UhF ChANNELS AND FREQUENCIES
Channel
Frequency
Usage
Channel
Frequency
Usage
01
476.425
Repeater
(1) RX
21
476.925
Simplex
02
476.450
Repeater
(2) RX
22
476.950
Telemetry Use (RX) Only
03
476.475
Repeater
(3) RX
23
476.975
Telemetry Use (RX) Only
04
476.500
Repeater
(4) RX
24
477.000
Simplex
05
476.525
* Emergency Call
(5) RX
25
477.025
Simplex
06
476.550
Repeater
(6) RX
26
477.050
Simplex
07
476.575
Repeater
(7) RX
27
477.075
Simplex
08
476.600
Repeater
(8) RX
28
477.100
Simplex
09
476.625
Simplex
29
477.125
Simplex
10
476.650
Simplex
30
477.150
Simplex
11
476.675
# General Calling
31
477.175
Repeater
(1) TX
12
476.700
Simplex
32
477.200
Repeater
(2) TX
13
476.725
Simplex
33
477.225
Repeater
(3) TX
14
476.750
Simplex
34
477.250
Repeater
(4) TX
15
476.775
Simplex
35
477.275
* Repeater
(5) TX
16
476.800
Simplex
36
477.300
Repeater
(6) TX
17
476.825
Simplex
37
477.325
Repeater
(7) TX
18
476.850
Simplex
38
477.350
Repeater
(8) TX
19
476.875
Simplex
39
477.375
Simplex
20
476.900
Simplex
40
477.400
+ Road Channel
* Emergency Calling for both Simplex and Duplex operation
# Reccomme nded channel for general calling.
+ Highway information (truckies) channel.
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.
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
Vechicle
Channel 31
Channel 1
Channel 1
Channel 31
Repeater
Station
PagE 10
InSTRuCTIon ManuaL
TX3220
