHz signal from U2 is then fed to the

Mixer/Filter Board. The signal is mixed in Ul with the output of the second LO

(Q1) operating at 73.7 MHz. The resultant 10.7 MHz signal is fed to the wide,

or the narrow band filter. The filtered 10.7 MHz signal is then mixed with a

9.85 MHz LO signal in mixer -oscillator U5. The resultant 850 kHz signal from

U5 is fed to a low pass filter, amplified by the third IF amplifier U6, and

finally fed to TTL Level Translator Q2 and Q3. The 850 kHz signal is now fed

to the Main Board.

The DC squelch voltage is developed by a third IF amplifier U6,

buffered by U8 and fed to the Main Board.

Output from the second LO (73.7 MHz) is also fed to the Signal

Strength Mixer U3. The resultant 10.7 MHz signal is fed to a 10.7 MHz Band

Pass Filter and amplified by third IF amplifier U4. The Signal Strength

Component is buffered by U7A and finally fed to adjustable gain amplifier U7B.

The output of U7B is then fed to the Display Board.

D4-4

D4.3.5 Display Board

The Display Board contains the signal level LED indicators and themodulation percentage bargraph, together with the circuits to drive them.AGC from the 63 MHz to 850 -kHz IF Board is applied to the noninverting input ofU1-1. R4 controls the gain of Ul, and is used to calibrate the signal levelcircuitry. The output of U1-1 is fed to all five comparators (U1 throughU3-7). In U1-7, a reference voltage of 2.7V is established by voltage dividerR5/R6. With the RF GAIN switch in the HIGH position (no attentuation), if theRF input is 3 V or greater, the AGC voltage at U1-1 will he 2.7V or lower (AGCvoltage decreases with RF signal increase). This will produce a high positivevoltage at pin 7 of Ul which will turn on CR1. The reference voltages forother comparators (U2-1 through U3-7) are set increasingly higher, so thattheir LEDs will turn on lower RF inputs. Note that the actual LEDs on thefront panel are arranged so that the 40 uV LED is at the left end. Theidentification below each LED (e.g., 120 uV for the left-hand LED) representsthe signal level required to turn on the LED when the RF GAIN switch is in theLOW position.

The program audio from the Main Board is applied to active peakdetector 114-1/CR6/C1. The resulting dc voltage, which is proportional tomodulation percentage, is fed through amplifier U4-7 to the bargraph display.The circuit is calibrated by means of R30, which controls the gain of U4-7.The bargraph display indicates modulation percentage within range of 70 to 120percent.

D4.3.6 Multiplexer Filter Amplifiers

These filter amplifiers are used in the MUX 1 outputs to passcertain bands of frequencies in the demodulated output of the discriminator.Four filter amplifiers are available:

Pass Band Drawing No.

12 to 108 kHz 6601-3310

24 to 88 kHz 6601-3311

39 to 67 kHz 6601-3331

110 to 220 kHz (standard) 6601-3334

The circuitry of all four of the filter amplifiers is identicalexcept for component values. Each consists of a low pass filter in series witha high pass filter to produce the equivalent of a band pass filter. Inputamplifier 01 drives the low pass filter consisting of L2, L4, C2, C3, C4(110-220 kHz filter uses L3 and C4). The filtered signal is amplified by Uland sent through the high pass filter consisting of C8, C9, C10, Cll, C12, L5,and L6. For 24-88 kHz, C9 and C11 are not used. U2 is the output amplifier.

D4-5

SECTION D5

MAINTENANCESTL RECEIVER

D5.1 General

Once installed, the TFT Series STL Receiver should require littlemaintenance. The units should be installed away from vacuum tubes and otherheat generating equipment, and the Model 8301 Receiver should be provided withadequate ventilation.

D5.2 Access

To gain access to circuit assemblies and top -of -chassis components,remove the top cover.

To remove the receiver module from the chassis, remove the top coverand pull the module.

D5.3 Periodic Maintenance

Once installed, the only necessary proofof performance check of the system to assure optimum operation

The performance of the STL transmitter and receiver units can beeasily and quickly checked with the front panel multimeter. Followinginstallation of the STL system, the operational front panel meter readings foreach position of the meter selector switch should be recorded. This gives aquick and accurate check of system performance by allowing a comparison ofpresent operation to its operation when new. Gradually changing readings canbe quickly spotted by this method, and used to forestall developing problems.

Note

To prevent damage to receiver circuits, the input ac power should bedisconnected when removing or replacing PC Boards.

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REY DESCRIPTION DR DATE APPO

A puor- EEL EASE 2 -/6-13P2oP .2.e 1-- e /9SE

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a. AC YOL7A-GE TYPICAL VOLTAGES Foe f mVia F INPUT

7. 1-1 PC VOLTAGE

4. ALL PC MEASUZEMENTs MADE WITH NO ZF INPUT

S. .edc,.-"; "'co' .4.5-rY 6608-3307.6.47 /64,0-3347

POINTED mice° STZ/F. COMPONENTS

lkIDUCTOZ VALUES AEE mIceoHEiveicsCAPACITOZ VALUES AEE miceoFmemos

/ OESISTOE VALUES .42E /Ai 01-44IS 1/4W ± 5/.NOTES: LIA/LESs OTI-IEEvV 'SE SPEC/FIFO

sot -1X

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8301 6608-3347MODEL NEXT ASSY


ANGULAR-

DECIMAL-S PLACE

3 PLACE ± -BREAK- .010IAIN

SURFACE ROUGHNESS-- MICAOINCNES RMS.MAX.

