Do not touch Army radio antenna while radio is transmitting. Antenna contains
high voltage which can cause serious injury.
Perform step b, (1) thru (5) in paragraph 5-7.3.1
Remove microphone from mounting. Key Army radio set by pressing and holding the PUSH-TO-
Speak into microphone using proper radio call signs and procedures.
A sidetone should now be heard in the loudspeaker. Request distant station
transmit to you and then release PUSH-TO-TALK button. Sidetone should stop.
Blower will continue to run If equipment is warm; otherwise, it will stop.
Listen to loudspeaker for signal from distant station and readjust SPEAKER control to obtain a
comfortable listening level.
If desired radio station cannot be reached on LOW power setting, repeat step c, (1)
thru (4) In paragraph 5-7.3.1, using HIGH power setting.
5-7.3.2 Commercial marine radios. These radios operate in the 156.250-162.550 MHz frequency range, develop up to
25 watts of radio frequency (RF) power, receive 50 channels for operational and environmental announcements, and
transmit on 46 channels. When barge is deployed in US coastal waters and marine radio is not being used for two-way
communications, monitor channel 16. Both USCG and commercial vessels initiate contact on this channel.
When using the radios for two-way communications, observe secure transmission procedures as
specified in unit Communication Electronics Operation Instructions.
Perform following to turn on the marine radio:
On marine radio power supply, set power switch to ON.
On marine radio (Figure 5-9), turn VOLUME control clockwise to mid-position on dial.
Perform the following to receive from a remote radio station:
On marine radio, turn CHANNEL selector switch to the desired channel in accordance with Table
5-2. In most instances channel 16 is used to establish initial contact and for DISTRESS and
SAFETY communications. Once contact is made on channel 16, the appropriate working
channel is selected and set.
Selection of channel 15 or channel 17 automatically reduces radio output power to
1 watt, in compliance with US FCC regulations.
Select/set the desired HI/LO power setting.
Turn SQUELCH control clockwise until background noise just disappears. Do not adjust control
beyond this point or the marine radio receiver sensitivity will be reduced.
When message is received, adjust VOLUME control to obtain desired listening level.