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retransmit them on another channel. Repeaters are usually
mounted on hills or tall buildings. The increased 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 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 TX3500S 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
TX3500S 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.
The TX3500S 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.
T X 3 5 0 0 S
To enable Duplex on a repeater channel
1. Select the required repeater channel (1–8, 41–48)
2. Briefly press the DUP key. The duplex symbol
appear on the display accompanied by a high beep.
To remove Duplex from a repeater channel
1. Select the required repeater channel (1-8, 41-48). If
duplex is currently selected, the
will appear.
2. Briefly press the DUP key. The duplex symbol
disappear from the display accompanied by a low beep.
Channel
Selected
1
2
3
4
5*
6
7
8
41
42
43
44
45
46
47
48
* Emergency channel only
I N S T R U C T I O N M A N U A L
duplex symbol
Receive
Transmit
Channel
Channel
1
31
2
32
3
33
4
34
5*
35*
6
36
7
37
8
38
41
71
42
72
43
73
44
74
45
75
46
76
47
77
48
78
will
will
PA G E 9
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