TM 11-5820-890-30-4
2-2.
CONTROL SECTION. Continued
Figure 2-3.
Control Section Module Locations
The remote I/O module and two-wire interface provide the remote operating capability. The two-wire interface
sends and receives information to and from the remote control unit over a two-wire link. Control information is
encoded using frequency shift keying (FSK). It converts instructions received into a digital data stream for the
remote I/O module. A microprocessor in the remote I/O module interprets the instructions and exchanges data
with the control module. During remote operation, the control module executes instructions from the remote I/O
module instead of the front panel.
Remote operation is described in detail in paragraph 2-19.
The switching module functions like a railroad switching yard. Many signals are routed between modules through
the switching module.
The path the signals take is determined by control input signals. It also performs the
following functions.
Bit synchronization.
Premodulation filtering.
Tone squelch.
Notch Filtering.
Modulation level control.
Generation of clock frequencies using the 3.2-MHz clock signal from the synthesizer.
Input and output control during retransmit operation.
The switching module is involved in most functions of the RT.
2-5
