User guide

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.
N
ormally, 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
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