TB 9-6625-1999-35
b. Adjustments. No adjustments can be made.
23. Frequency Output and Drift
a. Performance Check
NOTE
TI should be energized for at least 2 hours prior to performing
this check.
CAUTION
Throughout procedure, adjust ATTENUATOR VERNIER
control fully ccw before changing RANGE switch setting.
(1) Position controls as listed in (a) through (g) below.
(a) CALIBRATE control until index line is aligned with FREQUENCY
dial centerline.
(b) ATTENUATOR switch to .3 VOLTS.
(c) RANGE switch to 530KC-1800KC.
(d) AF control to midrange.
(e) VERNIER control for a full-scale indication on R.M.S. VOLTS meter.
(f) MODULATION AMPLITUDE fully ccw.
(g) MODULATION SELECTOR to CW.
(2) Connect frequency counter to RF OUTPUT 50 Ω.
(3) Adjust FREQUENCY control for a 1,000,000 Hz indication on frequency counter
and wait at least 10 minutes. Frequency counter will indicate between 999,950 and
1,000,050 Hz.
(4) Set RANGE switch to 50KC-170KC and adjust FREQUENCY dial to 50KC.
Frequency counter will indicate between 49.5 and 50.5 kHz.
(5) Position controls as listed in table 6. Frequency counter will indicate within
limits specified.
Frequency counter indications
Test Instrument
(MHz)
RANGE
FREQUENCY
Min
Max
switch settings
dial settings
50KC - 170KC
50
0.0495
0.0505
100
0.099
0.101
170
0.1683
0.1717
165KC - 560KC
165
0.16335
0.16665
300
0.297
0.303
560
0.554
0.5656
530KC - 180KC
530
0.5247
0.5353
