PA G E 6
i n s t r u c t i o n m A n uA l
t X 3 3 4 0
squelCh Control
squelch control is used to eliminate the background noise
when there are no signals present. the tX3340 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 tX3340 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.
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 that which it receives allowing operation through
repeater stations. repeaters automatically re-transmit your
signal over a wider area, providing greatly increased range.
duplex operation operates only on channels 1-8 and 41-48.
When duplex is selected on these channels, the radio receives
on that channel but actually transmits 30 channels higher.
e.g.
Vehicle
Simplex/Duplex Range Comparison
simplex
repeater
operation
channel 31
channel 1
repeater
station
channel 1
channel 31
Vehicle
