MEX IIANALOG / DIGITAL

MultimodeTV Exciter

1|1.75”HE

MODULATOR

— Fully numerical signal elaboration and modulation— Adaptive pre-distorter and pre-equalizer— Multi-Standard equipment— Dual Cast transmitter— Band I – Band III – Band IV/V— Frequency agile in the band

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The core of MEX II is represented by a new modulator card that implements all the modulation, control and supervision functions.

HIGHQUALITYRF SIGNALAll operations necessary for the generation of

a high quality RF signal, in accordance with all analog and digital television standards are completely performed by a Real Time Digital Signal Processing using a FPGA (Field Programmable Gate Array).By loading two different firmware in the memory card, the modulator can operate as Dual Cast, with the possibility to switch from analog to digital transmission with a simple command (local or remote).

In addition to the standard ATV and DTV inputs,when the exciter operates in one of the DTV modes, a Giga Bit Ethernet (GbE) port, able to receive up to four MPEG-2 Transport Streams, can be integrated.

The exciter can be equipped with a RF receiver with two available inputs to implement the adaptive pre-correction and the transmitter output power measurement (power meter). The receiver can be provided with a DVB-S/S2 tuner, to extract a MPEG-2 transport stream from a satellite link, or with a DTV receiver, to implement a regenerative transposer.

The modulator card includes also an input for the measurement of the reflected power.

The baseband digital I/Q signal generated by the FPGA is directly converted to RF (bands I, II, III, IV and V) by means of a RF DAC.In DTV mode, a pre-equalization function (to compensate for linear distortions of the output filter) and a predistortion function (to compensate for non linear distortions of the high power amplifier) are available, both using fully automatic adaptive algorithms.

MEX IIMULTIMODE TV EXCITER

The exciter is equipped with an internal 10 MHzreference that can be locked to an external one.

In case of external reference loss, the system keeps on generating the internal reference maintaining the accuracy of the external one without discontinuity. A software routine estimates the frequency and time drift allowing the RF muting when these drifts overcome a settable threshold. When the external reference returns, a software procedure assures a soft re-lock without discontinuity.An internal GPS receiver is available to provide a high accuracy frequency reference and to allow MEX II operation in a Single Frequency Network (SFN).

EXCITER

10 MHz

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Frequency Reference Characteristics

RF frequency offset ±10 KHz DTV, ± 50 KHz Analog, 1 Hz step

Frequency reference input 1 BNC, 50 Ω, 10 MHz, 7 dBm± 6 dB

Frequency reference output 1 BNC, 50 Ω, 10 MHz, 7 dBm

1 PPS input 1 BNC, 50 Ω, TTL

1 PPS output 1 BNC, 50 Ω, TTL

GPS input 1 N, 50 Ω, up to 250 m RG58 cable

OCXO frequency aging ±1x10-7/year, ± 3x10-7/10 years

GPS frequency accuracy ±1x10-12 average 24h of sync

GPS frequency aging ± 5x10-10/24h free running

GPS frequency short term stability <3x10-11, 10 s Allen variance

The amplifier employs only latest generation transistors and provides an output signal with power up to 5 Wrms DTV or 20 Wps ATV, adequate for subsequent high power amplification.

The RF output signal, generated by the digital modulator, is sent to the MEX II RF amplifier section.

RF Characteristics

RF output (exciter) 1 N, 50 Ω, 5 Wrms DTV, 10 W ps Analog

Forward RF input (power meter) 1 N, 50 Ω, 0 dBm +3, -7 dB

Reflected RF input (power meter) 1 BNC, 50 Ω, 0 dBm +3, -7 dB

RF monitor 1 BNC, 50 Ω, 0 dBm

19.000 INSTALLATIONS700 DIFFERENT CONFIGURATION200 DVB-T2 TX installed (July 2015)1.000 high and medium power TV transmitters still in service since 1985.130 Operating Countries

Why ITELCO?ITELCO Numbers

MEX IIMULTIMODE TV EXCITER

INNOVATION → Always Pioneers in the broadcasting industrySTRENGHT → 1.000 high and medium power TV transmitters still on-air since 1985EASY MAINTENANCE & POWER EFFICIENCY → Save money and pay back your transmitterRESEARCH & DEVELOPMENT → 10% of our revenue reinvested into R&D

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THE NEW MULTIMODE EXCITER, MEX II COLLECTS ALLITELCO-ELECTROSYS EXPERIENCE IN DIGITAL SIGNAL PROCESSING.

