(line of sight) between the search aircraft and the
The AN/PRC-63 radio set can be worn as part
of the aircrewmans flight clothing or life jacket;
it is secured to the garment by a strap attached
to the slots in the battery housing. The automatic
deployment device supplied with the radio set,
when suitably connected to the parachute harness
of the aircrewman by the user, will allow
automatic transmission of the beacon tone upon
parachute deployment. The radio can also be
packed in a seat pack and, with the same
deployment device suitably connected, can be
automatically placed in beacon tone transmission
mode upon ejection from the aircraft. The lanyard
attached to the deployment device has been
designed to withstand a pull force of 20 pounds
The downed aircrewman may remove the
radio set from his flight clothing, life jacket, or
survival kit and change its mode of operation to
either voice transmit or voice receive by pressing
the appropriate end of the rocking toggle actuator.
In the event that he becomes injured, disabled,
or otherwise incapable of selecting the desired
mode of operation, the radio set will continue to
transmit MCW beacon signals until the battery
power is exhausted.
Function and Use of Operating Controls
The function and use of the operating controls
are described in table 5-1.
NOTE: When POWER ON/OFF actuator
is in OFF position or in ON position with
the deployment device installed, all other
operating controls are disabled.
The radio set can be held in either hand and
operated by the thumb or fingers, respectively.
In the normal operating position, the speaker/
mike faces the operator.
NOTE: During operation, the radio set
must be held in the upright position
(antenna vertical), or loss of transmission
or reception will result. For best results,
hold the radio set approximately 1 to 2
inches from the mouth when speaking, or
ear when listening.
In the receive mode the sound is con-
trolled by the volume control knob, which
is located in the upper corner of the radio
set (opposite the flexible whip antenna) and
marked VOLUME MAX. Full clockwise rota-
tion gives maximum volume; full counter-
clockwise rotation gives minimum volume. The
sound of the beacon monitoring tone is also
controlled by this knob.
NOTE: Neither the beacon nor voice-
transmitter output is affected by the
position of the volume control knob.
Table 5-1.Operating Controls and Functions
Radio set is in storage condition.
Radio set is in beacon mode of operation.
Radio set is in standby condition ready for
Deployment device installed
Radio set is in receive mode.
PRESS AND HOLD
Radio set is in transmit mode.
PRESS AND HOLD