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settings . While the keys are locked, only the Push-to-talk
(Ptt), on/off Volume control and the Keylock key will
continue to function .
to lock the keys
Briefly press the F key, then press and hold the
until a high beep is heard . the '
on the display .
to unlock the keys
Briefly press the F key, then press and hold the
until a low beep is heard . the '
from the display .
sElEcting channEls
rotate the channel knob to step upwards or step
downwards one or more channels .
transmitting
to transmit, press the Ptt (Push-to-talk) button on the
microphone . hold the microphone about 5-8 cm from your
face and speak at a normal voice level . the microphone is
quite sensitive so it is not necessary to raise your voice or
shout . release the Ptt when you have finished talking .
sQuElch control
squelch control is used to eliminate the background noise
when there are no signals present . the tX3420 features
a preset squelch system . the squelch sensitivity has been
factory set to provide optimum performance in most
environments, however the sensitivity can be altered by the
user if required, to suit varying environmental situations .
the squelch can be opened or closed with the sQl key .
When the squelch is open, the receiver's background noise
can be heard and 'Busy' is displayed . When the squelch is
closed, the receiver remains quiet when there are no signals
present but an incoming signal will override the squelch
and be heard in the speaker .
to open the squelch
Briefly press the sQl key . A low beep will be heard . if
there are no signals present you will hear the receiver's
background noise .
to close the squelch
Briefly press the sQl key again . A high beep will be heard
and the receiver will become quiet .
note: if an incoming signal is very weak and is close to the
minimum squelch level, it may become broken or 'chopped'
by the squelch action . to prevent this, simply open the squelch
to allow the signal to be heard clearly . Alternatively you can
reduce the squelch sensitivity as described as follows .
PA G E 4
key
' symbol will appear
key
' symbol will disappear
i n s t r u c t i o n m A n u A l
sQuElch sEnsitiVity
the sensitivity of the squelch to incoming signals can
be set to suit your operating environment . For example,
excessively noisy environments may cause the squelch
to open on local noise . the tX3420 has nine (9) preset
squelch sensitivity settings that can be selected using the
mEnu function .
to adjust the pre-set squelch sensitivity
Please refer to the mEnu sEttings on page 16 .
Priority channEl
the Priority channel feature allows you to store one of
the channels as a Priority channel that can be instantly
recalled at the press of a key . this can be used to provide
instant access to your working channel or your local
repeater channel .
to store a Priority channel
1 . select the required channel .
2 . Press and hold the Pri key until a high beep is heard .
the selected channel will be stored .
to recall a Priority channel
Briefly press the Pri key . the radio will switch straight to
the selected Priority channel . Any active functions (such
as scanning or quiet) will be cancelled .
DuPlEx oPEration
duplex operation allows the radio to transmit on a different
frequency to which it receives . this allows operation
through local repeater stations . these repeater stations
automatically re-transmit your signal over a wider area,
providing greatly increased range .
duplex operation is only available on channels 1-8 . When
duplex is selected on these channels, the radio receives on
that channel but actually transmits 30 channels higher .
e .g .
channel selected
1
receive channel
1
transmit channel
31
* Emergency channel only
the tX3420 allows you to pre-select duplex operation
individually on each channel .
to select Duplex on individual channels
1 . select the required channel 1-8
2 . Briefly press the F key followed by the DuP key . 'duP'
will appear on the display accompanied by a high beep .
2
3
4
5*
6
2
3
4
5*
6
32
33
34
35*
36
7
8
7
8
37
38
t X 3 4 2 0
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