Screen Service SDT 303UM

SDT303UM ANALOG/DIGITAL TV TRANSMITTER

CONTENTS

1 INTRODUCTION ...... 2 2 EQUIPMENT COMPOSITION ...... 2 2.1 SINGLE AND DUAL DRIVER CONFIGURATION ...... 2 3 SCA 202UB ...... 5 4 SDT MAGNUM (See Relevant Manual) ...... 15 4.1 CONTROL UNIT ...... 15 4.2 POWER DISTRIBUTION UNIT ...... 16 4.3 OUTPUT COMBINER & DUMMY LOAD ...... 16 4.4 OUTPUT DIRECTIONAL COUPLER ...... 16 4.5 OUTPUT FILTER ...... 16 5 TECHNICAL SPECIFICATIONS ...... 17 5.1 Analog Modulator ...... 17 5.1.1 Video Parameters ...... 17 5.1.2 Audio Parameters ...... 17 5.1.3 General...... 17 5.2 ISDB-T ...... 18 5.2.1 Input ...... 18 5.2.2 TS/BTS Output ...... 18 5.2.3 Modulation ...... 18 5.2.4 General...... 18

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1 INTRODUCTION

The model SDT303UM is a solid state R.F. digital transmitter designed to operate in the UHF 470 ÷ 860 MHz frequency band (Band IV & V), for amplification of analog or digital TV signals.

If used with an analog TV signal, it provides a nominal output power of 30.000 W peak sync (common amplification of video and audio carriers). If used with a ISDB-T signal, it provides a nominal output power of 9000 W average.

2 EQUIPMENT COMPOSITION

2.1 SINGLE AND DUAL DRIVER CONFIGURATION

The SDT303UM is composed of eight different SCA 202UB solid state amplifier, an input splitter to feed all amplifiers with the signal coming from the exciter, a patented coupler with integrated directional coupler to combine the output signal, an output filter (optional), an output coupler (optional), a control unit and a power distribution unit.

The SDT303UM TV TRANSMITTER is composed by four 40 RU, each of these composed by the following components: The two Transmitter rack:

• SCA 202UB AMPLIFIER • SDT DRIVER • CONTROL UNIT • DUMMY LOAD

The two Liquid Cooling System rack:

• LIQUID COOLIONG SYSTEM RACK

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Figure 1: SDT303UM Block Diagram

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Figure 2: SDT303UM Front View

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3 SCA 202UB

+ +

MONITOR TCP/IP LOCAL ON ON ESC REMOTE RF STATUS

EXT. ENABLE WARNING ST-BY OK DRIVER ALARM

Screen Service + Figure 3: SCA 202UB Front Panel

The SCA 202UB model is a solid state amplifier designed for use in the UHF 470 ÷ 860 MHz frequency band (Band IV & V), for amplification of analog or digital TV signals.

If used with an analog TV signal, it provides a nominal output power of 3000 W peak sync (common amplification of video and audio carriers). If used with a ISDB-T signal, it provides a nominal output power of 500 W average when used with a ISDB-T signal. The unit is designed to operate as a final stage feeding up a radiating system. The SCA 202UB model is highly over-dimensioned: each of the eight pallets used in the final amplifier section is designed to grant an output power of up to 400 W peak. This ensures high linearity and reliability, and a low level of sidebands.

The SCA 202UB is mainly composed of the following parts: -8 solid state amplifier modules (400W, class AB), used for the final stage. -2 solid state amplifier modules (70W, class A), used as drivers. -1 RF splitter 2 way and RF combiner 4 way -2 RF splitter 4 way -2 dual RF combiner 2 way -1 directional coupler -1 protection and measuring board -4 Power Supply Units

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Figure 4: SCA 202UB Modules View

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Figure 5: SCA 202UB Modules View

The SCA 202UB solid state amplifier block diagram is shown in Figure 4.

The equipment is a class AB amplifier designed to be used as stand alone final stage. It is completely wide band, so normally no tuning operation is required over the entire band.

The R.F. input stage consists of two class A amplifier modules connected to the R.F. input through the first splitter.

The signal is amplified and then divided in eight ways by means of two 4 ways couplers.

Each way feeds a 400 W class AB amplifier module. The output signal at the eight modules is recombined first with 2 way couplers and then with a 4 way coupler.The output passes through a directional coupler.

The directional coupler detects samples of direct and reflected power at the output of the amplifier, and feeds the PWR and REF inputs of the protection and measuring board.

