TB 9-6625-2077-24
(17) Adjust MODULATION LEVEL control for an indication of 10 kHz peak
deviation on measuring receiver.
(18) Adjust A5R26 (fig. 1) for an indication of 10 kHz on MODULATION meter (R).
(19) Set FM METER RANGE switch to 75 kHz.
(20) Adjust MODULATION LEVEL control for an indication of 75 kHz peak
deviation on measuring receiver.
(21) Adjust A5R23 (fig. 1) for an indication of 75 kHz on TI MODULATION meter (R).
(22) Set POWER switch to OFF and disconnect test equipment.
(23) Reinstall assembly A5 and extender board (fig. 1) in proper locations.
(24) Set POWER switch to ON.
a. Performance Check
(1) Position controls as listed in (a) through (c) below:
(a) RF OUTPUT switch to +10 dBm.
(b) TUNING RANGE switch to 4-20 MHz.
(c) MODULATION switch to AM 1 kHz.
(2) Connect TI RF OUTPUT to measuring receiver power sensor
(3) Adjust TUNING COARSE and FINE controls for an indication of 10.00 MHz
(4) Set measuring receiver to frequency counter mode to determine center frequency.
(5) Adjust RF OUTPUT LEVEL control for a 0 dBm indication on TI RF
OUTPUT meter.
(6) Set measuring receiver to measure AM depth.
(7) Adjust MODULATION LEVEL control for 20 percent modulation on TI
MODULATION meter. If measuring receiver does not indicate between the values listed
in table 11 for the MODULATION LEVEL setting, perform b below.
(8) Set measuring receiver to measure modulation distortion.
(9) Measuring receiver will indicate 1 percent distortion or less.
(10) Repeat technique of (5) through (8) above for remaining settings listed in
table 11. If measuring receiver indications are not within limits specified, perform b below.
Test instrument
Measuring receiver
Measuring receiver
modulation
indications
distortion indications
(%)
(%)
(%)
Min
Max
20
18.80
21.20
<1
40
37.6
42.4
<1