GME TX3120S User Manual
Page 16
PA G E 1 6 I N S T R U C T I O N M A N UA L
T X 3 1 2 0 S
DISABLING THE INTERNAL SPEAKER
The TX3120S has two speakers – one mounted
inside the radio and the other mounted inside the
microphone. By default, sound is reproduced by
both speakers; however if you prefer, the radio’s
internal speaker can be switched off leaving just
the speaker/microphone to reproduce sound.
To switch off the radio’s internal speaker
1. Press and hold the Channel control to enter the
menu. The display will show the current Squelch
level setting.
2. Rotate the Channel control until ‘SPKxx’ is
displayed (where xx = ON or OF), then press
the Channel control to select it. ‘ON’ or ‘OF’
will be flashing.
3. Rotate the Channel control to the right to
switch the internal speaker ON. ‘SPKON’
will be displayed.
4. Rotate the Channel control to the left to
switch the internal speaker OFF. ‘SPKOF’
will be displayed.
When finished briefly press the Channel control
to return to the menu or press and hold the
Channel control to exit the menu.
REPEATERS AND DUPLEX
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 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 has a Duplex function 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.
CHANNEL 31
CH
ANNEL 1
CHANNEL 1
CHANNEL 31
VEHICLE
SIMPLEX
REPEATER
OPERATION
VEHICLE
REPEATER
STATION