TM 55-1930-209-14&P-12
d.
Make sure circuit breakers are closed (ON) for the radio equipment specified in the following'
Radio Equipment
Circuit breaker no.
Panel
Location
Army radio
3P14
24 Vdc power panel
Workshop on aft bulkhead
Army radio
12P13A-4
Isolating
Workshop on aft bulkhead
power supply
receptacle panel
Marine radio
10P13A-8
Emergency light
ROWPU space on forward
and radio power
panel
supply starboard
supply
Walkie-talkie
N/A
N/A
N/A
battery charger
2-12 Operating procedures. Radio operators must comply with FCC and Army radio communications procedures
when operating any radio. These procedures are available in FCC regulations, Army radio training materials and
SSI/SO. They are not part of these instructions.
2-12.1 Army radio
a.
Perform following to turn on Army radio'
(1)
Turn power supply (Figures 2-5 and 2-) ac voltage selector switch to 115 V 50-60 400 cycle position.
(2)
Turn power supply POWER ON/OFF switch to ON Green ac ON indicator lamp should light.
(3)
Turn radio (Figure 2-6) BREAKER-RESET power switch to LOW.
(4)
Set radio LIGHT selector switch to ON so that LAMP and CALL control indicators come on.
CAUTION
Do not use following frequencies because they will cause improper operation of Army radio: 33.90
MHz, 45.20 MHz, 56.50 MHz, and 67.80 MHz. Do not use frequencies that are separated exactly by
5.75 MHz or 23.00 MHz.
b.
On Army radio (Figure 2-6), perform following to receive transmissions from another Army radio station:
NOTE
Radio operator must obtain assigned frequencies (primary and alternate), network and call signs for
barge radio and other stations to be contacted. Frequencies, call signs, and network organizations are
obtained from SSI/SOI. Unit headquarters provides extracts of SSI and SOI.
(1)
Turn BAND selector switch to either A or B position for desired frequency band.
NOTE
When using SQUELCH control, radio background noise is silenced when transmitter is not keyed.
Newer model FM radio sets use a squelch control which automatically disables radio squelch circuitry.
For reliable communications, make sure that both distant radio stations and barge and workboat radio
squelch controls are in same position, i.e., NEW ON or OLD ON. If unsure of distant station squelch
control setting, initially tune with squelch in either OFF position.
(2)
For SQUELCH operation, turn SQUELCH control to either NEW ON or OLD ON, as appropriate.
(3)
Turn MC TUNE control to desired MHz frequency MC TUNE control provides manual tuning of radio in 1
MHz steps as indicated by outer section of dial window.
(4)
Turn KC TUNE control to desired kHz frequency KC TUNE control provides manual tuning of radio in 0 05
MHz steps as indicated by Inner section of dial window.
2-9
