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CHAPTER 2. OPERATING INSTRUCTIONS - TM-11-5820-670-120021
Up
TM-11-5820-670-12 Radio Set AN/ARC-131(NSN
Next
Section II OPERATING UNDER USUAL CONDITIONS


TM 11-5820-670-12
2-2.
CONTROLS AND INDICATORS. (CONT)
FUNCTION
CONTROL OR INDICATOR
KEY
Four-position switch. OFF position turns off primary
Mode control switch
1
power to radio set. T/R position applies power and al-
lows normal two-way voice communication. RETRAN po-
sition applies power and allows radio set to operate as
part of a two-way relay station. HOME position applies
power and allows radio set to operate as a homing signal
receiver.
Three position switch. DIS position disables all squelch
SQUELCH mode selector
2
circuits. CARR position sets squelch circuit to operate
switch
normally in presence of any carrier. TONE position
opens (unsquelches) only at selected signals (signals
containing a 150 Hz tone modulation).
Adjusts audio output level of the radio set.
VOL (volume control)
3
Selects and displays the tens MHz digit from 3 to 7 of the
Tens MHz frequency
4
operating frequency range.
selector
Selects and displays the units MHz digit from 0 to 9 of the
Units MHz frequency
5
operating frequency range. (When tens MHz frequency
selector
selector is set to 7, this units selector only has a
range of 0 to 5.)
Tenths MHz frequency
Selects and displays the tenths MHz digit from 0 to 9 of the
6
operating frequency range.
selector
Selects and displays the hundreds MHz digit, either 0
Hundreds MHz frequency
7
or 5, of the operating frequency range.
selector
2-2


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