TB 9-6625-1999-35
(a) RANGE switch to 530KC-1800KC.
(b) FREQUENCY dial to 1000KC.
(c) MODULATION SELECTOR switch to INT. 1000∼.
(d) MODULATION AMPLITUDE control for a 50 percent modulation
indication on PERCENT MODULATION meter.
(e) ATTENUATOR VERNIER control for 1 V on R.M.S. VOLTS meter.
(3) If measuring receiver does not indicate between 45 and 55 percent modulation,
perform b below.
(4) Adjust MODULATION AMPLITUDE control for 90 percent modulation
indication on MODULATION meter. If measuring receiver does not indicate between 85
and 95 percent modulation, perform b below.
b. Adjustments
(1) Adjust MODULATION AMPLITUDE control for a 50 percent indication on
PERCENT MODULATION meter (R).
(2) Adjust ATTENUATOR VERNIER control for a 0.2 V indication on R.M.S.
VOLTS meter. If measuring receiver does not indicate between 45 and 55 percent
measuring receiver (R).
(3) Repeat a above.
NOTE
If CARRIER ZERO SET R35 was adjusted in (2) above,
repeat paragraphs 11 and 12 above.
14. Modulation Output Distortion
a. Performance Check
NOTE
Reinstall RF oscillator-RF amplifier shield assembly if removed
in 11 b above.
(1) Connect audio analyzer input to MODULATION INPUT-OUTPUT.
(2) Set MODULATION SELECTOR switch to INT. 1000∼. Audio analyzer will
indicate less than 1 percent distortion.
(3) Set MODULATION SELECTOR switch to INT. 400∼.
Audio analyzer will
indicate less than 1 percent distortion.
b. Adjustments. No adjustments can be made.