MEX II IS AN INNOVATIVE AND COMPACT EXCITEROBTAINED BY OPTIMIZATION AND SIMPLIFICATION OF THE RELIABLE MEX EXCITER INTO ANEW GENERATION PLATFORM.

The control and supervision of the exciter are guaranteed locally with graphical display and keyboard,remotely through Simple Network Management Protocol (SNMP v1/v2c/v3) and Web Server on Ethernet interface. All parameters available on the display can be accessed remotely.

On the exciter front panel, a USB connection is also available. It can accommodate a pen-drive to save the history log or load/save settings (HOST), or can be used for a connection to a PC to carry out monitoring, supervision or maintenance (DEVICE). The remote control and supervision are possible by using two methods: by means of Web browser displaying HTML pages (independent from platform), or by downloading and installing on PC (MS Windows OS) Electrosys proprietary software. A control through the USB port is possible with proprietary software.HTML pages can use SSL encryption techniques on HTTPS connections.

SMTP (Simple Mail Transfer Protocol) is used for events notification (such as SNMP TRAP) to five different destination addresses.

The NTP protocol provides synchronization of the internal RTC (Real Time Clock) with one or more NTP servers.

The administration operations and the management of the relevant parameters are performed using Telnet andFTP (File Transfer Protocol) protocols.

The MEXII remote management is regulated by three privileges of access that determine the action possibilities based on the user level:• Administrator: full control;• Configurator: operative settings;• End User: check of the exciter and some

simple settings.

MEX IIMULTIMODE TV EXCITER

MEX IIMULTIMODE TV EXCITER

REMOTECONTROLMANAGEMENT

MEXII firmware is upgradable via USB or via Ethernet (also remotely via FTP).MEXII is capable of interfacing with new generation ITELCO-Electrosys equipment (Central Control Unit, HPAs, etc.) via 2 CAN Bus that ensure high reliable and strong data exchange.In order to maintain compatibility with previous generation equipment, the Exciter is also provided with RS-232 and RS-485 connections. Optionally, it can be equipped with dry contact parallel interface.

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Remote Interfaces

RS-232 ITELCO proprietary control protocol

RS-485 ITELCO transmitter control system

Ethernet SNMP, HTTP, HTTPS, SSL, SNMP, SMTPfor supervision and controlFTP / Telnet for administration NTP

CAN Bus for transmitter control system

Parallel for simple control and commands

General Characteristics

Power supply 88 ÷ 240 V, 50 ÷ 60 Hz

Temperature 0 ÷ 45 °C

Relative Humidity 0 ÷ 90 % (non condensing)

Storage temperature -40 ÷ 70°C

Mechanical Specifications

Transmitter Dimensions (wxdxh) 485x520x45

Transmitter Weight 5 kg

The modulator is fully compliant with EN 300 744, TS 101 191 and EN 50083-9 standards including hierarchical modulation and DVB-H.

In case of SFN operations, the card provides the extraction of the MIP (Megaframe Initialization Packet) information, to carry out the automatic delay compensation and optional function

DVB-T/H VERSION

DVB T/H Characteristics

Inputs 4 BNC 75Ω, DVB-ASI, 1 RJ-45 GbE

Input Data format 188/204 bytes packets, continuous and burst mode

Input Bit Rate According to ETS 30 744 in SFNBit rate adaptation and PCR restamping in MFN

IFFT 2K, 4K, 8K

Code rate 1/2, 2/3, 3/4, 5/6, 7/8

Guard interval 1/4, 1/8, 1/16, 1/32

Interleaver Native, in-depth

Constellation QPSK, 16QAM, 64QAM

Hierarchical (alpha) 1, 2, 4

Network operation MFN, SFN

Bandwidth 5, 6, 7, 8 MHz

MER > 40 dB

Shoulders > 50 dB

Carrier suppression (center frequency) > 60 dBc

Average amplitude imbalance <1 %

Average quadrature error <1 °

Spurious level in band <- 70 dBc

elaboration (time offset, frequency offset and power control functions).

In case of MFN operation, bit rate adaptation by inserting or discarding null packets is performed and, in order to avoid PCR jitter, PCR restamping is done.

The modulator continuously checks the input transport stream to find any first priority error (according to TR 101 290); in case of error, it can switch to the other input. If the two input transportstreams are identical, the switching is seamless.

For test purposes, a contiguous block of carriers can be switched off or, on the contrary, can be switched on.

