TM 11-5820-890-10-1
OPERATOR’S CONTROLS, INDICATORS, AND CONNECTORS
The RCU controls, indicators, and connectors are identical to those on the
RT-1523 (C)/U with the following exceptions (refer to the RCU front panel, page 4-1).
CAUTION
LOUDSPEAKER LS-685/U IS FOR USE WITH CONTROL, RECEIVER-
TRANSMITTER C-11561 (C)/U. ATTEMPTED USE WITH ANY OTHER
EQUIPMENT MAY RESULT IN PERMANENT DAMAGE TO THAT EQUIP-
MENT.
SPKR switch. Controls whether or not loudspeaker
LS-685/U is ON or OFF. SPKR should be set to OFF if loud-
speaker is not used. Loudspeaker is disabled when WHSP
function is used. Set to OFF whenever possible to con-
serve manpack battery life.
FCTN switch. Sets function of RCU. With the exception of
the ICM position, the RCU and radio FCTN switches are
identical. ICM position allows operator to communicate
with companion radio without transmitting a signal (COM-
SEC switch MUST be set to
) . TST position tests RCU
and radio circuits.
CHAN switch. Selects manual, 1 - 6, and CUE frequen-
cies. Selects FH hopset.
RCV/SlGNAL (receive/signal) display. Lights when com-
panion radio receives signal.
HUB Indicator. Only shows HUB life of RCU.
BATT/CALL (battery/call) button. Used to
check battery life condition of manpack RCU
and manpack radio. The first press indicates
the battery life condition of the manpack RCU.
The second press indicates the battery life
condition of the companion manpack radio
(when checking the manpack radio, the dis-
play shows " RT nn”). Also used to create a
ring tone ("CALL” is displayed on companion
radio) at the companion radio. FCTN switch
MUST be set to ICM to use the call function
(radio may call RCU regardless of RCU FCTN
switch setting).
4-2
