TB 9-6625-1999-35
a. Performance Check
(1) Connect frequency counter to pin 2 of V10 (fig. 1) and chassis ground.
(2) Set CRYSTAL CALIBRATOR switch to 1MC. If frequency counter does not
indicate between 999.900 and 1000.100 kHz, perform b below.
(3) Set CRYSTAL CALIBRATOR switch to 100 kHz. If frequency counter does
not indicate between 99.990 and 100.010 kHz, perform b below.
(4) Set CRYSTAL CALIBRATOR switch to OFF.
b. Adjustments. Adjust
C41 (fig. 1) for
best compromise between allowable limits
in a (2) and (3) above (R).
10. Frequency Dial Accuracy and Drift
a. Performance Check
(1) Connect frequency counter to RF Output 50 Ω.
(2) Position controls as listed in (a) through (d) below:
(a) MODULATION SELECTOR switch to cw.
(b) ATTENUATOR switch to .3 VOLTS.
(c) ATTENUATOR VERNIER control for a full-scale indication on R.M.S.
VOLTS meter.
(d) CALIBRATE control to align cursor to FREQUENCY centerline.
(3) Position controls to settings listed in table 3. Frequency counter will indicate
within limits specified.
(4) Set RANGE switch to 530KC-1800KC and adjust FREQUENCY dial for a
1 MHz indication on frequency counter. Wait 1 minute and record frequency
counter indication.
(5) Wait an additional 10 minutes and read frequency counter. Frequency counter
will indicate within 50 Hz of value recorded in (4) above.
Test instrument
Frequency counter indications
FREQUENCY dial
Min
Max
RANGE switch settings
settings
50KC - 170KC
50
49.5 kHz
50.5 kHz
70
69.3 kHz
70.7 kHz
90
89.1 kHz
90.9 kHz
120
118.8 kHz
121.1 kHz
150
148.5 kHz
151.5 kHz
170
168.3 kHz
171.7 kHz
165KC - 560KC
560
554.4 kHz
565.6 kHz
360
356.4 kHz
363.6 kHz
165
163.35 kHz
166.65 kHz