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 key
until a high beep is heard. The ‘ ’ symbol will appear
on the display.
To unlock the keys
Briefly press the F key, then press and hold the key
until a low beep is heard. The ‘ ’ symbol will disappear
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.
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.
* 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.
Channel Selected 1 2 3 4 5* 6 7 8
Receive Channel 1 2 3 4 5* 6 7 8
Transmit Channel 31 32 33 34 35* 36 37 38
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