1

VTE-1

Voting Tone Encoder

Manual Revision: 2011-08-26 Covers Loader Firmware Revisions: 1.70 & Higher Covers Application Firmware Revisions: 1.40 & Higher Covers PCB Revisions: F

2

TABLE OF CONTENTS Specifications 3 General Information 4 Hardware Installation 5 Hardware Alignment 6 Jumper Settings 7 Controls & Indicators 8 Operation 8 Theory of Operation 9 Technical Notes 10 Contact Information 10

3

SPECIFICATIONS

Voltage/Current: Operating Voltage: 13-18 VDC Operating Current (standby): 125 mA LED Current: 4 mA Fuse Protection Auto Resettable with surge suppression: 300 mA

RX Input from Radio: Frequency Range: 300-3000 Hz Notch Filter Depth: 45 db relative to 1 KHz Dynamic Range 30 dB COR Input Logic Low Dedicated Phone Line: Output Level -20 to +10 dB pot adjustable Output Impedance 600 Ohm Fuse Protection Auto Resettable with surge suppression: 300 mA

Mechanical: Dimensions: 1.45" H x 6” W x 7.6" L Operating Temp: 0° to +50° C Default Pilot Tone Frequencies: 1950 Hz (default) 2175 Hz 2700 Hz 1600 Hz No Tone (for auxiliary receivers)

4

GENERAL INFORMATION Midian Electronics’ VTE-1, voting tone encoder (also known as a pilot tone generator or status tone generator) with a 600-ohm line driver, pairs with a radio receiver to create an analog satellite voting receiver or auxiliary receiver. Satellite voting receivers are spread out over a geographic area to provide greater radio coverage and are connected via a dedicated line, telemetry link or microwave to a voting comparator. The voting comparator looks at the signal to noise ratio from multiple voting receivers and passes the best quality signal to the dispatcher/repeater. The VTE-1 looks at the COR coming from the receiver. When COR is inactive the VTE-1 generates a voting tone to the voting comparator. This tone is selectable as 1950 Hz, 2175 Hz, 1600 Hz or 2700 Hz. Custom tones can also be ordered from Midian. When the receiver’s COR is active the tone is no longer generated and the audio from the radio is sent to the voting comparator. Midian’s VTE-1 is compatible with the following types of voting systems:

Motorola Spectra-TAC

JPS Communications (Raytheon) SNV-12

GE Mastr II

RF Technologies Eclipse

Other systems using 1950 Hz, 2175 Hz, 1600 Hz or 2700 Hz as the voting tone.

5

HARDWARE INSTALLATION

Be certain to follow standard anti-static procedures when handling any of Midian’s products. Getting Started: The VTE-1 has a number of adjustment potentiometers and configuration jumpers. These have been adjusted and configured at the factory for a typical installation. However, audio levels should be verified and adjusted (if necessary) at the time of installation. Also, the configuration jumpers should be inspected prior to installation to verify that they are in the right configuration. Jumper descriptions appear in the jumper settings section with a quick reference table. Line Interface The line interface connector CON7 is a 10-pin RJ-45 style connector on the left side of the back panel.

2-Wire Operation: For a 2-wire installation, simply connect pins 5 and 6 (red and green) to the dedicated line. A standard 4 conductor phone cable will function properly in connector CON7. See table 3.1. Table 3.1

Pin Color 2-Wire CON7-4 Black Not Used CON7-5 Red Line 1 CON7-6 Green Line 1 CON7-7 Yellow Not Used

Radio Interface: CON6 is located in the middle of the back panel and is used to connect the VTE-1 to the satellite or auxiliary receiver. The following are the connection points: CON6: CON6-2 (Orange): COR: Connect this lead to the busy detect of the radio. This input is used to control whether audio should be passed down the line to the voting comparator or generate the pilot tone. CON6-6 (Red): Battery (13-18 VDC): Connect this lead to 13-18 VDC from the base station/repeater. CON6-7 (Black): Ground: Connect this lead to the base station’s or repeater’s ground. CON6-8 (White): RX Input: Connect to the receive audio in the satellite or auxiliary receiver after the sub-audible hi-pass filter and at some point that gives flat audio to the VTE-1. Speaker audio is fine if it is single ended, but make certain the volume control cannot be turned down accidentally.

Diagram 3.1

1

6

HARDWARE ALIGNMENT The alignments are preset at the factory and should not need to be adjusted during installation. However, if an adjustment is needed please follow the procedures below. RX Input Line Level Adjustment: 1. With voice being received from the base station adjust RP3 while monitoring TP1 with an oscilloscope, so that TP1

shows around 700 mV p-p. Also verify that JP22 Pin 2 shows around 180 mV p-p. RX Output Line Level Adjustment: 1. With voice being received from the base station adjust RP6 while monitoring the line out with a line level meter and

set for approximately -10 dB on average voice or -5 dB on peak voice. Pilot Tone Level Adjustment: 1. Prior to performing this step, the line level adjustments above must be done. Set RP2 to the desired dB level (-20 to

+10 dB). Setting the COR Input of the VTE-1 to the inactive state (logic high) will cause the unit to generate the Pilot Tone.

