TB 9-4931-488-35
(11) Release COUNTER MODE LOCK ON pushbutton and set RF OUTPUT
OFF/ON switch to OFF.
b. Adjustments
(1) Position controls as listed in (a) through (f) below.
(a) FM k/MHz pushbutton pressed.
(b) MODULATION FREQUENCY RANGE switch to FIXED FREQ 1 kHz.
(c) FM switch to OFF.
(d) PEAK DEVIATION switch to 10 kHz.
(e) PEAK DEVIATION vernier control fully ccw.
(f) RANGE MHz switch to 4-2.
(2) Connect multimeter to A2TP2 (fig. 1) and chassis ground. Adjust DET OFFSET
A2R15 (fig. 1) for a 0.000 1-mV dc multimeter indication (R).
(3) Disconnect multimeter from A2TP2 and connect to A4TP1 (fig. 1). Adjust A4R10
(fig. 1) for a
0.000 1 mV dc
multimeter indication (R).
(4) Set FM switch to INT and adjust PEAK DEVIATION vernier control for a
(5) Adjust A4R19 (fig. 1) for a TI meter indication of 10 on 0 to 10 scale (R).
(6) Position controls as listed in (a) through (g) below:
(a)
LEVEL VOLTS pushbutton pressed.
(b)
AM switch to INT.
(c)
AM control fully ccw.
(d)
RANGE MHz switch to 256-128.
(e)
FREQUENCY TUNE control for FREQUENCY MHz display indication of
190 MHz.
(f) OUTPUT LEVEL vernier control to CAL.
(g) OUTPUT LEVEL switches to +10 dBm.
(7) Disconnect multimeter from TI and connect RF OUTPUT to measuring receiver
input and set RF OFF/ON switch to ON.
(8) Set measuring receiver to measure AM with AVG DETECTOR.
(9) Adjust AM control for a measuring receiver indication of approximately 20%.
Press measuring receiver RATIO % key.
(10) Set OUTPUT LEVEL switches to 0 dBm. Adjust DET A26A1R19 (fig. 3) for a
measuring receiver indication of 100% (R).
(11) Set OUTPUT LEVEL switches to +10 dBm. Measuring receiver will indicate
between 99.5 and 100.5%; if not, repeat (9) and (10) above while adjusting A26A1R19 (fig.
1) for best in-tolerance condition.
(12) Set measuring receiver to measure RF power.
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