PA G E 4
i n s t r u c t i o n m A n uA l
t X 3 4 4 0
Function KEys
there are four keys beneath the tX3440’s display that
have both primary and secondary functions. their primary
functions are printed in Black while their secondary
functions are printed in red.
to access the primary functions
simply press the required key. e.g. to control the squelch,
briefly press the
sQl
key.
to access the secondary functions
Press the red
F
key followed immediately by the required
red coloured key.
note:
if the secondary key is not pressed within 10
seconds the
F
key selection will be cancelled.
VolumE KEy
Press the
+
to increase the volume and press the
–
to
decrease the volume.
note:
At minimum volume setting there is still sufficient
volume to be heard in a quiet cabin environment.
KEylocK FEaturE
the
key locks the keys on the microphone to prevent
unintentional key presses from altering your tX3440
settings. While the keys are locked, only the Ptt (Push-
to-talk), sql key, on/off, Volume keys, the F key 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
Press the or keys to step upwards or step downwards
one or more channels.
transmitting
to transmit, press the
ptt
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 tX3440 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 below.
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 tX3440 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 17.
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.
. Press and
hold
the
pri
key until a high beep is heard.
the selected channel will be stored.
