Section III TECHNICAL PRINCIPLES OF OPERATION

TM 11-5820-670-12

1-12.

ADDITIONAL EQUIPMENT REQUIRED. (CONT)

HOMING ANTENNA SYSTEM

Homing antenna system (AS-1922/ARC or equivalent) is required to perform homing operations.

INTERCOMMUNICATIONS CONTROL SET

Intercommunications control set (C-1611D/AIC or equivalent) is required to perform all modes of

operation.

INTERCONNECTING CABLES

Electrical harness and coaxial cabling to interconnect the major computer of the radio set and aircraft

interphone system are required.

Section Ill T E C H N I C A L P R I N C I P L E S O F O P E R A T I O N

Subject

Para

Page

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-13

Transmit Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14

Receive Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15

Homing Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16

Retransmit Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17

1-13.

GENERAL.

Radio Set AN/ARC-131, when installed with additional equipment (para 1-12), provides two-way

voice communications between aircraft in flight and between aircraft and ground stations. The radio

set is an fm receiver-transmitter with 920 channels in the frequency range of 30.00 to 75.95 MHz. It

can be used as a standard fm receiver-transmitter operating with carrier or tone squelch, and can

also be used as a homing signal receiver or as part of an airborne, radio-relay system. The radio set

is normally set to provide an output power of 10 watts but can be set to produce a 1 watt output for

limited range operations or retransmit operations.

1-8