14: Maintenance
14-26
PRC1099A-MS
C44, C17
Optimizes the 75 MHz filter passband.
1 Set the signal generator to 7.0 MHz and the level at
-50 dBm.
2 Adjust C44 and C17 for maximum output.
3 Alternate adjustments for C44 and C17 between signal
generator settings of 7.0 MHz and 6.999 MHz until levels
are equal.
R37, C65,
C24
Optimizes CW oscillator.
1 Set the radio to 7.0000 MHz.
2 Connect a wattmeter and dummy load to the 50 ohm
output.
3 Using a CW key device, key the radio and adjust C65 and
C24for maximum output.
4 Check all test frequencies and insure output power does
not deviate more than 3W.
Table 14-6 Mixer Board Adjustments (continued)
Designator Adjustment
Figure 14-9 Mixer Board Signal Connections and Adjustment Points
1650 I/O
1650 kHz
In/Out
Receive Output
Level Adjust
(T3)
2nd LO
Level Adjust
(C58)
Receive Output
Level Adjust
(C53)
SYNTH 2
2nd LO
Input
75 MHz
Passband Adjust
(C17)
SYN1
1st LO
Input
AME Input
(AME option)
Carrier Level
Adjust (R51)
(AME option)
Transmit
Output Level
Adjust (R37)
Transmit
Output Level
Adjust (C65)
75 MHz
Passband Adjust
(C44)
TX OUT
Transmit
Output
Transmit
Output Level
Adjust (C24)
RX IN
Receive
Input
AGC
Input
TP1
1st LO
test point
