351804-1 Rev. 100
COM5000-8 TECHNICAL MANUAL
Driver Gain adjustment (1.25kW PA Module gain):
The DRIVER/ALC gain adjustment, using potentiometer R2, is performed to set the 1.25kW PA Module gain
equal to approximately 47 dB at 29.9 MHz.
a) Operate the PA Module as a “stand alone” Amplifier – while still part of the Transmitter - as
described in section 5.4.1 above.
b) Turn ON the System. Select a T-4180 operating frequency of 29.9 MHz.
c) Set the RF Signal Generator output level to +12 dBm.
d) Connect the RF Signal generator to the 1.25kW PA Module.
e) Key the Transmitter and observe the power output. Adjust R2 for a power output of 1000 W.
5.4.1.6 1.25 kW Combiner Maintenance
To gain access to the 4-Way Combiner PCB proceed as follows:
1. Loosen the two "captive" screws that secure the Filter assembly to the 1.25kW PA Module front
panel.
2. Carefully move the filter module up to past its vertical position and make sure that it "leans back"
onto its back stops.
3. For location of the 1.25 kW Combiner PCB see Figure 5.4.1.B.
Adjustments: No adjustments are required.
5.4.1.7 Fan Interface Maintenance
To gain access to the Fan Interface plate, proceed as follows:
1. Loosen the two "captive" screws that secure the Filter assembly to the 1.25kW PA Module front
panel.
2. Carefully move the filter module up to past its vertical position and make sure that it "leans back"
onto its back stops.
3. For location of the Fan Interface plate see Figure 5.4.1B.
Adjustments: No adjustments are required.
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