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SB 740-91-01
StepSetting and InstructionsNormal Indication
1Frequency accuracy
With an RT unit in transmit, see if reciver will
pick up the RT unit's transmission. Frequencies
used should be 30.05, 52.05, and 75.95 MHz. Ver-
ify tone quality and function of volume control
during this test. Volume control should be checked
for noisiness and flat or "dead" spots.
2Squelch sensitivity
(a) Noise (Old) operated squelch.
(1) Connect the equipment in accordance
(2) On AN/USM-207, set the controls as follows:
(a) Display Control . Set for desired dis-
play time.
(b) Sensitivity. 100 V
(c) Gate Time. (sec-1):16
(d) Function. Freq
(3) On AN/URM-103, set the controls as follows:
(a) Band Switch.C
(b) RF Tuning: 41.05 MHz
(c) Deviation Range. 10 kHz
(d) Function. 1000 Hz
(e) Deviation Adjust. For 8 kHz on Devia-
tion Meter.
(f) LO RF Set to Line. Right-hand meter
to red line
(g) RF Output. LO
(4) On Receiver R-442, set controls as follows:
(a) Band. A
(b) Light.On
(c ) MC TUNE KC. 41.05 MHz
(d) Squelch. Old on
(e) Volume. Fully counterclockwise
(f) Power. On reset
(5) Press Reset Switch on AN/USM-207
(6) Adjust AN/URM-103 RF tuning control for
41.05 MHz indication on the AN/USM-207.
(7) Adjust AN/URM-103 RF LO uV control for
minimum output.
(8) Slowly advance AN/URM-103 LO RF PV con-RF Attenuator micro-
trol until Call indicator lights. Notevolts control setting
setting of control.should be 0.7 iV or
less.
B-46

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