Audio output and distortion test

SB 740-91-01

StepSetting and InstructionsNormal Indication

2(7) Adjust AN/URM-103 LO RF pV control

(cont.)for minimum output.

(8) Check to see that AN/URM-103 Deviation

Meter still indicated 3 kHz. Adjust

deviation adjust control, if necessary.

(9) Slowly advance AN/URM-103 control untilLO RF lV control set-

Call indicator lights. Note setting ofting should be 0.5 pV

LO RF lV control.or less.

(10) Slowly reduce inputs to 0.4 V. Tone(Call indicator remains

squelch should remain broken.lighted.)

(11) Repeat for frequency of 64.05 MHz by

adjusting the AN/URM-103 controls as

follows:

(a) Band Switch. D

(b) RF Tuning. 64.05 MHz

(12) Check to see than AN/URM-103 Deviation

Meter still indicates 3 kHz. Adjust

deviation adjust control, if necessary.

(13) Slowly advance AN/URM-103 control untilLO RF lV control set-

Call indicator lights. Note setting ofting should be 0.5 liV

LO RF PV control.or less.

3Audio output and distortion test

(a) Connect the equipment in accordance

(b) Energize all equipment and allow for

a 5 minute warm-up before proceeding.

(1) Display Control. Set for desired

display time.

(2) Sensitivity. 100 V

(3) Gate Time. (sec-L):106

(4) Function. Freq

(d) On AN/URM-103, set controls as follows:

(1) Band Switch. D

(2) RF Tuning. 60 MHz

(3) Deviation Range. 10 kHz

(4) Function. 1000 Hz

(5) Deviation Level. Set for 8 kHz

on Deviation Meter.

(6) LO RF Set to Line. Right-hand

meter to red line.

(7) RF Output. LO

B-48