TB 9-6625-2077-24
b.
Adjustments
(1) Set POWER switch to OFF.
Remove assembly A5 and reconnect, using
extender board (fig. 1).
(2) Position controls as listed in (a) through (h) below:
(a) POWER switch to ON.
(b) MODULATION switch to CW.
(c) MODULATION LEVEL control fully ccw.
(d) FM METER RANGE switch to 10 KHz.
(e) TUNING RANGE switch to 16-90 MHz (16-80 MHz).
(f) TUNING FINE control to midrange.
(g) TUNING COARSE control cw less one-half turn.
(h) RF OUTPUT LEVEL control fully cw.
(3) Set audio analyzer controls to measure dc volts and connect audio analyzer
INPUT HIGH to A5TP2 and A5TP3 (common) (fig. 1).
(4) Adjust A5R5 (fig.1) for a -11.000 V dc indication on audio analyzer.
(5) Disconnect audio analyzer and set MODULATION switch to FM 150 Hz.
(6) Set audio analyzer controls to measure frequency and connect audio analyzer
INPUT HIGH to A5TP4 and A5TP3 (common) (fig. 1).
(7) Adjust A5R27 (fig. 1) for an indication of 150.000 Hz on audio analyzer (R).
(8) Set MODULATION switch to FM 400.00 Hz. Adjust A5R29 (fig. 1) for an
indication of 400.00 Hz on audio analyzer (R).
(9) Set MODULATION switch to FM 1 KHz.
Adjust A5R31 (fig. 1) for an
indication of 1000.00 Hz on audio analyzer (R).
(10) Set audio analyzer controls to measure distortion.
NOTE
Do not adjust A5R33 (fig. 1) to full cw position. This action will
cause the output of the internal oscillator to become zero volts.
(11) Alternately adjust A5R33 and A5R34 (fig. 1) for minimum distortion, less than 1
percent (R).
(12) Disconnect the audio analyzer from equipment setup.
(13) Set MODULATION switch to FM EXT and adjust A5R39 (fig. 1) for a 0
indication on TI MODULATION meter (R).
(14) Set MODULATION switch to FM 1 kHz.
(15) Connect RF OUTPUT to measuring receiver power sensor.
(16) Set measuring receiver to measure modulation rate.
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