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Section 1 - Introduction (UHF Digital TV Transmitters)
E-Compact - Air Cooling - ATSC - High Power
1.4.5 Functional Description of the System
1.4.5.1 ATSC Digital Exciter
The exciter is formed by the MOD GV 40153 module drawer more optional (internal GPS, and
other software optional). This equipment is responsible for generating the digital TV signal and
can perform, among other functions, for controlling the output power and the pre-correction of
distortions caused by filtering and amplification stages of a transmitter.
Has the following main modules:
1. AC-DC Converter (MOD 4779 FTE 1RU +28V/80W);
2. Ethernet/USB-Host/Device interface board (MOD CIM 3744 DIGI and USB);
3. Keyboard (MOD CIM 3717 TECLADO 1U);
4. Display (MOD CIM 30165 LCD 2x40);
5. MOD VENP 40X40 24V 1U;
6. DC-DC Converter (MOD CIM 30143 PWR 8001 V4);
7. Output Amplifier (MOD 4803 PA 100mW 4001);
8. MOD 4854 EXC DIGI 8001 V4 (MOD 4854);
9. CIM 3832 GPS 8001 (Optional);
10.
MOD VENP RADIAL 24V 1U.
The Digital Exciter is responsible for providing an RF signal to excite the amplification stage of
the equipment.
The exciter input is a BNC connector that may receive either an ASI or SMPTE310M transport
stream. The modulation process follows ATSC A/53E recommendation, and is a complex
modulation process generating identical phase-modulated orthogonal IF carriers, (I) and (Q) at
frequency of 18.833916 MHz.
Manual Rev. 0.0 - April 2016
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Figure 1-3 - Internal View
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