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TM 11-5820-890-30-5
2-18. FILL OPERATION.
The ECCM module requires electronic data for FH operation. The data is in the form of TRANSEC variables,
hopsets, and lockout sets. The process of providing the data is called the fill operation. It can be performed two
ways. All data can be loaded locally using the RT AUD/FILL connector. The second method is the ECCM remote
fill (ERF). It can only be used for hopsets and lockout sets. ERF is relatively automatic. The ECCM module adds a
preamble to the transmitted data that identifies it as fill data. The ECCM module in the receiving RT detects the
preamble and stores the data in holding memory.
Local fill is illustrated in figure 2-11. The fill is initiated by the operator. The ECCM module puts a -6.75 V pulse on
the FILL REQ line. The request is routed to the AUD/FILL connector. The FILL INFO signal is input from the fill
device. It is the serial data stream that contains the variable to be stored in the ECCM module. The FILL IA is a
clock signal from the fill device. It is used to synchronize the RT with the data stream.
The audio power supply buffers the signals for isolation. The signals are processed to produce the inputs for the
ECCM module. FILL IA is processed into FILL CLK and FILL DET. FILL CLK follows FILL IA at rates from 1 to 4 kHz.
When the fill device is attached, FILL IA is detected and FILL DET drops to logic 0. FILL SEL is created from
processing FILL REQ and FILL IA. FILL SEL will drop to logic 0 at the same time as FILL REQ.
The RT has two interlock switches. If either cover is removed, the TRANSEC ZERO-N line is grounded. If that
happens, the TRANSEC variable stored in the ECCM module will be zeroized.
2-19. REMOTE CONTROL OPERATION.
When the RT FCTN switch is set to REM, it can be controlled by a remote control unit. There are two remote
control modes. One mode provides for complete remote control of all front panel functions. It is called the
2-WIRE mode. It allows remote input/output of audio and data signals. The other mode is called the 6-WIRE
mode. Remote control is limited to RT MODE, RF, and CHAN. The audio and data signals are input and output at
the RT. The control-monitor uses this mode. When the remote control unit establishes contact with the RT, it
identifies which mode the RT is to use.
The two modules that provide the remote control capability are the two-wire interface (1A6) and the remote I/O
module (1A2). See figure FO-10. The link between the RT and the remote control unit is the 2 WIRE I/O and 2
WIRE I/O RTN lines. Control signals are FSK modulated onto a 2880-Hz carrier. Audio and data signals are
modulated onto a 40-kHz carrier (2-wire mode only).
The two-wire interface sends the received signals on the 2-WIRE I/O lines. When receiving, it separates the two
carriers. The control information is routed to the remote I/O module. The audio/data information is routed to the
switching module. The remote l/O module decodes the control information and routes it to the control module.
During remote operation, the control module executes instructions from the remote l/O module, not the front
panel. When sending data to the remote control unit, the above process is reversed.
The remote control unit can turn off the RT. The two-wire interface puts 6 V dc on the PS ON-N line to disable the
power supply outputs. The two-wire interface will draw power from the RT dc power input that is routed through
the front panel display board.
The remote I/O module has a self-test function. It is initiated when the RT is in remote and the BATT/CALL key and
the handset PTT switch are pressed. If self-test is passed, “CALL” will be displayed. If it is not, “ FAIL4” is
displayed.
The following signals must be present for proper remote operation. See figure FO-10.
2-22
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