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The protection and measuring board controls the output peak power, the reflected peak power, the heat-sink temperature, voltages and current of each power supply output. In alarm condition it disables the power supplies. When the alarm condition extinguishes the board enables the power supplies again.

By means of a multifunctional two rows LCD display on the front panel, it is possible to monitor all the equipment parameters such as: output power, reflected power, power supply boards voltages, R.F. modules currents, heat-sink temperature, all protections thresholds and some alarms related information.

Each fan is temperature controlled by means of a temperature sensor (separate from the measuring board).

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Sc re e n Se r v i c e I t a l i a Title 131S00 UHF 4 ways R.F. splitters (layout) Si zeDoc um ent num ber Re v. A4 131S00 - M A Date: 05-05-2000 Sh e e t 1 o f 1 Drawn by: AzB

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Operating frequency range UHF Band IV & V: 470 - 860 MHz

TV Standards ISDB-T,DVB-T/H, PAL, ATSC, NTSC

Operating temperature From -10°C to +45°C

Storage temperature From -30°C to +85°C

Maximum relative humidity 90%, non condensing

Main supply 3 phase 220 / 400 V A.C. ± 15%

Power consumption 4000 VA

Protections Overpower SWR 4 x Overvoltage 8 x Overcurrent Overtemperature

Dimensions (max.) 483 mm (W) X 688 mm (D) X 222 mm (H)

Weight 49 kg

Input impedance 50 Ω

Input connector N female

Input VSWR 1.7:1 typical 2:1 max.

R. F. Input (AVERAGE ISDB-T) 1W

R. F. Input (ANALOG TV) 2.5 W peak sync

Output impedance 50 Ω

Gain > 30 dB

Load mismatch 2:1 Max.

In Band Flatness Better than ± 0.1 dB

Output connector 7/16" EIA (others on request)

RF monitor connector BNC female

Nominal Output power : 500 W rms (ISDB-T sidebands 36dB at F0 ± 4.3MHz)

Sidebands at F0 ± 4.3MHz Better than -36 dB at rated output power (With no pre-correction inserted)

Spurious emission Better than -60 dBc with output filter

Nominal Output power 3000 W peak sync

I. M. D. (-8, -10, -16 dB) Better than -58 dBc at rated output power With SCT, SCR or SCC Series drivers With pre-correction inserted

Spurious emission Better than -58 dBc with output filter

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4 SDT MAGNUM (See Relevant Manual)

INP UT SAT RECE IVER

+ + OK R G B As i i n 1 Asi in 2 Screen Service Lock ALARM

+ + ON ST-BY LNB IN GBE ESC

Figure 11: Magnum Front Panel Software Defined Transmitter able to implement any ISDB-T, DVB-H, PAL, ATSC e NTSC on board loaded television standard. It receives a signal coming from satellite, RGB/CVBS, digital fluxes or TCP-IP. The selected signal, after digital elaboration, is presented, at IF 997MHz fixed frequency and ISDB-T, DVB- T/H, ATSC, PAL e NTSC selected standard, to the UP CONVERTER input. The UP CONVERTER generates the selected output UHF frequency without any filter tuning. The output power lever is reached by three PARALLEL, NO SINGLE POINT FAILURE, and LDMOS AMPLIFIERS RF stages. The MAGNUM is also equipped with a GPS RECEIVER to generate the required high stability reference. The equipment has also the capablidity to be remotely managed via GbE interface.

4.1 CONTROL UNIT

MONITOR TCP/IP LOCAL ON ON ESC REMOTE RF STATUS

EXT. ENABLE WARNING ST-BY

DRIVER ALARM OK

Screen Service

Figure 12: CONTROL UNIT Front Panel

The SDT 303UM is provided by a control unit which is composed by a microprocessor controlled protection and measuring board which receives metering signals from the directional coupler mounted on the output combiner, controls the enabling of the RF amplifiers and collects the serial bus so to be able to pass all the working parameters and information to an external remote control unit.

The directional coupler integrated into the RF output combiner detects samples of direct and reflected power. By means of an NTC, it also measures the air temperature in the rack cabinet. The FWD, REF and TEMP measurements are sent to the control unit.

A third line couples the RF output signal and feeds the monitor output connector located on the front panel.

The protection and measuring board controls the output peak power, the reflected peak power and the temperature. In alarm condition it disables the amplifiers and the driver. When the alarm condition extinguishes the board enables the amplifiers and the driver again.

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By means of a multifunctional two rows LCD display on the front panel, it is possible to monitor the equipment parameters such as: output power, reflected power, air temperature, all protections thresholds and some alarms related information.