DIAMETERS -CONCENTRICWITHIN .005 Till.

FILLET RADIUS- - MAXTHREADS- CLASS 2MARK IN ACCORDANCEWITH TFT SPEC 53001051

MATERIAL 3090 OAKMEAD VILLAGE DR.SANTA CLARA, CA. 95051

, ;ME 11081 727.1272 MIX 910338.0581

FINISH

OR. 11Y -N.

CK. BY.

2-/L-V3

ENG r/

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CODE WENT NO. SIZE

D

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C

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3

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,r,..04.4c.L. 7 el/ j 2

SCALE - DO NOT SCALE PRINT I SHEET / OF /

1

I 3 ItoThis document conteine prorletery Information andIs delivered upon the expressed condition that It willnot be used directly or Indirectly In any way detri-mental to the Interest of TFT Inc.

COLLECTOE(LORI EST LEAD),Q4 AMP QZ

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I FOC MATL LIST _SEE G&08- 3347 (LATEST PEV )NOTES: MILE S'S OTHEEWISE _SCEeIFIE.D

REVISIONS


A

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teev/ -t -e0 DER Eco /.38

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5301 5102- 3.37!MODEL NEXT ASSY


ANGULAR= ±

DECIMAL -2 PLACE +3 PLACE ±

BREAK= .010MIN

SURFACE ROUGHNESS=MICROINCHES RMSMAX.

DIAMETERS = CONCENTRICWITHIN .005 TIR.

FILLET RADIUS=-

MAX

THREADS= CLASS 2MARK IN ACCORDANCEWITH TFT SPEC 5300-1058

MATERIAL 3090 OAKMEAD VILLAGE DR.I MI I SANTA CLARA, CA. 95051I LINE mow 727-7272 TWX 910-3380584

FINISH

OR. 3-11-13

1- PC BOAED ASSEMBLY -FeCiAlT LAID

CK. BY. CODE WENT NO.

MFG.

G.A. 57),e4tAIA,_

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SIZE

C

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6G08- 334-1REV.

DO NOT SCALE PRINT I SHEET /APPLICATION

4 3

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2 ,4: i.4 5720/,71

Model 8301 Front End Bd. Assembly 16608-3347Rev. C


Cl Cap Cer Disc .01uF 7 1005-1039C2 Cap Electrolytic 25v 10uF 4 1010-0099C3 Cap Chip 220pF 1 1009-2200C4 Printed CapC5 Cap Electrolytic 25v 10uF 1010-0099C6 Cap Chip 1000pF 4 1009-1002C7 Cap Cer Disc .01uF 1005-1039C8 Cap Chip 1000pF 1009-1002C9 Cap Chip 1.5pF 2 1009-0015C10 Cap Cer Disc .01uF 1005-1039C11 Cap Elect 25v 10uF 1010-0099C12 Printed CapC13 Cap Elect 25v 10uF 1010-0099C14 Cap Chip 1000pF 1009-1002C15 Cap Chip 1000pF 1009-1002C16 Cap Chip I.5pF 1009-0015C17 Cap Mica 180pF 2 1001-0181C18 Cap Mica 36pF 2 1001-0360C19 Cap Cer Disc .01uF 1005-1039C20 Cap Cer Disc .01uF 1005-1039C21 Cap Cer Disc .01uf 1005-1039C22 Cap Mica 36pF 1001-0360C23 Cap Mica 180pF 1001-0181C24 Cap Cer Disc .01uF 1005-1039

CR1 Diode 184001 1 1284-4001

RI Resistor Car Comp I/4w 5% 91 2 1065-0091R2 Resistor Car Comp 1/4w 5% 75 1 1065-0075R3 Resistor Car Comp 1/4w 5% 91 1065-0091R4 Resistor Car Comp 1/4w 51 8.2K 2 1065-8201R5 Resistor Car Comp 1/4w 5% 10K 3 1065-1002

"

R6 Resistor Car Comp 1/4w 5% 4.7K 2 1065-4701R7 Resistor Car Comp 1/4w 5% 1.2K 1 1065-1201R8 Resistor Car Comp 1/4w 5% 8.2K 1065-8201R9 Resistor Car Comp 1/4w 5% 10K 1065-1002RIO Resistor Car Comp 1/4w 5% 4.7K 1065-4701811 Resistor Car Comp 1/4w 5% 390 1 1065-0390R12 Resistor Car Comp 1/4w 5% 27 1 1065-0027R13 Resistor Car Comp 1/4w 5% 15K 1 1065-1502R14 Resistor Car Comp 1/4w 5% 10K 1065-1002RI5 Resistor Car Comp 1/4w 5% 3K 1 1065-3001R16 Resistor Car Comp 1/4w 5% 18K 1 1065-1802

Page 1 of 2

Model 8301 Front End Bd. Assembly 6608-3347

CKT REF DESCRIPTION QTY TETT STOCK NO.

LI Printed InductorL2 Printed InductorL3 Printed InductorL4 Printed InductorL5 Inductor UAR 4 Turn 2 1550-0010L6 Inductor UAR 4 Turn 1550-0010

01 Transistor 284121 2 1271-4121Q2 Transistor MRF901 2 1274-0901Q3 Transistor 284121 1271-4121Q4 Transistor MRF901 1274-0901Q5 Transistor SD306 1 1100-6306

Cl Relay 1 1880-0016

Ferrite Beads (as required) 4 1501-0654

21 Mixer SRA2CM 1 4500-0003

J1 Conn Sub min SO Ohm I 2200-0004

PC Board1 1600-3347

Solid Pin Plug 4 2140-0071

Page 2 of 2

TN. 00.011.1 contains pro0elayy 1.100,11011 And0.110.1.0 upon IM expiessa0 C00011. 111111 1 Y.

