TB 9-4931-488-35
(3) Disconnect multimeter INPUT HI from A5TP6 (fig. 3) and connect to OUTPUT
A5TP2 (fig. 3). Adjust OFFSET A5R8 (fig. 3) for a 0.000 0.001-V dc multimeter indication
(R).
(4) Set FM switch to CAL. Disconnect multimeter INPUT HI from A5TP2 (fig. 3)
and connect INPUT HI to BUFFER IN A5TP5 (fig. 3). Adjust FM CAL A13R3 (fig. 3) for a
(5) Disconnect multimeter INPUT HI from A5TP5 (fig. 3) and connect to
VARACTOR ANODE A7TP2 (fig. 3). Adjust A7R19 (fig. 3) for a -14.70 0.01-V dc
(7) Position controls as listed in (a) through (j) below.
NOTE
Some of these TI control settings are repeated from
performance check because of their importance to adjustment
procedure.
(a)
LEVEL VOLTS pushbutton pressed.
(b)
AM switch to OFF.
(c)
FM switch to INT.
(d)
FM control fully ccw.
(e)
MODULATION FREQUENCY RANGE switch to FIXED FREQ 1 kHz.
(f)
PEAK DEVIATION switch to 320 kHz.
(g)
RANGE MHz switch to 64-32.
(h)
FREQUENCY TUNE control for FREQUENCY MHz display indication of
50 MHz.
(i) OUTPUT LEVEL switch to +10 dBm (10 dB switch to +10 and 1 dB switch
to 0 for option 004).
(j) OUTPUT LEVEL vernier control(s) fully cw.
(8) Set measuring receiver to measure peak FM with a 50 Hz high-pass and 15 kHz
low-pass filter. Set tuning to track mode (key in 4.1 SPCL).
(9) Adjust FM control for a 320 kHz measuring receiver indication. Set audio
analyzer to measure distortion at 1 kHz.
(10) Adjust POS SHAPE A7R12 and NEG SHAPE A7R41 (fig. 3) for minimum
indication (<3 %) on audio analyzer (R).
(11) Adjust FREQUENCY TUNE control slowly from 32 to 64 MHz while observing
audio analyzer. If audio analyzer does not indicate ≤3 %, repeat (9) and (10) above while
adjusting for best intolerance condition across the band.
(12) Position controls as listed in (a) through (d) below.
(a) FM switch to AC.
(b) PEAK DEVIATION switch to 80 kHz
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