TB 9-6625-2077-35
Table 6. Attenuation Accuracy (Tuned Level) - Continued
Measuring receiver
RF OUTPUT
indications
switch
(dBm)
settings
Min
Max
-60
-59.000
-61.000
-70
-69.000
-71.000
-80
-79.000
-81.000
1
-90
-89.000
-91.000
-100
-99.000
-101.000
-110
-108.000
-112.000
1 Press CALIBRATION CALIBRATE key if RCL indicator is on.
b. Adjustments
(1) Set POWER switch to OFF.
(2) Remove assembly A6 and reconnect using extender board (fig. 1).
(3) Set POWER switch to ON.
(4) Set RF OUTPUT switch to 0 dBm.
(5) Set measuring receiver controls to measure power and adjust RF OUTPUT
LEVEL control for a +3.00 dBm indication on measuring receiver.
(6) Adjust A6R31 (fig. 1) for a +3.00 dBm indication on TI RF OUTPUT meter (R).
(7) Adjust RF OUTPUT LEVEL control for a -7.00 dBm indication on measuring
receiver.
(8) Adjust A6R25 (fig. 1) for a -7 dBm indication on TI RF OUTPUT meter (R).
(9) Set POWER switch to OFF and reinstall assembly A6 and extender board (fig. 1)
in proper locations.
(10) Set POWER switch to ON.
10. Frequency Modulation
a. Performance Check
(1) Position controls as listed in (a) through (d) below:
(a) RF OUTPUT switch to +10 dBm.
(b) TUNING RANGE switch to 16-90 MHz (16-80 MHz).
(c) MODULATION switch to FM 150 Hz.
(d) FM METER RANGE switch to 10 kHz.
(2) Connect TI RF OUTPUT to measuring receiver power sensor, and connect
measuring receiver MODULATION OUTPUT/AUDIO INPUT to audio analyzer INPUT
HIGH.
(3) Adjust TUNING COARSE and FINE controls for an indication of 20.00 MHz
on FREQUENCY display.