1101 0. ua.0 0110017 01 0010.10 in any .y 0.111.m.11a1101M inimes1 01 T FT Inc

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,Pe,,," GCB .4.5"..ry 6608-33756.42 /6oc,-3375

D. IAJDUCTOIL VALUES AOE MICE.OHEAJOIES

2. CAPACITOZ VALUES ACE IN MICEOFAL'Al7.5I . CESISTOZ. VALUES ACE IN 01-014.5

NOTES' UNLESS OTHEZWISE SPECIFIED

7 6

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REVISIONS

REV DESCRIPTION DA DATE APPO

A PEO C7. EEL-E.H.WE I S-/313Q51 e49150,-/ 400&-r3

C ,eep,/sezo eco ZO rc'e,c'Eces /6573

F

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f3 3 0c, 6608-33758301 660E3-3375

MODEL NEXT ASSY

APPLICATION


ANGULAR. 0 -DECIMAL.

PUCE3 PLACE 0 -

BREAK..010MINSURFACE ROUGHNESS.

- MICADINCNES VMS MAXDIAMETERS .CONCENTRIC

WITHIN .00S TIR.

FILLET RADIUS. - MAXTHREADS- CLASS 2MARE IN ACCORDANCEWITH TFT SPEC 530010241

3

MATERIAL 3090 OAKMEAD VILLAGE OR.

j INI, If SANTA CLARA. CA. 95051_ I ,Jg NM 727-7272 TYI X 910338.0580

FINISH

ENGR.

MFG.

0 A

3

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D -3375SCALE - 00 NOT SCALE PRINT 1 SHEET / O ,C /

1

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FOE- MATL LIST SEE 6,605- 3375

REVISIONS

WM REV. DESORPTION DATE APPROVED

A ZELERSE 5:- 4,2 -4,3

B A/4Co P191,5 ADDED 4-2743C CPS, ecA9, e st) MDDEa 7O ,ecv, se-49,ce7C Ee0/622 g - Yec- ,e_e-Vz.5-e0* PER Ec-G./6 56,0 -2 -S -8Y

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NOMENCLATUREOR DESCRIPTKIN


PARTS LIST

5/02-3365 53 ca -c2

UNLESS OTHERWISE SPECIFIEDDIMENSIONS ARE IN INCITESTOLERANCES ARE:

FRACTIONS DECIMALS ANGLESAX t

.XXX

CONTRACT NO.

11711177ME& FREQUENCY

TECHNOLOGY INC

5/02 -3371NEXT ASST

830 /APPLICATION

USED ON

MATERIAL

FINISH


APPROVALS DATE

DRAWN

ISSUED

2 1-12-13PCB SSEMBLY

LOCK UPCO/VVEETEESIZE FSCM NO.

CSCALE 2/I

DWG. NO. REV.- 5375 6SHEET F t

A

REORDER .Arm

4 3A

2<in< ex -o -

Model 8300LOCK UPCONVERTER L.O.

Assembly #6608-3375

REV. G


R1 RESISTOR CAR COMP. 1/4W 5% 2.4K 1 1065-2401

R2 RESISTOR CAR COMP. 1/4W 5% 560 1 1065.0560R3 RESISTOR CAR COMP. 1/4W 5% 470 1 1065-0470R4* RESISTOR CAR COMP. 1/4W 5% 10K 5 1065-1002

R5 RESISTOR CAR COMP. 1/4W 5% 620K 1 1065-6203

R6 RESISTOR CAR COMP. 1/4W 5% 10K 1065-1002R7 RESISTOR CAR COMP. 1/4W 5% 100K 2 1065-1003R8 RESISTOR CAR COMP. 1/4W 5% 47K 1 1065-4702R9 RESISTOR CAR COMP. 1/4W 5% 10K 1065-1002R10 RESISTOR CAR COMP. 1/4W 5% 100K 1065-1003R11 RESISTOR CAR COMP. 1/4W 5% 82K 1 1065-8202

R12 RESISTOR CAR COMP. 1/4W 5% 4.7K 4 1065-4701

R13 RESISTOR CAR COMP. 1/4W 5% 3.3MEG 1 1065-3304R14 RESISTOR CAR COMP. 1/4W 5% 2.2K HI REL 1 1062-2201R15 RESISTOR CAR COMP. 1/4W 5% 470 HI REL 1 1062-0470

R16 RESISTOR CAR COMP. 1/4W 5% 1K HI REL 2 1062-1001R17 RESISTOR CAR COMP. 1/4W 5% 1K HI REL 1062-1001R18 RESISTOR CAR COMP. 1/4W 5% 27 HI REL 2 1062-0027R19 RESISTOR CAR COMP. 1/4W 5% 39 HI REL 1 1062-0039R20 RESISTOR CAR COMP. 1/4W 5% 18 HI REL 1 1062-0018R21 RESISTOR CAR COMP. 1/4W 5% 22 HI REL 2 1062-0022R22 RESISTOR CAR COMP. 1/4W 5% 22 HI REL 1062-0022R23 RESISTOR CAR COMP. 1/4W 5% 56 HI REL 1 1062-0056R24 RESISTOR CAR COMP. 1/4W 5% 27 HI REL 1 1062-0027