4.2 POWER DISTRIBUTION UNIT

MAINS A.C. MAINS PROTECTION UNBALANCED PHASES LOW MAINS VOLTAGE SPARKOVER THERMAL PROTECTION BLOWER L3 ON L2 ON L1 ON WARNING! To assure countinuous line protection VOLTAGE WARNING replace cartridges when "SPARKOVER" led lits

Figure 13: POWER DISTRIBUTION Front Panel

The power distribution unit receives the mains power from the electrical network (3 phase) and distributes it to the different units.

It also controls and protects the air extraction blower located in the rack.

4.3 OUTPUT COMBINER & DUMMY LOAD The output combiner receives the eight input signals from the eight power amplifier outputs and sum them up to give the rated ouput power. The summ approach minimizes the combining power losses and grant a very wide band solution . However in case of any foulty inside the power amplifier, the dummy load , located in the cabinet , make possible the continuous transmission also in the worst case condition.

4.4 OUTPUT DIRECTIONAL COUPLER The output directional coupler is a directional two way coupler detector monitoring the forward and reverse output power and an rf coupler monitoring the forward output power. These three signals interface the control unit.

4.5 OUTPUT FILTER

The output from the combiner goes through a bandpass filter (optional, analog or digital). This filter removes unwanted intermodulation products and harmonics and ensures the spectral compliance of the amplifier output.

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5 TECHNICAL SPECIFICATIONS

5.1 Analog Modulator

5.1.1 Video Parameters

Number of inputs 3 x RGB, 3 x Composit Video, 1 x SDI (Audio Embedded) Input Impedance 75 Ω Input Level 1 V p.p. ±3dB White/Sync level limiter 95% 2T K Factor <1,5% Amplitude/Frequency response ±0,5dB (throughout the vision band) Differential gain <3% Differential phase <3% Tilt (50Hz) <2% Tilt (15Hz) <2% Group Delay ±35ns (throughout the vision band) Sync pulse compression <3° S/N ratio (weighted) >=60dB ICPM <3° Luminance non linearity <4% Field time bar tilt <2% Line time bar tilt <2%

5.1.2 Audio Parameters

Number of inputs 2 x Mini XLR (Stereo, dual sound, mono) Input level 0dBm ±6dB Carrier Level -13, -20 dB (adjustable) Modulation capability ±120kHz Frequency response (30Hz to 15kHz) ± 0,4dB T.H.D. (30Hz to 15kHz) <0,4% Pre-emphasis 50µs or 75µs or flat S/N ratio (un-weighted) >60dB Stereo/Dual sound (IRT) Included Stereo Separation Better Than -55DB (typ.)

5.1.3 General

Video system B, D, G, H, I, K, M, N Color standards NTSC, PAL Output connector N female Output impedance 50Ω Frequency precision 1ppm or internal GPS locked External Reference Frequency Input 1 PPS or 10MHz Offset steps (optional) 1Hz I.M.D. at rated output power Better than -60dBc Harmonics (with output filter) -60dB or better Spurious emissions (with output filter) -60dB or better

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5.2 ISDB-T

9 Hierarchical modulator, 13 segments; 9 Modes 1 (2k), 2 (4k) e 3 (8k); 9 Convolutional code rate ½, 2/3, ¾, 5/6, 7/8; 9 Configurable time interleaving; 9 Guard Interval ¼, 1/8, 1/16, 1/32

5.2.1 Input

Signal type DVB ASI-C (EN 50083-9) 188 ou 204 bytes Level 200mVpp to 880mVpp TS/BTS data rate 20Mbps Impedance 75Ω Conector BNC

5.2.2 TS/BTS Output

Signal type DVB ASI-C (EN50083-9) 188 or 204 bytes Level 200mVpp to 880mVpp TS/BTS rate 20Mbps Impedance 75Ω Conector BNC

5.2.3 Modulation

Type 64QAM MER >40dB IM Distortion <60dB OFFSET precision 1Hz steps Frequency stability 1ppm or GPS lock Reference frequency input 10MHz, BNC 50Ω

5.2.4 General

Nominal Output Power 30.000W p.s. / 9.000W rms Local control and monitoring Extencive front panel control Remote control and monitoring Local terminal on RS232 Web based java interface Telnet access via Ethernet SNMP Operating temperature -10°C to +45°C Maximum relative humidity 90% non condensing Maximum operating altitude 2500m a.s.l. (>2500m on request) Main supply 220V AC

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