Note: If a line level meter is not available for the level adjustment use an AC voltmeter with a DB scale. A voltmeter would not be set up for balanced 600 ohm audio, but it will provide a close measurement.

7

JUMPER SETTINGS The following table shows the default jumper settings and their function:

Jumper Number

Default Position Description

JP21 1-2 In – 2-3 Out De-Emphasis jumper JP36 1-2 In Termination jumper JP40 1-2 In Termination jumper JP41 1-2 Out 2175 Hz Pilot Tone Select JP42 1-2 In 1950 Hz Pilot Tone Select JP43 1-2 Out 2700 Hz Pilot Tone Select JP44 1-2 Out 1600 Hz Pilot Tone Select JP41-JP44 All Out No Pilot Tone

8

CONTROLS & INDICATORS Power LED: This red LED indicates that power is applied to the unit through the rear connector. COR/MON LED: This red LED indicates carrier is detected from the receiver. Tone LED: This red LED indicates the Pilot Tone is being generated.

OPERATION Voting Tone Encode: When COR is inactive from the receiver to the VTE-1, the unit will generate the selected Pilot Tone to the voting comparator. Receive: When COR is active from the receiver to the VTE-1, the unit will pass the voice from the receiver to the voting comparator.

9

THEORY OF OPERATION RX Voice Path: RX audio from the base station goes through hipass filter C39 and RP3. RP3 also serves as the RX input level adjustment pot. This audio is then fed into audio amplifier U8:2 which acts as low pass filter for noise above 3 KHz and if jumper JP21 is installed it can provide a 6 dB per octave de-emphasis if desired. Audio from U8:2 is fed to C56. Voice audio is input into the audio mixer U8:4. The mixer audio is then input into the line amplifier (U20:3) which drives T1. The line amplifier has an enable transistor that is controlled by the microprocessor. The micro can respond to the COR carrier input and enable this amplifier. Pilot Tone is injected into the audio path at C-59 PWM input. Power Supply: 13-18 VDC is input on the red wire of the Radio Interface connector and then into RF inductor L7 into an auto-resettable polyswitch. D22 is a polarity protection diode that is designed to pop the resettable fuse if power is hooked up backwards. C31 and C34 act as RF bypass caps after the RF inductor L7. U6 acts as a 12 VDC regulator. Its output is fed to all of the analog circuitry and U14:2 acts a pseudo-ground reference at approximately 6 VDC. The 12 VDC on the analog page schematic is also fed over to U4 which is a 5 VDC regulator shown on the digital page to run the microprocessor and the optional encoders/decodes and serial chips. The relays on the digital page receive their 12 VDC from the 12 VDC regulator. They are driven by open-collector transistors to protect the microprocessor from the 12 VDC.

10

TECHNICAL NOTES

No technical notes are available at this time.

MIDIAN CONTACT INFORMATION

Midian Electronics Inc. 2302 East 22nd Street Tucson, Arizona 85713 USA Orders: 1-800-MIDIANS Phone: 520-884-7981 Fax: 520-884-0422 E-mail: sales@midians.com Web: www.midians.com

1

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SEE DOCUMENT 7053-INTFCABLEFOR WIRE COLOR DESIGNATIONS

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SEE DOCUMENT 7503-PROGCABLEFOR BOARD REV INFORMATION

J2

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TX_MOD_INPUT

VOX

ANTIVOX

DUPLEX_PARALLEL_CROSSOVER

GUARD_HOLD_TONE

FUNCTION_TONE

RX_LINE_ENABLE_DISABLE

TELCO_RECV_MUTE

TX_OUTPUT_ENABLE_DISABLE

TX_IN_ENABLE_DISABLE

PWM_VOICE

DTMF_DECODER_2

RING

SCR_MODE_IN

RX_INPUT

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SCR_PTT_IN

TELCO_FEEDBACK_DISABLE

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INTERFACE

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OPTIONAL

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DECODER

F1/F2

LOCATED ON

ANALOG PAGE+

-

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-

+

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PTT

SEE DOCUMENT 7503-INTFCABLE

FOR WIRE COLOR DESIGNATIONS

OPTIONAL

SERIAL INTERFACE

F1

PTT

F2

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COR

SPARE

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TXD

RX IN

TX OUT

RELAYS

TTC-1 ONLY

470KR1

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ihs7503f1_vte1

CJS

2005-01-17 GPC

2010-10-18

F1

1 of 2 7503

MIDIA� ELECTRO�ICS, I�C.

