GME GA9800 Instruction Manual page 147

REPEATERS
A repeater system consists of a linked transmitter/receiver
combination installed in a prominent location. The repeater
is designed to receive signals on a designated channel and
re-transmit them on another channel.
Repeaters are usually located on hills, mountains or tall
buildings. The increased elevation greatly improves the
range of the repeater beyond that of a normal base or
mobile. This means that the repeaters are able to receive
and retransmit signals to radios that would otherwise be out
of range of each other.
normally, uhf radios transmit and receive on the same
channel. This is known as SIMPLEX operation. however, to
communicate through repeaters, your radio must be able
to transmit and receive on different channels (known as
DuPLEX). your TX3220 has a Duplex key to allow you to
operate through repeaters.
Channel Frequency
01 476.425
02 476.450
03 476.475
04 476.500
05 476.525
06 476.550
07 476.575
08 476.600
09 476.625
10 476.650
11 476.675
12 476.700
13 476.725
14 476.750
15 476.775
16 476.800
17 476.825
18 476.850
19 476.875
20 476.900
* Emergency Calling for both Simplex and Duplex operation
# Reccomme nded channel for general calling.
+ Highway information (truckies) channel.
PagE 10
UhF ChANNELS AND FREQUENCIES
Usage
Repeater (1) RX
Repeater (2) RX
Repeater (3) RX
Repeater (4) RX
* Emergency Call (5) RX
Repeater (6) RX
Repeater (7) RX
Repeater (8) RX
Simplex
Simplex
# General Calling
Simplex
Simplex
Simplex
Simplex
Simplex
Simplex
Simplex
Simplex
Simplex
InSTRuCTIon ManuaL
The Duplex function only operates on channels 1-8, as these
are the channels that have been designated for repeater use.
When Duplex mode is selected, your TX3220 receives on the
selected channel (e.g. channel 1) but automatically transmits
30 channels higher (i.e. channel 31). The UHF repeater
receives your signal on Channel 31 and retransmits it on
channel 1 for others to hear.
Simplex/Duplex Range Comparison
Simplex
Repeater
operation
Vechicle
Channel Frequency
21 476.925
22 476.950
23 476.975
24 477.000
25 477.025
26 477.050
27 477.075
28 477.100
29 477.125
30 477.150
31 477.175
32 477.200
33 477.225
34 477.250
35 477.275
36 477.300
37 477.325
38 477.350
39 477.375
40 477.400
Repeater
Station
Vechicle
Usage
Simplex
Telemetry Use (RX) Only
Telemetry Use (RX) Only
Simplex
Simplex
Simplex
Simplex
Simplex
Simplex
Simplex
Repeater (1) TX
Repeater (2) TX
Repeater (3) TX
Repeater (4) TX
* Repeater (5) TX
Repeater (6) TX
Repeater (7) TX
Repeater (8) TX
Simplex
+ Road Channel
TX 3220