TB 9-6625-2151-24
(a) Press DISPLAY key to select TRMT.
(b) Press NOR pushbutton.
(c) Press SET UP TRMT 600 pushbutton.
(d) Press MEASUREMENT MEAS key to select LEVEL FREQUENCY.
, STEP UP, STEP DOWN, and
keys until TI right display
(e) Press
indicates 85.000 kHz.
(f) Adjust OUTPUT LEVEL control until left display indicates 0.0 dBm.
(3) Set audio analyzer to measure frequency. Audio analyzer will indicate between
84.996 and 85.004 kHz.
(4) Press IMPULSE NOISE DISPLAY F2 1004 key.
(5) Set audio analyzer to measure distortion in dB and input to floating. Audio
analyzer will indicate -50 dB.
b. Adjustments. No adjustments can be made.
13. Peak-to-Average Ratio (AN/USM-485 AND 4935A Options 002 and 003 Only)
a. Performance Check
(1) Connect calibrator OUTPUT HI and LO to TI left TRMT/ RCV 310.
(2) Press pushbuttons and keys as listed in (a) through (d) below:
DISPLAY key to select RCV.
(a)
REV pushbutton.
(b)
SET UP TRMT 600 and RCV 600 pushbuttons.
(c)
MEASUREMENT MEAS key to select P/AR.
(d)
(3) Set calibrator for a -3.9 dBm, 300 Hz output. If TI left display does not indicate -
30 dBm, perform b (1) through (10) below.
(4) Set calibrator frequency to 1000 Hz. If TI left display does not indicate 0 dBm,
perform b (1) through (10) below.
(5) Set calibrator frequency to 2300 Hz. If TI left display does not indicate -10 dBm,
perform b (1) through (10) below.
(6) Press DISPLAY key to select TRMT. If right display does not indicate between
99 and 101, perform b (11) below.
(7) Vary OUTPUT LEVEL control to obtain a left display indication between -12
and -1 dBm. Right display indication will not change by more than 1 P/AR unit.
b. Adjustments
(1) Press calibrator RESET key and disconnect from TI.
(2) Connect left TRMT/RCV 310 to right RCV/TRMT 310.
(3) Press MEASUREMENT MEAS key to select LEVEL FREQUENCY.
CHANGE 1 13
