Datron PRC1077 - Repeater System Configuration

A: Radio Relay and Repeaters
A-2 PRC1077-MSOP
Repeater Operation
The repeater system extends the range of radio coverage with greater
flexibility than the relay system. In the repeater system, all stations in the
network can communicate with each other using the same semi-duplex
frequencies. The repeater system is limited in that each stations must be in
line-of-sight of the repeater, however, if the repeater transceiver is located on
a mountain top, the range of coverage could be hundreds of square miles.
The repeater system consists of a radio receiver and transmitter operating on
separate frequencies. The audio output from the receiver is connected to the
microphone input of the transmitter. The repeater system can be a receiver and
transmitter specially designed for repeater operation. Two PRC1077s can be
used to create a simple repeater system.
To communicate through a repeater, the transceiver is programmed so the
transmitter frequency is the same as the repeater receiver frequency. The
receiver frequency must be the same as the transmitter frequency. The repeater
will rebroadcast any signal it receives on the transmit frequency to any station
within reception range enabling two-way communications between any two
stations on the network.
The PRC1077 can be programmed with separate transmit and receive
frequencies making it capable of semi-duplex operation through a repeater.
Radio Relay Procedures
For radio relay operation, use the MK-456 Retransmission Cable Kit to
connect to the relay transceiver and follow the same procedures as used with
the PRC77 transceiver. Since the PRC1077 has fewer spurious frequencies
than the PRC77, use the revised procedure to select frequencies.
The two frequencies used in a radio relay system must be separated by at least
5 MHz to eliminate the possibility of mutual interference. It is prudent to
experiment with frequency combinations to make sure the two frequencies do
not cause interference (refer to the Frequency Interference Chart on page
A-4).
The PRC1077 transmitter is compatible with the PRC77, so both types of
transmitters can be used to create a radio relay system.
Dedicated Receiver
A dedicated repeater is a receiver/transmitter combination specifically
designed to be used in a repeater system. The transmitter and receiver are
carefully shielded and can be operated in the same enclosure. Frequently the
repeater uses a duplexer that enables the transmitter and receiver to share the
same antenna.