R25 NOT USEDR26 RESISTOR CAR COMP. 1/4W 5% 56K 2 1065-5602R27 RESISTOR CAR COMP. 1/4W 5% 56K 1065-5602R28 RESISTOR VARIABLE 20T 2K 1 1072-2000R29 RESISTOR CAR COMP. 1/4W 5% 4.7K HI REL 2 1062-4701R30 RESISTOR CAR COMP. 1/4W 5% 4.7K HI REL 1062-4701R31 RESISTOR CAR COMP. 1/4W 5% 220 HI REL 2 1062-0220R32 RESISTOR CAR COMP. 1/4W 5% 220 HI REL 1062-0220R33 RESISTOR CAR COMP. 1/4W 5% 68 HI REL 2 1062-0068R34 RESISTOR CAR COMP. 1/4W 5% 68 HI REL 1062-0068R35 RESISTOR CAR COMP. 1/4W 5% 100 HI REL 1 1062-0100R36 RESISTOR CAR COMP. 1/4W 5% 2.7K HI REL 1 1062-2701R37 RESISTOR CAR COMP. 1/4W 5% 3.9 HI REL 1 1062-0003R38 RESISTOR CAR COMP. 1/4W 5% 47 1 1065-0047R39 RESISTOR CAR COMP. 1/4W 5% 56 1 1065-0056R40 RESISTOR CAR COMP. 1/4W 5% 1.8K HI REL 1 1062-1801R41 RESISTOR CAR COMP. 1/4W 5% 470 HI REL 1 1062-0470R42 RESISTOR CAR COMP. 1/4W 5% 1.2K 1 1065-1201

R43 RESISTOR CAR COMP. 1/4W 5% 22 1 1065-0022R44 RESISTOR CAR COMP. 1/4W 5% 390 1 1065-0390R45 RESISTOR CAR COMP. 1/4W 5% 4.7K 1065-4701

R46 RESISTOR CAR COMP. 1/4W 5% 4.7K 1065-4701R47 RESISTOR CAR COMP. 1/4W 5% 82 HI REL 1 1062-0082R48 NOT USEDR49* RESISTOR CAR COMP. 1/4W 5% 4.7K 1065-4701R50* RESISTOR CAR COMP. 1/4W 5% 10K 1065-1002R51* RESISTOR CAR COMP 1/4W 5% 10K 1065-1002

Page I of 3


Assembly #6608-3375

REV. G


CI CAP ELECT 25V 1OUFD 3 1010-0099

C2 CAP ELECT. 25V 10UFD 1010-0099

C3 CAP MONO .1UFD 5 1016-0010C4 CAP MONO .1UFD 1016-0010C5 CAP MICA 180PF 1 1001-0181

C6 CAP MINI CERAMIC NPO 100V 5.6PF 3 1005-0055

C7 CAP MONO .1UFD 1016-0010

C8 CAP MONO .1UFD 1016-0010

C9 CAP VARIABLE 1-14PF 1 1012-0020

C10 CAP MINI CERAMIC NPO 63V 10PF 5 1005-0011

C11 CAP MINI CERAMIC NPO 100V 3.3PF 1 1005-0032

C12 CAP MINI CERAMIC NPO 63V 10PF 1005-0011



C15 CAP MINI CERAMIC NPO 100V 5.6PF 1005-0055

C16 CAP MINI CERAMIC NPO 100V 5.6PF 1005-0055

C17 CAP CK0513X 560PF 2 1015-0560

C18 CAP CERAMIC 100PF 1 1015-0100

C19 CAP MINI CERAMIC NPO 63V 33PF 1 1005-0012


C21 CAP CK05BX 560PF 1015-0560C22 CAP VARIABLE 1-14PF 1 1012-0814

C23 CAP CER .Z2MF CK068X K 1 1015-0003

C24 CAP MONO .1UF0 1016-0010

C25 NOT USEDC26 CAP CHIP 3PF 7700 1 1009-0030

C27 CAP ELECT 25V 1000FD 1 1010-0110

C28 CAP ELECT 25V 1000FD 1010-0099

LI CHOKE RF .150HY 2 1531-0015

L2 CHOKE PF .12UHY 1 1531-0012

L3 CHOKE RF .33UHY 1 1531-0033

L4 CHOKE RF .18UHY 1 1531-0018

L5 CHOKE RF .15OHY 1531-0015

L6 CHOKE RF 1UHY 1 1530-0010

CR1 DIODE 1N3064 2 1281-3064

CR2 DIODE IN3064 1281-3064

CR3 VARICAP 813105G 2-16PF 1 1290-0105CR4 DIODE HP2810 2 1283-2810CR5 DIODE HP2810 1283-2810CR6 DIODE A4S112 1 1282-0112CR7 NOT USEDCR8 NOT USED

T1 TRANSFORMER 1 1501-0008

Page 2 of 3


Assembly #6608-3375

EV . G


01 TRANSISTOR 2N5087 1 1271-5087

Q2* TRANSISTOR 2N5089 1 1271-5089

Q3* TRANSISTOR 11P-32 1 1272-0525

Q4 TRANSISTOR BFR95 1 1271-0095

Q5 TRANSISTOR 2N5109 1 1271-5109

Q6 TRANSISTOR PN918 2 1271-0918

Q7 TRANSISTOR PN918 1271-0918

08* TRANSISTOR 2N3565 1 1271-3565

Ui I.C. L1-353 1 1100-0353

Y1 XTAL 8/.65MHZ 1 2400-8765

I.C. SOCKET 8 PIN 1 2250-1008

H1* CRYSTAL HEATER PCL1-43 1 2450-0004

PCB 1 1600-3375

SOLID PIN PLUG 9 2140-0071

* R4, R49, R50, R51, Q2, Q3, Q8, AND HIARE NOT USED ON MODEL 8301.

