t X 3 4 4 0
i n s t r u c t i o n m A n uA l
PA G E 5
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 tX3440 allows you to pre-select Duplex operation
individually on each channel.
to select Duplex on individual channels
1. select the required channel 1-8
. Briefly press the
F
key then press the
Dup
key. ‘DuP’
will appear on the display accompanied by a high beep.
to remove Duplex from a channel
1. select the required channel 1-8. ‘DuP’ will be visible
on the display.
. Briefly press the
F
key then press the
Dup
key.
‘DuP’ will disappear from the display accompanied
by a low beep.
ctcss
ctcss (continuous tone coded squelch system) is a
squelch quieting system that allows several groups of users
to share the same channel without disturbing each other.
it uses a preset sub-audible (very low frequency) tone to
open and close the squelch on your radio. there are up to
50 tones available in two optional tone sets. the system
applies a continuous low-level tone to your transmission
and uses a matching tone decoder to control your receiver’s
squelch. With ctcss enabled, the channel remains quiet
to all incoming signals unless they carry the correct tone.
When a transmission with the correct tone is received, the
squelch opens and remains open for as long as the signal is
present. When the transmission ends, the channel becomes
quiet again. transmissions that do not use the correct tone
will not be heard.
the tX3440 allows ctcss to be enabled or disabled on
individual channels.
note:
the ctcss tone you select will be used for all ctcss
enabled channels in your radio.
monitoring thE channEl
it is useful to be able to temporarily open your radio’s
squelch to allow you to listen for signals from other ctcss
users outside your group. Because their ctcss tone is
different to yours, your squelch would normally remain
closed, preventing you from hearing them. You can use
the
sQl
key to open the squelch and listen to the channel
to check that it is clear before transmitting. this will help
prevent you from accidentally transmitting over the top
of another transmission.
to monitor the channel
Press the
sQl
key. if there are no signals present, you will
hear the usual hiss of an empty channel. Press the
sQl
key
again to restore the squelch to its previous setting.
sElEcting thE tonE sEt
there are two standard tones sets available, one comprising
50 tones and the other comprising 38 tones. Both tone sets
are included in the tX3440 to provide compatibility with
other GmE radio systems.
sElEcting thE rEQuirED ctcss tonE
to pre-select the ctcss tone on your radio, please refer to
the
mEnu
sEttings
on page 16.
EnaBling ctcss on a channEl
if a ctcss tone has been selected, it can be enabled on
individual channels.
1. Press the or keys to select the required channel.
. Press and
hold
the
sQl
key. A high beep will be heard
and ‘silEnt’ will appear on the display.
You may activate ctcss on as many channels as you wish
except channel 5 which is designated for emergency use.
DisaBling ctcss on a channEl
repeat steps 1 and above. A low beep will be heard and
‘silEnt’ will disappear from the diplay.
note:
You will not be able to activate ctcss if the ctcss
tone is set to ‘oF’.
Please see the
ctcss tone Frequency chart
on page 1
channel selected
1
3
4
5*
6
7
8
receive channel
1
3
4
5*
6
7
8
transmit channel
31
3
33
34
35*
36
37
38
