PA G E 1 0
i n s t r u c t i o n m A n uA l
t X 4 8 0 0
the working channel is normally scanned after every
second Group scan channel (although this can be altered
by the Dealer) .
e .g . using working channel 10 with group scan channels
1, 3, 6, 8, 15 and 26 .
As with the
Open Scan
mode, your radio will display
rapidly changing numbers to indicate the channels
being scanned . in addition the lower section of the lcD
will display
GS
to indicate that it is the
Group Scan
mode, along with the working channel number . if any
channels have alphanumeric labels, the labels will not be
displayed while scanning .
Receiving Signals on the Working Channel
if a signal appears on the working channel while
scanning, the receiver will lock onto the channel and will
remain there for as long as the channel is busy - and for
5 seconds after the transmission ceases . this allows the
tX4800 to hold the channel between short breaks in the
conversation . once the channel has remained clear for 5
seconds, the radio will resume scanning .
if a signal appears on the working channel while the
radio is locked onto a Group scan channel, the receiver
will switch straight to the working channel . the receiver
will now continue to monitor the working channel for
as long as it remains busy . During this time you can
transmit on the working channel in the usual way .
Receiving Signals on a Group Scan Channel
if a signal is received on a Group scan channel, the
receiver will lock onto it and will remain there for as
long as the channel remains busy, and for 5 seconds
after the transmission ceases - As lonG As tHErE ArE
no siGnAls on tHE WorKinG cHAnnEl . During this
time, the receiver will continue to check for signals on
the working channel every couple of seconds resulting in
a series of small breaks in the reception of the "locked"
channel . if no signals are heard on the "locked" channel
after 5 seconds, the radio will resume normal scanning .
to stay on a busy Group scan channel, briefly press the
Scan
key . the radio will exit the scan mode and stay on
the busy channel . You can now transmit normally on
that channel .
NOTE:
At this point the radio will no longer be
monitoring the working channel .
to resume Group scan briefly press the
Scan
key again .
OVERVIEW
if selcall has been enabled on the radio, it will have been
preprogrammed with its own unique identifying code .
the radio may also allow you to transmit these selcall
codes, allowing you to call others who are also using the
selcall system .
'selective calling' is a secure signalling system that
allows individual radios to be selectively called without
disturbing other radio's sharing the same channel . Each
radio can be preprogrammed with a unique code (called
a selcall ident) . the radio can then be set to remain
totally quiet while it monitors the channel for selcall
signals . Any incoming selcall code is compared with its
own code . if the two codes match, it knows it is being
called and sounds an alarm to alert you . it also displays
the caller's unique code or an alphanumeric label
identifying the caller to you . in this way, even if you are
away from your radio when the call is received, you will
still know that you were called . You can then return the
call at your convenience . if further calls are received, the
most recent caller is displayed .
A special group code may also be available to you which
will allow specific groups of radios to be selectively called
without disturbing other individuals or groups .
OPERATING IN THE QUIET MODE
the QuiEt mode prevents any incoming transmissions
from being heard in the tX4800’s speaker until your
selcall ident is received . this allows you to monitor
a busy channel for calls without being disturbed by
unwanted signals .
When the selcall ident is received, the QuiEt mode is
cancelled and all incoming signals will be heard in
the speaker .
if your radio is programmed with a
Quiet
key, you will
be able to manually set your receiver's selcall 'Quiet'
muting system . if not, the radios quiet muting system will
have been preset for you by the Dealer .
The QUIET Key
if fitted, the
Quiet
key can be used with selcall to
enable or disable quiet operation .
•
When Quiet is enabled, you will not hear any signals
on the channel until someone specifically calls you
using selcall .
•
When Quiet is disabled, you will be able to hear all
transmissions on the channel .
SELECTIVE CALLING