ASI 1/SMPTE 310M 1

DIGITALMODULATOR

RF AMPLIFIER RF OutASI 2/SMPTE 310M 2/NICAM AD DATA

ASI 3/NICAM AD DATA 728 Kb/sASI 4/NICAM CLOCK 728 Kb/s

GIGA BIT ETHERNET

10 MHz In RF REFLECTED In1 PPS In

10 MHz Out1 PPS OutGPS RF In

CAN

DISPLAYand

KEYBOARD

CAN 2ETHERNET

USBRS-232/RS-485

VIDEO 1

ATV + NICAMINTERFACE

RF RECEIVER

RF In 1RF OutRF In 2

RF REFLECTED In RF In 1VIDEO 2 RF In 1

AC/DCLEFT/LEFT NICAM

RIGHT/MPXRIGHT NICAMSUB CARRIER

Simplified Box Diagram

MEX IIMULTIMODE TV EXCITER

MEX IIMULTIMODE TV EXCITER

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ATSC (8VSB DTV)VERSION

DVB-T2VERSION

ATSC Characteristics

Inputs 2 BNC 75 Ω, SMPTE 310M, 1 RJ-45 GbE

System clock locked to the input data or 10 MHz reference

Input Bit Rate 19.392658 Mbit/s (lock to the input data) Bit rate adaptation and PCR restamping (lock to the 10 Mhz)

Modulation 8-VSB

Bandwidth 6 MHz

EVM < 1.5 % rms

Shoulders > 50 dB

Spurious level in band <- 70 dBc

Spurious level out band <- 60 dBc

DVB-T2 Characteristics

Inputs 2 BNC 75Ω, DVB-ASI, 188/204 packets, continuous and burst mode, 1 RJ-45 GbE

Input data format MPEG-2 TS over ASI, T2-MI over ASI or IP

PLP Management 1 ÷ 8

PLP Constellation QPSK, 16QAM, 64QAM, 256QAM

L1 post constellation BPSK, QPSK, 16QAM, 64QAM

Constellation Rotation Normal, Rotate

Channel Bandwidth 5 / 6 / 7 / 8 MHz

Guard Interval 1/128, 1/32, 1/16, 19/256, 1/8, 19/128, 1/4

FFT mode 1k, 2k, 4k, 8k, 16k, 32k (normal or extended)

Code rate 1/2, 3/5, 2/3, 3/4, 4/5, 5/6

FEC Short (16k), Normal (64k)

Pilot pattern From PP1 to PP8

Network type MFN, SFN

MER > 40 dB

Shoulders > 50 dB

Carrier suppression (center freq) > 60 dBc

Average amplitude imbalance < 1%

Average quadrature error < 1°

Spurious level in band < -70 dBc

The modulator is fully compliant with ATSC specifications.

The system clock can be locked to the input data(the input bit rate must be 19.392658 Mbit/s) or to the 10 MHz reference (internal, external or from the integrated GPS receiver); in this case the bit rate adapter (described in the DVB-T/H section) allows the exciter to accept any input bit rate.

The modulator continuously checks the input transport stream to find any first priority error (according to TR 101 290); in case of error, it can switch to the other input.

Optionally, if the two input transport streams are identical, the switching is seamless.

Both pre-distorter and pre-equalizer can be adaptive.

The modulator is compliant with EN 302 755, ETSI TS 102 773 DVB-T2 specifications, and is able to manage multiple PLP (up to 8) and MISO transmission for SFN.

Moreover it supports T2-MI protocol to extract synchronization and configuration from the DVB-T2 Gateway.

A complete set of test modes are available to make the user able to perform tests without inputs.

MEX IIMULTIMODE TV EXCITER

MEX IIMULTIMODE TV EXCITER

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ISDB-TBVERSION

ANALOG TV VERSION

ISDB-Tb Characteristics

Inputs 2 BNC 75Ω, DVB-ASI, 188/204 packets, continuous andburstmode, 1 RJ-45 GbE

Input data format TS, BTS

Mapping DQPSK, QPSK, 16QAM, 64QAM

Carrier spacing 1 KHz, 2 KHz, 4 KHz

FEC 1/2, 2/3, 3/4, 5/6, 7/8

Guard Interval 1/4, 1/8, 1/16, 1/32

Time Interleaver 0 ÷ 16

Hierarchical Up to 3 layers

Network type MFN, SFN

MER > 40 dB

Shoulders > 50 dB

Carrier suppression (center freq) > 60 dBc

Average amplitude imbalance < 1%

Average quadrature error < 1°

Spurious level in band < -70 dBc

VIDEO Characteristics

TV standard B, G, D, H, I, K, K1, M, N

Colour standard PAL, NTSC, SECAM

Number of video input 2 (not simultaneously working), BNC

Input impedance 75 Ω

Return loss > 36 dB (0 – 6 MHz)

