Repeater And Duplex Mode - GME XRS-330C Instruction Manual

Repeater and Duplex Mode

Duplex operation allows the radio to transmit on a different frequency to that which it receives. This
allows operation through repeater stations.
A repeater station consists of a linked transmitter/receiver combination installed in a prominent
location. The repeater is designed to receive signals on a designated channel and retransmit them
on another channel. Repeaters are usually mounted on hills or tall buildings. The increase elevation
greatly improves both the receiving and transmitting range of the repeater allowing it to receive and
retransmit signals to radios that would otherwise be out of range of each other.
Normally, UHF CB radios transmit and receive on the same frequency - known as Simplex operation.
However, to communicate through repeaters, your radio must be able to transmit and receive on
different channels - otherwise known as Duplex operation. Your radio is fitted with a Duplex key to
allow you to operate through repeaters.
The Duplex function can only be selected on channels 1 - 8 and 41 - 48 as these are the channels
that have been allocated for repeater use. When Duplex is selected, your radio receives on the
selected channel (e.g. CH 1) but transmits 30 channels higher (CH 31). The repeater hears your signal
on CH 31 and retransmits it on CH 1 for others to hear.
Your XRS Connect radio allows you to enable or disable Duplex mode on individual repeater
channels. In this way any repeater channels that are not being used with repeaters in your area can
be used in Simplex mode for normal direct radio-to-radio communications.
To enable duplex on a repeater channel:
1. Select the required repeater channel (1 - 8, 41 - 48).
2. Briefly press the DUP key. The
beep.
To remove duplex from a repeater channel:
1. Select the required repeater channel (1 - 8, 41 - 48). If duplex is currently selected, the
icon will be displayed.
2. Briefly press the DUP key. The
low beep.
Channels 1 - 8, 31 - 38, 41 - 48 and 71 - 78 should only be used in Simplex mode if there are
no repeaters in or near your location that operate on the selected channel. In particular, avoid
operating in Simplex mode on any of the repeater input channels 31 - 38 and 71 - 78 unless
you are absolutely sure that there are no repeaters in range using that channel. Inadvertently
transmitting on an active repeater input frequency in simplex mode could cause interference to
other users on that repeater who might not be audible to your radio.
May 2019
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XRS-330C Instruction Manual
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