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TO 31R2-2TRC199-1
5-1
CHAPTER 5.0 THEORY OF OPERATION
Section I. FUNCTIONAL SYSTEM(S) OPERATION
5-1
GENERAL.
This section describes the theory of operation of the tactical repeater. From both technical and operational standpoints,
the tactical repeater is designed to be a component of a communications system. It must function in conjunction with
other receiver-transmitters to perform receiver-transmitter communication. However, it does not depend on other
receiver-transmitters for its proper functioning or performance.
The tactical repeater operates in the 30-88, 136-174, and 403-470 MHz frequency bands, retransmitting analog frequency
modulation (FM), or 12 kbps or 16 kbps Continuously Variable Slope Delta Modulation (CVSD) digitized voice. The
transmitter output consists of a single channel frequency-modulated carrier. The transmitter power output as measured
at the antenna port is selectable at 2 or 10 watts. The tactical repeater is COMSEC transparent and does not have internal
COMSEC components. It can pass both encrypted and unencrypted traffic. The tactical repeater provides extension of
the communication range for base stations and receiver-transmitters by providing a receive/retransmit capability without
the need to decrypt/encrypt the transmission. It operates as a self-contained/stand-alone unit in an unprotected
environment.
5-2
FUNCTIONAL SYSTEM(S) OPERATION.
(See Figure 5-1.) Paragraphs 5-2.1 through 5-2.10 provide a limited system description of the tactical repeater. The
functional diagrams (Figure 5-1) show the interrelationship between the main circuits of the tactical repeater.
5-2.1
+15V DC-DC Converter Circuit Card Assembly (CCA) (A1).
The +15V DC-DC converter CCA (A1) provides reg15 VDC to the repeater control CCA (A3) and both hand-
held receiver-transmitters. The DC-DC converter operates from a 10-32 VDC input.
5-2.2
Repeater Control Circuit Card Assembly (CCA) (A3).
The repeater control CCA (A3) combines the signal control and the audio interface between the receive receiver-
transmitter and the transmit receiver-transmitter. The assembly provides reclocking of data when data format is received
by the receive receiver-transmitter. It also automatically identifies whether a 12 kbps or 16 kbps signal is received. This
CCA contains timing circuits to control the push-to-talk (PTT) line of the transmit receiver-transmitter. Timing circuitry
is included to reduce the possibility of missing the initial data bits. Received audio is routed to the microphone line of
the transmit receiver-transmitter and the SQ/CTS, signal present line of the receive receiver-transmitter is converted to
the PTT line of the transmit receiver-transmitter. The repeater control CCA passes both clear and encrypted signals.
5-2.3
Parent Board Circuit Card Assembly (CCA) (A4).
This card provides the interconnection between the other circuit card assemblies and provides power to the receiver-
transmitters.
5-2.4
Control Panel (A5).
The control panel (A5) contains all operator controls and indicators.
5-2.5
RF Power Amplifier Assembly (A6).
The RF power amplifier (A6) amplifies the output of the receiver-transmitter inserted in the XMT sleeve to 2 or 10 watts,
measured at the output of the diplexer, as determined by the setting of the MODE SELECT switch.
The amplifier will function in the entire frequency range of 30-470 MHz, with transceiver operation only in the 30-88,
136-174, and 403-470 MHz frequency bands.
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