Assembly Instructions

835A 4 kW, 5 kW or 6 kW UHF Transmitter Meters, Switches, Indicators and Samples
Name
Function
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UHF Exciter Tray - Continued
Fault Indicators
Video Loss (DS9 Red) Indicates that the Input Video has been lost to the Transmitter. The Fault is
generated on the ALC Board located in the UHF Exciter Tray.
VSWR Cutback (DS7 Amber) Indicates that Reflected Power Level of the Transmitter has increased above 20%
which will automatically cutback the Output Power Level to 20 %. The Fault is
generated on the Transmitter Control Board located in the UHF Exciter Tray.
Samples
f(IF) A Sample of the Visual IF taken from the Sample Jack on the IF Carrier Oven
Oscillator Board.
f(IC) A Sample of the 4.5 MHz Intercarrier taken from the Aural IF Synthesizer Board.
f(s) A Sample of the Channel Oscillator Output taken from the Sample Jack of the
Channel Oscillator Assembly.
Exciter O/P An Output Power Sample of the Exciter taken from the UHF Upconverter Board.
Transmitter O/P A Forward Power Sample of the Transmitter taken from the Visual/Aural
Metering Board.
UHF Amplifier Trays
Meters
Meter (A9) Reads power in terms of a percent of the calibrated power output value. A full
scale reading is 100% which is equivalent to the full rated Peak of Sync Visual
Output Power + Aural (600 Watts). Also reads Power Supply and AGC Voltage.
Switch (S2), Meter Selects the desired % Power or the Voltage reading.
% Output Pwr Reads the % Output Power of the Tray. (100% = 600 Watts pk of Sync + Aural)
% Refl (Reflected) Reads the % Reflected Output Power of the Tray. (<5% with all Amplifier Trays
operating)
Power Supply Reads the Power Supply Voltage. (+26.5 VDC)
AGC Voltage Reads the AGC Voltage Level. (1-2 VDC Typical)
Status Indicators
Enable (DS4 Green) Indicates that an Enable, Operate Command, is applied to the Trays from the
UHF Exciter Tray.