DATE:

DESIG�:

DW� BY:

REV:

APPRSCHEMATIC

COPYRIGHT © 2009

REV

SHEET PROJECT �UMBER

DOCUME�T �AME

VTE-1

100KR316F14 LED

D31

F13 LED

D30

100KR315

F11 LED

D28

F12 LED

D29

100KR313

100KR314

2 1

A6

D32:1

3 1

A6

D32:2

F3 LED

D14

F4 LED

D15

F5 LED

D16

F6 LED

D17

F7 LED

D18

F8 LED

D19

F9 LED

D20

F10 LED

D21

HOOK LED

D4

TRANSMIT LED

D6

RING LED

D7

SYNC/TONE LED

D10

MONITOR/CARRIER LED

D9

F1 LED

D11

F2 LED

D13

DTMF LEDD1

A4D2:1

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6

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8

9

10

11

12

1

2

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GND POWER

GND POWER

ALL JUMPERSNOT INSTALLED UNLESS SPECIFIED

ALL OUT = NO TONEJP41 = 2175HzJP42 = 1950HzJP43 = 2700HzJP44 = 1600Hz

* = NOT INSTALLED

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F2

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BSSQ17

-

+

13

1214

U18:4

LM660

29

.001uC111

47KR137

P S

1 6

5

3 4

2

OPTION JT2

1KR251

1uC48

.22uC159

*

TZ1

1N4001D22

0RR241

150RR141

10KR220

1MR129

330RR289

7

8.2KR160

1KR265

.001u2KV

C170

.47uC150

*C102

10K1%R169

10KRP12

10KR197

22KR127

1MRP16

560pC37

33KR176

P0300

TZ2

.1uC36

10KR74

330RR211

10K1%R239

-

+

6

57

U8:2

LM324

TP2

33KR193

.001uC110

300 mA Resettable Fuse

F1

47KR130

Y25Q28

22KR152

30

BSSQ30

TP15

470KR140

560pC94

INDUCTOR

L3

10KR82

RJ45-10

1

2

3

4

5

6

7

8

9

10

CON7

MIC2940A

VIN1

GN

D2

VOUT 3

U6

100KR283

430KR123

21

3S1

SJ14

3.3KR84

P3100OPTION C

TZ6

3.9KR138

390KR182

.1uC49

22

CH1847OPTION C

TIP 1

RING 2

XMIT(-)7

RCV6

VC

C8

GN

D10

RI5

OFFHK4

XM

IT(+

)9

U13

1uC52

100KR277

.1uC161

33KR249

100KR155

22KR154

43KR132

100KRP8

47KR194

47KR119

.22uC89

1MR146

TP10

JP35

-

+

9

108

U18:3

LM660

5KRP7

.001uC72

-

+

13

1214

U10:4

LM324

1000p NPOC79

47u

+C115

.1uC129

23

P0300OPTION J

TZ10

0RR307

100KR87

1KR232

10KR262

.001u2KV

C166

0RR244

-

+

13

1214

U12:4

LM324

30KR240

TP1

330RR106

-

+

13

1214

U15:4

LM660

B25Q23

.47uC153

1uC53

.47uC108

9

300mA Resettable FuseOPTION J

F7

.1uC109

.1uC163

62KR274

-

+

9

108

U12:3

LM324

30KR175

1MR190

1MR118

0RR209

560KR185

10K1%R253

1KR256

VAN_A

+12V

VAN_A

VAN_A

+5V

+5V

+5V

+5V

+12V

+12V

VAN_A

VAN_A

+12V

+12V

VAN_A

+5V

+5V

VAN_A

VAN_A

VAN_A

+12V

+12V

VAN_A

+12V

VAN_A

VAN_A

+12V

+12V

VAN_A

VAN_A

+12V

VAN_A

VAN_A

VAN_AVAN_A

VAN_A

+12V

VAN_A

+5V

VAN_A

+12V

+12V

+5V

VAN_A

+VIN

+VIN

RX_LINE_ENABLE_DISABLE

ANTIVOX

VOX

PWM_VOICE

DUPLEX_PARALLEL_CROSSOVER

RX_INPUT

FUNCTION_TONE

GUARD_HOLD_TONE

DTMF_DECODER_1

TELCO_RECV_MUTE

TX_OUTPUT_ENABLE_DISABLE

PWM_VOICE

DTMF_DECODER_2

