PAGE 14 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.
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