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TM 11-5820-890-20-2
1-19
1.8.
DESCRIPTION OF COMPONENTS. Continued
FCTN
SWITCH
MODE
SWITCH
COMSEC
SWITCH
CHAN
SWITCH
DIM
CONTROL
RF PWR
SWITCH
VOL/WHSP
CONTROL
KEYBOARD
AUD/FILL
CONNECTOR
(J3)
AUD/DATA
CONNECTOR
(J4)
SPKR
SWITCH
SPKR
CONNECTOR
(J2)
SYSTEMS
CONNECTOR
(P1)
DISPLAY
CONTROL, RECEIVER TRANSMITTER C 11561(C)/U (RCU)
LS 685/U
LOUDSPEAKER, CRYSTAL
NOTE:
Handset, Battery Box, and LS 685
Loudspeaker are issued with the RCU
Remote control unit (RCU) is the common name for the Control, Receiver Transmitter C 11561(C)/U. The front
panel is the same as the RT 1523 series except for the following: a speaker switch replaces the antenna port,
ICM replaces REM on the function switch, a speaker connector replaces the RXMT connector, and a receive
signal indicator replaces the signal strength/transmit indicator. The RCU front panel controls allow the user to
perform all RT capabilities up to 4 km away. An exception to these capabilities is the loading of hopset/transec
variables. The RCU contains no frequency hopping circuitry, therefore the RT's circuitry is used for this mode of
operation. The RT must be loaded with the necessary hopset/transec at the RT front panel. The RCU is capable
of an internal self test and of initiating an RT self test, to determine if one of the units is faulty.
The RCU and RT are connected with field wire via the binding posts on the VAA or battery box. The RCU
display will read OPEN if the RT function switch is not placed in REM, the field wire is disconnected or open, or
one of the system units has an open in the two wire path.
The LS 685/U loudspeaker is installed on the RCU front panel speaker connector J2 for dismounted
applications.
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