TX_IN_ENABLE_DISABLE

+13_TO_18_VDC

RING

HOOK

SCR_TX_IN

SCR_TX_OUT

SCR_TX_IN

SCR_TX_OUT

SCR_RX_IN

SCR_RX_OUT

SCR_RX_OUT

SCR_RX_IN

SCR_MODE_IN

SCR_PTT_IN

TELCO_FEEDBACK_DISABLE

SCR_OFF_HOOK

TX_MOD_INPUT

SCR_COR

SCR_MODE_OUT

HLG_DET

GUARD_FUNCTION

GUARD_FUNCTION

TELEMETRY_PTT

OPTIONAL 4 WIRE TX ONLY

6 VOLTSANALOG REFERENCE

RX LINE AMPRXLINELEVEL

AUDIO MIXERCOMPANDOR

RX INPUTLEVEL

TX AMP3 KC LOWPASS

300 Hz HIGHPASS

TX OUTPUTLEVEL

GUARD/HOLD TONE NOTCH/

GUARD/HOLD TONE DETECTION

FUNCTION TONE DETECTION

BANDPASS FILTER

MOBILE PRIORITY

TELCO PTT

GUARD/HOLD TONE BANDPASS FILTER

TTC-1 POTS OPTION

BASE

STATION

BASE

STATION

COMPANDOR

GUARD/HOLD TONE

NOTCH NULL

DUPLEXCROSSOVERLEVEL

SEE MCU PAGE

SEE MCU PAGE

RX NOTCH BANDPASS TUNING2000 TO 3100 HZ.

TX NOTCH BANDPASS TUNING

(0805) (0805)

(MULTITURN)

(1206)

(0805)

2000 TO 3100 HZ.

(0805) (0805)

(0805)

(1206)

(MULTITURN)

2 WIRE RX/TX

4 WIRE RX ONLY

2000 TO 3100 HZ.

approx. 700mvp-p

180mvpp@1Kc400mvpp

approx. 8.8Vpp@1Kc

Transmitting to Remotes at -10 db

TP4 should be approx 540mvp-p.

Approx. 1.2Vpp@-20dbmLow Lvl Guard - RP13 at center

MICROWAVE (M LEAD)

TELEMETRY RADIO RECV AUDIO

TELEMETRY RADIO MODULATION

TTC-1 TELEMETRY RADIO OPTION

TELEMETRY RADIO OPTIONAL

approx.

@1Kc

220mvpp@-20dbmLow Lvl Guard

Approx 1Vpp@-20dbmLowLvl Guard

TP6 Approx 600mvpp@-20dbmLow Lvl Guard

Approx 750mvpp@-20dbm@1Kc

Approx 3.7Vpp@-10dbm@1KcRP8 at center

TP6 Approx 5.8Vpp@+10dbmHigh Lvl Guard

TP21 Approx 1VMiddleHigh Lvl Guard

+5V

.1uC119

0RR272

.1uC118

330KR203

3.3KR200

1KR199

100KR201

33KR202

.1uC117

1uC116

.001uC34

560pC31

.47uC151

.47uC152

TTC-1 ONLY

RXLINELEVEL

75KR268

100KR205

750KR204

15KR207

15KR208

.47uC122

.1uC123

68pC120

.001uC180

.01uC178

820pC63

47pC172

ihs7503f1_vte1

CJS

2005-01-17 GPC

2010-10-18

F1

2 of 2 7503

MIDIA� ELECTRO�ICS, I�C.

DATE:

DESIG�:

DW� BY:

REV:

APPRSCHEMATIC

COPYRIGHT © 2009

REV

SHEET PROJECT �UMBER

DOCUME�T �AME

VTE-1

47KR308

.22uC181

1KR309

21A7

D24:1

31A7

D24:2

31A7

D23:2

21A7

D23:1

SD1D34

*

D33

11

22

33

JP27

11

22

33

JP26

((((

1122

33

JP22

JUMPER

11 22 33

HI-Z JUMP 1&2LO-Z JUMP 2&3

LO-Z HI-Z

JP25

11

22

JP36

11

22

))))JP40

11

22JP37

11

22

JP38

1KR310

1KR311

NetC171_1

Ne tR81_1

NetR14 5_2

0RR312

470pC183

* = NOT INSTALLED

WIRE

)) ))112233

JP45

1uC182

10KR353

100KR355

BSSQ40SECONDARY_RX_LINE_EN_DE

0RR350

TP23

TP16

VOICE_STORE10KR354

.47uC184

PWM_2175

0RR351

4.7uC35

4.7uC38

4.7uC44

10uC112

10uC54

10uC69

10uC173

2RR352

2.2uC56

JUMPER NORX AMP

3 KC LOPASS SHORT SJ15OR DE-EMPHASIS OPEN SJ15

SJ15

2.2uC87

1uC200

.001uC202

560pC203

INDUCTOR

L8

0RR358

0RR357

10KR94

.47uC58

PWM_VOICE_1

1000p NPOC81

SB1D25