AGC Alignment
1) Connect digital Voltmeter to circuit board PTBM059 terminal 15 (Q20, Q22 AGC input) and
chassis ground.
2) Set the transceiver to channel 60.
3) Rotate the RF Gain control fu lly clockwise.
4) Adjust RV8 for 2V reading.
AM Receiver Sensitiv/'ty
1) Set the signal generator to 27.655 MHz with 1 kHz 30% modulation.
2) Set the transceiver tuned to channel 60.
3) Set the Mode selector to AM position.
4) Adjust T7, T8, T9, T10, T13, T14 and T15 fot maximum audio output across speaker dymmy
resistor.
Note: Keep generator output as low as possible to avoid AGC action through this alignment.
5) After completing above procedure, rotate T7 to decrease the audio output by 2 dB.
Squelch Alignment
1) Set the Mode selector to AM position.
2) Set the signal generator to provide RF input signal of 300
pV
1 kHz 30% modulated and rotate
the Squelch control to the fu lly clockwise position.
3) Adjust RV9 so that the audio appears on scope.
S-Meter Alignment
1) Set the Mode switch to AM position.
2) Select channel 60 (Mid band).
3) Set the signal generator to provide 100 juV (40 dB) output.
4) Adjust RV7 so that the S-meter pointer indicates '9'.
A. Properly adjusted transmitter.
C. Excessive modulation — Adjust
RV11 "counterclockwise.
E. Undermodulation — Adjust
RV11 clockwise.
B. Unequal tones — Adjust generator
Outputs to balance.
D. Final transistor incorrectly
F. Similar to A but showing hum —
Check for proper testing condition.
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