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TM 11-5821-333-12
1-22. POWER INPUT.
POWER INPUTS FOR RT/RCU OR DRA.
The primary source of power for the radio set components is the aircraft 28 V DC bus. Also, 115 V AC is used to
light the radio set front panels and the display. The 28 V DC and 115 V AC are connected to J1 on the RCU and
RT. The 28 V DC is connected to J1 on the DRA.
1-23. HOMING OPERATION.
ARRANGEMENT FOR HOMING OPERATION
In the homing mode, the pilot uses a cockpit indicator to steer to a radio located in another aircraft or on the
ground. The RT sends steering, signal strength, and station approach signals to the ID-1351A indicator or equiv-
alent. The steering right and steering left signals drive a steering indicator meter, The station approach signal
drives a signal strength meter. The signal strength signal drives a flag. The flag is activated when signal strength
is greater than -103 dBm at the homing antennas.
Homing antenna signals are routed to J4 and J5 on the RT. The communications antenna is disconnected in
homing mode, but it is reconnected automatically during any transmission. The communications antenna is not
used to receive in homing mode.
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