3.2 AGC Module
Figure 3-20. AGC Module
EXC ADJUST R-51 adjusts exciter sample to proper range.
SET R-21 adjusts AGC overdrive.
LED Indicates AGC on when lit.
MODE SWITCH Switches AGC on/off
VCA Test point 5, a sample of dc voltage to the Voltage Controlled Amplifier
COMP Test point 2, dc voltage output of comparator
TX Test point 8, detected sample of pa output.
EXC Test point 7, detected sample of exciter drive.
GND Ground
Table 3-2. AGC Module Controls and Indicators
VERIFICATION OF AGC OPERA-
TION
1. Reduce transmitter power to 50%.
2, Set AGC MODE switch to OFF.
3. Raisetransmitter powerback to 100%.
4. Set AGC MODE switch to ON.
5. Verify AGC action reduces transmitter
power.
6. If AGC does not reduce transmitter
power, contact maintenance personnel
and have them set AGC per section 5.15.
3-14 888-2365-001 Rev. B: 1/11/1999
WARNING: Disconnect primary power prior to servicing.
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