Page 3 of 3

REVISIONS

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REVISIONS


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DESCRIPTION DR DATE

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MATERIAL .,r 3090 OAKMEAO VILLAGE DR.

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FRACTIONS DECIMALS ANGLES.XX.xxx

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MATERIAL

ANGULAR= ± -DECIMAL=

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770 7 6608 -3331-WITHIN .005 TIR.

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PIM MN, 3090 OAKMEAD VILLAGE DR., IN! SANTA CLARA, CA. 95051

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Page

1 of 1

ThIS document contains prorletary Information andis delivered upon the expressed condition that It willnot be used directly or Indirectly In any wey chart.mental to the interest of TFT Inc.

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FILLET RADIUS-

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Model 8301 SYSTEM WIRING DIAGRAM As embly 06600-2244Rey.0

Ca REF DESCRIPTION QTY TFT STOCK NO.

Filter Fuse Holder 1 1910-0006Fuse - 158 SB 1 1900-0012Conn BNC CH. MT. 3 2200-7935

Binding Post 1 2260-0002

Transformer Assy 1 5102-3381RF Filter 1 1052-0018PCB Connector 1 2250-8902

Page of 1

P/N 5004-7773REVISION DDATE Nov. 86

EnUIPMENT SERIAL NO. //P9 14 /

SHIPMENT DATE Dmi 4 1989

PART E

MODEL 7773 RECEIVER AUTOMATIC CHANGEOVER

TFT, INC.3090 Oakmead Village DriveSanta Clara, CA 95051

TEL (408) 727-7272 TWX 910-338-0584FAX (408) 727-5942

TABLE OF CONTENTS

Page

SECTION El GENERAL INFORMATION E1-1

E1.1 General Description E1-1E1.2 Specifications E1-1

SECTION E2 INSTALLATION E2-1

SECTION E3 OPERATION E3-1

SECTION E4 THEORY OF OPERATION E4-1

E4.1 General E4-1E4.2 Switch Board Schematic Diagram Discussion E4-1

SECTION E5 MAINTENANCE

SECTION E6 DIAGRAMS

SECTION El

GENERAL INFORMATION

E1.1 General Description

The Model 7773 Automatic Changeover is used in an STLNot Standby Receiver System to automatically switch the audio output fromthe operating receiver to the standby if there is a failure of either thepower supply voltages or the received signal level in the operating receiver.

The Model 7773 is 1 3/4" high and mounts in a standard19 -inch relay rack at the transmitter site.

E1.2 Specifications

Power RequiredTemperature RangeDimensionsWeight

+12y dc (supplied by receivers)-10 to +50'C1 3/4 x 8 x 173 Lb.

SECTION E2

INSTALLATION

Installation instructions for the Model 7773 AutomaticChangeover Unit are contained in Section A2 of Part A of this manual.

E2-1

7

SECTION E3

OPERATION

Operating instructions for the Model 7773 AutomaticChangeover Unit are contained in Section A3 of Part A of this manual.

E3-1

SECTION E4

THEORY OF OPERATION

E4.1 General

The Model 7773 Automatic Changeover monitors the powersupply voltages and the RF signal levels in the two receivers, and switchesthe audio output from the receiver in use to the standby receiver if thereis a failure of either the supply voltages or the signal level in the re-ceiver in use (see Drawing No. 6600-2203). The unit also provides the cir-cuitry for switching audio output from one receiver to the other by means

of a front -panel switch. Power supply switching has top priority, manualswitching second priority, and RF level switch third priority. That is,receivers will be switched whenever there is a failure of the power supplies

in the receiver in use. Manual switching cannot override a switch made forfailed power supplies, but can switch to a receiver even though its RF signal

level is below the acceptable value. Switching for low RF signal level cantake place only if the power supply for the receiver -to be switched to is

operating properly.

The Automatic Changeover unit contains two major com-ponents -- the Splitter Board and the Switch Board. The Splitter Board is

an RF power splitter that allows the two receivers to operate from the same

antenna. All of the monitoring and control is done by the Switch Board,which is described in subsection E4.2.

E4.2 Switch Board Schematic Diagram Discussion(Drawing No. 6601-3309)

The -12 V input from Receiver A at pin 1 of J1 normallykeeps Ql turned off, and thus delivers a logic 1 to pin 15 of U4. If, how-

ever, the -12 V supply fails, Q1 is turned on and delivers a logic 0 to pin

15 of U4. Likewise, the normal +12 V input from Receiver A causes Q2 andQ3 to deliver a logic 1 to U4-15, but a failure of the +12 V supply deliversa logic 0 to U4-15.

In the same way, the power supplies from Receiver B areapplied to the circuitry of Q4, Q5, and Q6 to deliver a logic 1 to pin 1 ofU4 if the power supplies are operating, and a logic 0 to U4-1 if they are not.

