OPERATION - TM-11-5820-890-10-80106

TM 11-5820-890-10-8

Only those functions which differ from the radio are described below:

OPERATION

Speaker Switch: turns loudspeaker ON and OFF (volume is

controlled by the RCU VOL control, which deactivates the

loudspeaker when set to WHSP mode).

FCTN TST position: provides self-test of both RCU and radio.

FCTN ICM position: allows RCU and radio operators to talk over

connecting field wire when COMSEC is set to PT.

CHAN switch: enables RCU operator to select channel 1-6, CUE,

or MAN for the companion radio.

SIG display: lights at RCU when radio receives signal. (For

RT- 1523C/E, "RCU" is displayed when the radio receives a

signal.)

HUB indicator: shows status of RCU HUB only (radio HUB must

be checked by radio operator).

BATT button: checks status of RCU manpack battery when

pressed once; checks manpack radio battery status when

pressed a second time.

CALL button: enables RCU operator to create a tone and "CALL'

message at companion radio by setting FCTN to ICM and

pressing CALL and PTT at the same time. With radio FCTN set to

REM, the radio operator can call the RCU operator my merely

pressing the CALL button and PTT at the same time.

The following functions can be performed by the RCU operator located

REMOTE FUNCTIONS

up to 4 KM away from the radio:

Single channel frequencies may be loaded and offset.

ERFs may be sent and received.

Radio MODE may be changed (SC, FH, FH-M).

Radio FCTN may be changed (radio will transmit and receive only

in the REM position).

Radio channels may be changed.

COMSEC positions of PT and CT may be selected.

COMSEC keys may be selected by scrolling.

Radio data rates may be selected.

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