GME Electrophone TX4200 Series, Instruction Manual

Page: 19 / 33

and ‘SCAN’ will be displayed.
4. Now activate the QUIET mode by briefly
pressing the Squelch knob.
'QUIET'
will be
displayed indicating the receiver is now
scanning in the QUIET mode.
• If a signal is received on an OPEN channel
but your Selcall Ident is not detected,
scanning will pause while the channel is
busy and will resume 5 seconds after the
channel becomes clear again.
• If a normal signal is received on a QUIET
channel but your Selcall Ident is not
detected, it will be ignored and scanning will
continue.
• If a signal containing your Selcall Ident is
received on any channel - OPEN or QUIET -
both SCAN and QUIET modes will be
de-activated and the receiver will lock onto
that channel. In addition the alarm will beep
to alert you to the call and the callers Ident
will be displayed. The channel will now be
open for normal transmission and reception.
To cancel the alarm, briefly press either the
Squelch knob or the PTT switch. The 'Call
From' Ident will remain on the display so you
will know who called.
To resume scanning in the QUIET mode, press
SCAN, then briefly press the Squelch knob.
'SCAN'
and
'QUIET'
will be displayed.
Important Tips on Scanning in the QUIET
Mode
For your TX4200 to decode a Selcall signal, it
needs to be listening on the channel that the
Selcall is transmitted on. This is normally just a
matter of selecting a specific channel and then
telling others which channel number they should
call you on. However, if your radio is scanning a
number of other channels as well, it may not be
listening on the correct channel at the time the
Selcall transmission starts. This means that by
the time the receiver gets around to scanning
the
correct
channel, some of the Selcall Ident
tones may be missed. If this happens, the
Selcall will not be recognised and you will miss
the call.
The TX4200 gets around this by transmitting a
half second ‘lead-in’ tone at the start of it's
Selcall transmission. This tone delays the
sending of the Selcall Ident to give the receiver
more time to scan the
correct
channel. If the
receiver is able to scan the
correct
channel in
time, it will then be able to successfully detect
the Selcall Ident which follows. It is this feature
which allows you to scan groups of channels
while in the QUIET mode and still receive
Selcalls.
However, despite the fast scanning speed of
the TX4200 (10 channels per second), it can
only scan 5 channels in half a second.
Therefore, for reliable selcall detection when
scanning, it is recommended no more than 5
channels be scanned in any group>
i.e. 5 channels in OS mode
or 2 channels plus the Priority channel in
the GS mode.
GROUP CALLS
The TX4200's Selcall system includes a Group
Call function which allows you to call up to 10
radios simultaneously. This could be useful in
an emergency situation where you may need to
transmit a message to all radios in your group.
The group function works by allowing you to
programme a special group code into the last
digit of the Selcall Ident you are transmitting.
When this group code is received it will
substitute for any other number in the last digit
position. Provided the first 4 digits of the
transmitted Selcall Ident match those of the
in-built receiver Ident, the Selcall alarm will be
activated as if the full 5 digit Ident had been
received.
19
CALL TO
SCAN
MEM
DUP OS/GS
2 3 1
M