U4 is a magnitude comparator which outputs a high at pin 5and a low at pin 7 whenever an A input is greater than its paired B input(e.g., Al greater than BO. Also, a high at pin 7 and a low at pin 5 areproduced when a B input Is greater than an A input. If inputs A3 -B3 then the

E4.2 Continued

output would depend on the next pair of inputs (A2 and B2). The A3/B3pair has the highest priority; that is, A3 7B3 will produce a 1 at pin

5 regardless of the values of A2/B2, Al/B1, and A0/B0. A0 Bo will pro-

duce a 1 at pin 5 and a 0 at pin 7 only if A3=83, A2=A2, and A1=131. All

inputs could be logic 1 or (A=B) except A0 and Bo. There are only twocases for AD and Bo, either A0780 or Ao<B0 because of U2 (RS-FF). This

assures that pin 5 and 7 would never be equal.

When U4 outputs a logic 1 at pin 5 (A B), it turns onQ10 which de -energizes a relay in Receiver B and thus switches off theReceiver B audio output. Q10 will also short pin 2 of J3 to ground andthus light the front -panel RxA LED. While pin 5 of U4 is high, pin 7 of

U4 will be low. This low turns off Q9, which causes a relay in Receiver Ato energize and thus switch on the Receiver A audio. If B is greater than

A, U4-7 outputs a logic 1 to cause Q9 to switch off Receiver A and turnon the RXB LED. U4-5 will be low, turning off Q10 and thus energizing theaudio output relay in Receiver B.

The front -panel switch can also be used to switch re-

ceivers. The switch is normally in the center -off position, which permitsautomatic switching for failed power supplies or low RF signal. If the

switch is moved to the RxA position, a ground is placed on pin 7 of J3,delivering a logic 0 to U4-14. Since this makes A2 greater than B2, U4-7will be low (provided the power supplies of both receivers are operatingnormally so that A3=B3); and the low at U4-7 turns on the audio outputfrom Receiver A as described in the preceding paragraph. If the front -panel

switch is moved to the RxB position, the resulting low at U4-13 turns on theReceiver B audio.

RF signal failure in the receiver in use can also causethe Switch Board to switch to the other receiver. A TTL input from a squelccircuit in Receiver A is brought into the board at pin 6 of Jl; this inputis +12V if the received signal level is above 40 UF, and -12 if the receivedsignal level is below that value. When the Receiver A received signal isgood, the low at the collector of Q8 is delivered through U1-11 as a high toU4-12. Likewise, a good received signal in Receiver B produces +12V atJ2-6, which is delivered through Q7 and U2-3 to U4-11 as a high. If, forexample, Receiver B has RF failure, then Q7 would be logic 1; therefore, itresults U4-11 a logic 0 and U4-12 a logic 1, or Al will be greater than Blat the input to U4, and the Receiver A audio output will be selected.

Whenever A becomes greater than B at any pair of inputsto U4, pin 7 of U4 goes low, setting the latch consisting of U2-8 and U2-11.As a result, pin 8 of U2 is high and pin 11 of U2 is low, making AQ> Bo atU4 and holding U4-5 high and U4-7 low. This state continues even if A=Bfor the other three input pairs to U4; only if B becomes greater than A inone of the pairs, resetting the latch, does B0 become greater than A0 to

I

E4.2 Continued

allow the U4 output to change. The purpose of this action is to prevent an

automatic switch in receivers when RF level or power supply voltages are re-

stored following a failure.

If the RF signals in both receivers fail, the collectors

of Q7 and Q8 will go high causing U1-3 to go low. Timer U5 runs continuously,

producing a 1 -second square wave at U5-3. The low at U1-3 is inverted by

U1-6 to gate the square wave through U1-8 to U2-1, causing the Receiver B

level at U4-11 to go alternately high and low every half second. The U2-3

output also gates the Receiver A level from the collector of Q8 through U1-11

to U4-12 every half second. Because of the inversion in U1-11, the levels

at pins 11 and 12 of U4 are 180 degress out of phase. Thus the receivers are

switched back and forth until one receiver regains its RF signal, at which

time U1-8 gates off the square wave and operation switches to the good receiver.

Power for the Switch Board at 5V dc is obtained from the

+12V supplies of both receivers through diodes CR3 and CR4 and regulator U3.

Thus the board will continue to operate even if one +12V supply fails.

E4-3

SECTION E5

MAINTENANCE

Maintenance instructions for the Model 7773 Automatic Changeoverare contained in Section D of Part 0 of this manual.

E5-1

SECTION E6

MODEL 7773 AUTOMATIC CHANGEOVER DIAGRAMS

DESCRIPTIONDRAWING NO.

Interface Switch Board6601-3309

Parts List and PCB Assembly6608-3309

Splitter Board6601-3316

Parts List6608-3316

E6-1

DWG LGO1 -I I

REVISIONS

D

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RE DESCRIPTION DATE APPROVED

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1. RESISTOR VALUES ARE IN OHMS -1/411)-!

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CONTRACT NO.

TER TIME & FREQUENCYTECHNOLOGY INC

APPROVALS DATE

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CONTRACT NO.

frEETIME& FREQUENCYTECHNOLOGY INC

APPROVALS DATE

12 29 1

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C7 Cap Elect. Vert Ent 35V 10uF 2 1010-0099C8 Cap Diac Cer .01 2 1005-1039C9 Cap Disc Cer .01 1005-1039C10 Cap Elect. Vert Ent 35V 10uF 1010-0099

CR1 Dio 194001 5 1284-4001CR2 Dio 194001 1284-4001CR3 Dio 194001 1284-4001CR4 Dio 194001 1284-4001CR5 Dio 104001 1284-4001