Input voltage level 1 Vpp ± 6 dB

Input AGC Manual or on ITS line

Manual gain adjustment step 0.1 dB

Clamping Back porch level

Modulation depth 5 ÷ 15 %

White limiter 85 ÷ 95 % modulation

Sync pulse regeneration 20 ÷ 30 %

Video filtering According to the standard or by-passed

Differential gain variation <0.5 %

Differential phase variation <0.5 °

Static linearity ± 0.1 dB (25 Hz ÷ fmax, depending on the st.)

The modulator is fully compliant with ARIB STB-B31 and TR-B14 specifications and manages normal MPEG-2 TS (MFN) and BTS (Broadcast Transport Stream) input data formats.

TMCC (Transmission and Multiplex Configuration Control) are extracted for modulator configuration.

In MFN mode, Single Layer A is used and Bit RateAdaptation and PCR re-stamping are performed.

No trimming operations are needed due to fully digital video and audio modulation, obtaining an exceptionally performance stability over environmental conditions changes.

The exciter has a stereo/dual sound encoder with automatic mode selection using teletext line, and one wide band (up to 120kHz) input for an external audio encoder.

Optionally, an integrated NICAM modulator,which can also accept an external pre-codifiedNICAM 728 Kbit/s stream and additional data, is available.

Additional RF sound output, for sound separatedamplification transmitters, is available.

MEX IIMULTIMODE TV EXCITER

MEX IIMULTIMODE TV EXCITER

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AUDIO Characteristics

Number of audio input 2, XLR

Input impedance 600 Ω />5 KΩ (balanced and unbalananced)

Nominal input level 0 dBm, –6, + 21 dB

Gain adjustment step 0.1dB

Hard limiter adjustable 1KHz step, 0 ÷ 100 KHz deviation

Channel cross-talk >70 dB (40 Hz ÷ 15 KHz)

Stereo cross-talk >40 dB (40 Hz ÷ 15 KHz)

Harmonic distortion (with preemphasis) < 0.1% (40 Hz ÷ 15 KHz, ± 50 KHz deviation)

FM SNR (unweighted) < - 70 dB (± 50 KHz deviation at 500 Hz)

FM SNR (weighted) < - 65 dB (± 50 KHz deviation at 500 Hz)

AM Noise < - 60 dB

Preemphasis 50/75 μs (± 0.1 dB; can be switched off)

Input frequency response ± 0.1 dB, 40 Hz ÷ 15 KHz± 0.1 dB, 40 Hz ÷ 120 KHz in wide band mode

Pilot signal generation 54.6875 KHz (Locked to the line frequency)

Pilot carrier modulation AM

Pilot modulation depth 50 %

Pilot modulation tone frequency 0 0 (mono), f line/133 (stereo), f line/57 (dual)

Audio encoder mode Mono, stereo, dual sound, wide band, auto

NICAM Characteristics

Number of audio inputs 2, XLR

Input impedance 600 Ω />5 KΩ (balanced and unbalanced)

Nominal input level 0 dBm ± 10 dB

Pre-codified NICAM data input 728 Kbit/s, BNC, high impedance TTL

Additional data input 728 Kbit/s, BNC, high impedance TTL

Clock for external coder or additional data 728 KHz, select. in/out, BNC, high imp. TTL

Frequency reference output 38.9 MHz, BNC, TTL

Carrier Frequency 6.552 MHz (I), 5.85 MHz (B/G)

Harmonics and spurious > 50 dB below NICAM carrier level

Spectrum Shaping ± 0.5 dB from nominal

Amplitude Imbalance < 0.1 dB

Quadrature error < 1 °

THD+N at 2 KHz tone input < 0.1 % at nominal input level

Itelco ElectrosysCertifications:

Quality System UNI EN ISO 9001ITQS - To provide our customer withvery reliable equipment and premium solutions,we follow a total quality management philosophy

ISO 9001:2000 n°9110.ITE1

MEX IIMULTIMODE TV EXCITER

ANALOG TV VERSION

05018 Via Dell’Innovazione 2 Orvieto TR — ITALYPh +39 0763 96 03 00 — Fax +39 0763 34 18 10www.itelco.tv — info@itelco-electrosys.com

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