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INSTRUCTION MANUAL
TX4400
Note:
You can test this by opening the squelch and
selecting various channels with the channel switch . The
radio will remain quiet on those channels that are set for
Quiet operation while normal channels will emit the usual
background noise .
DE-ACTIVATING THE QUIET MODE
1 . Select any channel that has been tagged for Quiet
operation . ‘Q’ and 'QUIET' will be displayed .
2 . Briefly press the
QUIET
key . 'QUIET' will disappear from
the top of the display and all channels tagged for Quiet
operation will now operate normally again .
RECEIVING SIGNALS IN THE QUIET
MODE
• If a normal signal is received on a QUIET channel, the
channel will appear busy (the 'BUSY' indicator will be
visible) but no sound will be heard from the speaker . This
means you will not be disturbed by the signal .
• If a normal signal is received on an Open channel (one
that is not tagged with ‘Q’) the signal will be heard in
the usual way .
• If a signal containing your Selcall Ident is received on
any channel - Open or QUIET - the QUIET mode will be
cancelled and the alarm will beep to alert you to the
call . In addition, the callers Ident or ALPHA Name will
be displayed . All channels will now be open for normal
transmission and reception .
SCANNING IN THE QUIET MODE
The TX4400 will allow you to scan while the QUIET mode is
active . Using this feature you can monitor a group of Quiet
channels or a combination of Quiet and Open channels .
To Scan in the QUIET Mode:
1 . Briefly press the
OS/GS
key to select the required Scan
group .
2 . Select the channels you wish to scan and store them in
the Scan memory .
3 . From those channels, select the ones you wish to remain
Quiet and tag each one for QUIET operation .
4 . Press the
SCAN
key . The radio will begin scanning and
'SCAN' will be displayed .
5 . Now, briefly press the
QUIET
key to activate the QUIET
Mode . The radio will then be scanning in the
QUIET mode .
RECEIVING SIGNALS WHILE SCANNING
IN THE QUIET MODE
• If a normal signal is received on an open channel,
scanning will pause while the channel is busy and will
resume scanning 5 seconds after the channel becomes
clear . (If you were scanning in Group Scan mode, the
radio may switch between the open channel and the
Priority channel - this is normal) .
• If a normal signal is received on a Quiet channel but your
Selcall Ident is not detected, the signal will be ignored
and scanning will continue .
• If a signal containing your Selcall Ident is received on
any channel - Open or Quiet - both scanning and QUIET
modes will be cancelled and the receiver will stay on
that channel . In addition, the alarm will beep to alert
you to the call and the callers Ident or ALPHA Name will
be displayed . The channel will now be open for normal
transmission and reception .
Note:
To ensure reliable Selcall detection when scanning, it
is recommended that you restrict the number of channels in
the Scan group to 5 or less .
GROUP CALLING
The TX4400's Selcall system includes a Group Call function
which allows you to call up to 10 radios simultaneously .
This can be useful in an emergency situation where you
may need to transmit a message to a number of radios in
your group .
The Group Call function works by allowing you to enter a
special 'group code' into the last digit position of the Selcall
Ident you are sending . The 'group code' appears as an 'A'
when displayed in the radio . When this 'group code' is received,
it substitutes for any other number in the last digit position . As
long as the first 4 digits of the Selcall you are sending match
those of the radios you are calling, their Selcall alarms will be
activated as if their full 5 digit Selcall Idents had been received .
To achieve this, the 10 radios you are calling must be
programmed with sequentially numbered Selcall Idents .
e .g . 12030, 12031, 12032, 10233 . . --> , 12039
• Transmitting the Selcall Ident 12031 will only activate the
alarm in the radio with the Selcall Ident of 12031 .
• Transmitting 1203A will activate the alarms in all radios
with Idents 12030 through 12039 (a total of 10 radios) .
If the radios in your fleet do not have sequentially numbered
Selcall Idents and you want to make use of this function, you
can arrange for your dealer to re-program the Selcall Idents in
your radios .