J3 Connector Molex 7 Pin 1 2250-6007J4 Connector Molex 2 Pin 1 2250-6002

01 Trans 294275 8 1271-427502 Trans 2N4275 1271-427503 Trans 294275 1271-427504 Trans 294275 1271-427505 Trans 2N4275 1271-4275Q6 Trans 204275 1271-4275Q7 Trans 204275 1271-4275Q9 Trans 202222 2 1271-2222010 Trans 202222 1271-2222

RI Res 1/4W 5% Carb.Comp 271 2 1065-2702R2 Res 1/4W 5% Carb. Camp 12K 2 1065-1202R3 Res 1/4W 5% Carb Comp 4.7K 13 1065-4701R4 Res 1/4W 5% Carb. Coop 2K 3 1065-2001R5 Res 1/4W 5% Carb. Comp 4.7K 1065-4701R6 Res 1/4W 5% Carb.Comp 108 2 1065-1002R7 Res 1/4W 5% Carb. Comp 11 2 1065-.001R8 Res 1/4W 5% Carb.Comp 271 1065-2702R9 Res 1/4W 5% Carb.Comp 12K 1065-1202R10 Res 1/4W 5% Carb.Comp 4.7K 1065-4701RI1 Res 1/4W 5% Carb. Camp 28 1065-2001R12 Res 1/4W 5% Carb.Comp 10K 1065-1002R13 Res 1/4W 5% Carb.Comp 4.7K 1065-4701R14 Rea 1/4W 5% Carb. Coop 1K 1065-1001R15 Res 1/4W 5% Carb. Comp 15K 2 1065-1502R16 Res 1/4W 5% Carb.Comp 4.7K 1065-4701R17 Res 1/4W 5% Carb.COmp 4.71 1065-4701R18 Res 1/4W r".4 Carb. Comp 15K 1065-1502R19 Res 1/4W 5% Carl. Cmop 4.7K 1065-4701

Page i of 2


R20 Res 1/4W 5% Carb. Comp 4.78 1065-4701R21 Res 1/4W 5% Carb. Comp 4.71 1065-4701R22 Res 1/4W 5% Carb. Comp 4.7K 1065-4701R23 Rea 1/4W 5% Carb. Coins 4.7K 1065-4701R24 Res 1/4W 5% Carb. Comp 4.71 1065-4701R25 Res 1/4W 5% Carb. Comp 2K 1065-2001R26 Res 1/4W 5% Carb. Comp 4.71 1065-4701R27 Rea 1/4W 5% Carb.Comp 21 1065-2001R28 Res 1/4W 5% Carb. Comp 8.2K 1 1065-8201R29 Res 1/4W 5% Carb. Comp 68R 1 1065-6802R30 Rea 1/4W 5% Carb. Comp 300 2 1065-0300R31 Res 1/4W 5% Carb. Comp 300 1065-0300R32 Res 1/4W 5% Carb. Comp 471 2 1065-4702R33 Res 1/4W 5% Carb. Comp 471 1065-4702

Ul IC 74L0001 2 1101-7400

U2 IC 74L600 1101-7400U3 IC 340-5 1 1101-7805U4 IC 74LS85 1 1101-7485U5 IC NE555 1 1100-0555

Interface Switch PCB 1 1608-3109

Page 2 of 2

IDWG. NO.1SH I

REV. I

TYPE KI

ANT 0 SPLITTERPSC-2-4

REVISIONS


TYPE 1.1

® RXA

TYPE eV

0 R X B

A E/1/6/2 /1)//4-/6/ /(.(-;141

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PARTS LIST

UNLESS OTHERWISE SPECIFIEDDIMENSIONS ARE IN INCHESTOLERANCE!? ^RE!

FRACTIONS JECIMALE ANGLES.XX.XXX

CONTRACT NO.

frEETIME& FREQUENCYTECHNOLOGY INC

6(2,05- 33i6 7773


NEXT ASSY USED ON

FINISH

DRAWN)oe. 7/61415444,CHECKED

ISSUED

, ,277/(' )- 2-4

SPLITTER SCHEMATICSIZE

BFSCM NO. DWG. NO.66a/-33/6 REV.

Al%

APPLICATION DO NOT SCALE DRAWING SCALE SHEET I OF I

fri BISHOP GRAPHICS/ACCUPRESSREORDER NO. A4105

4 3 2

This document contains prorietary information endIs delivered upon the expressed condition that It willnot be used directly or indirectly In any way detri-mental to the interest of TFT Inc.

31

ANTS.

72r -

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73

-77-73MODEL NEXT ASSY

REVISIONS


A 0/vPri rriEL.er 9 .5E

Pa -23 /1000 - 3.3/ &,.5c, -/E -A4 4,07 -33/C0


ANGULAR. ±DECIMAL -

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SURFACE ROUt ESS.MICR CHES RIAS:MAX.

DIAMETER -CONCENTRICWITH .005 TIR.

FILL RADIUS- MAX

ADS- CLASS 2RK IN ACCORDANCE

TH TFT SPEC 5300-1058

ss /2//44

ITEM OTY

MATERIAL


rIsow pm 3090 OAKMEAD VILLAGE DRII SANTA CLARA, CA. 950511

, Mr (408) 727-7272 TVV X 910-338-0584

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Page 1

of1

P/N 5004-8300REVISION D

DATE 9-24-86EOUIPMENT SERItt NC.SHIP'AENT DATE

T F T

STEREO DECODER BOARD OPTION

PART F

TFT, INC.3090 oakmead Villane DriveSanta Clara, CA 25051

TEL (408) 727-7272 TWX 91(-338-'584FAX (40e) 727-5942

SECTION F

Stereo Decoder Board Option

TABLE OF CONTENTS

Page

SECTION Fl GENERAL INFORMATION F1-1

F1.1 System Description F1-1

F1.2 Specifications F1-1

SECTION F2 INSTALLATION F2-1

F2.1 Unpacking and Inspection F2-1

F2.2 Installation and Connection F2-1

F2.3 Adjustment F2-1

SECTION F3 OPERATION F3-1

F3.1 General F3-1

F3.2 Controls and Operations F3-1

DWG NO.

SECTION F4 DIAGRAMS

Figure Fl - Block Diagram 6600-2288

Figure F2 - Schematic 6601-3370


SECTION F

GENERAL INFORMATION

F1.1 System Description

The TFT stereo decoder option B for use at the broadcasttransmitter in the 8301/7707 STL receiver to demodulate composit audio intoseparate left and right audio outputs. The option is a single PC Board whichmounts into a ten pin molex connector, J8, or J9, on the receiver main board.

F1.2 Stereo Decoder Option

Distortion <0.5% at 1 KHz

S/N >60 dB

Stereo Separation >40 dB 50 Hz to 10 KHz

Frequency Response +1 dB 50 KHz to 12.5 KHz

Output level +10 dB (600 ohm Load)

F1-1

SECTION F2

INSTALLATION

F2.1 Unpacking and Inspection

Upon receiving the option, inspect the packing box andboard for signs of possible shipping damage. Keep all packing material untilperformance is confirmed. If anything is damaged or missing, file a claim withthe transportation company, or with the insurance company if insuredseparately.

F2.2 Installation and Connection

The stereo decoder board is designed to be plugged into the8301 or 7707 main board, J8 or J9 Molex connector, which is located at therear, right side of the main board as facing the unit. Although the space isminimal, the board will fit without removing the coaxial filter on rear panel.The component side of the stereo decoder board should face away from the RFcasting when the installation is complete.

After installing the board, all the necessary connectionsare made interfacing the stereo decoder board to the main board. The rear

panel connections on the 8301 are as follows: Left "+" output, pin 1 on J5.

Left "-" output, Pin 2 on J5. Right "+" output, pin 3 on J5. Right "-"output, pin 4 on J5. All outputs are ment to be terminated into a 600 ohmload. On the 7707 the Left "+" output is J2-8. Left "-" is J2-9. Right "-" is

J2-10. Right "+" output is J2-11.

The installation of the stereo decoder board option is nowcomplete.

F2.3 Adjustment

Modulate both channels of the stereo generator with a 400Hz signal. With an oscilloscope connected in the X -Y mode, to the right andleft channel outputs of the 8301/7707. Adjust R15 for a single line on thescope. This indicates both signals are perfectly in phase. Adjust R24 for theleft channel for proper output level. Any adjustment of R3 or R7 will

degrade the performance of the stereo decoder.

OUT OF PHASE IN PHASE

NF2-1

180° OUT OF PHASE

SECTION F3

OPERATION

F3.1 General

Composite audio from the main board enters the stereodecoder board at J8 or J9 pin 6 and on to pin 2 of U1. Ul is a highperformance PLL FM stereo demodulator with a pilot cancel feature.Potentiometer R is used to effectively null the 19kHz pilot signal in thedemodulator IC which has very little phase shifting effect on the audio. This

contributes to the options' low distortion characteristics.

F3.2 Controls and Operation

Control R7 adjusts the VCO frequency, which is set at thefactory to 76kHz.

The left and right audio output signals then go through a15kHz low pass filter which removes any remaining 19kHz and 38kHz signals.

The left channel then goes through U2, which is a fixeddelay buffer amplifier. The right channel goes through a variable delay bufferamplifier, U4. Potentiometer R15 is the variable delay and is used to adjustsignal phase. It is used to maximize the stero decoders stereo separation andcompensate for any delays that might be encountered.

The left channel then goes into U3, which 1/2 is usedfor a non -inverting output and the other 1/2 is used for an invertingoutput. The level of both inverting and non -inverting amplifiers is controlledby R28 which controls gain. The right channel operates in the same mannerusing U5. R24 is the right channel's output level adjustment potentiometer.

The left channel "+" output is J8 pin 7, the "-" is pin 8.The right channel "+" output is J8 pin 10, and the "-" is pin 9. In the 7707the stereo board connector is J9.

Located on the P.C. Board is a light emitting diode, CR1.This L.E.D. indicates the reception of a 19kHz tone and turns on when a stereosignal is being received.

F3-1

IDWG. NO. ISH IREV.

1

STEREO

15

LOW PASS

kHz

FILTER AMPLIFIER

FIXED INVERTINGDELAY AMP

NETWORKCOMPOSITE DECODER

INPUT

15 kHzLOW PASS FILTER AMPLIFIER

VARIABLEDELAY

NETWORK

INVERTINGAMP

REVISIONS


A PROD. RELEASE

LEFT CHANNEL OUTPUT

RIGHT CHANNEL OUTPUT

MIN

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PARTS LIST


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SCHEMATIC--.- 5TEZEO DECODE

CODE SENT NO.

7P4 7,4/i). SCALE -

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4 3 2 1

This document contains prorietery Information andIs delivered upon the expressed condition that 11 willnot be used directly or indirectly In any way detri-mental to the Interest of TFT Inc.

C

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REVISIONS


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NOTES' UNLESS OTHEWWISE SPECIFIED

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TK/4-^15ici 1 -7-7--,f R. 5 /7---E Coi · The STL system makes it possible to transmit a composite...

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