TX6600PRO
INSTRUCTION MANUAL
55
TIP:
To ensure reliable SelCall detection when scanning in the Open Scan mode,
it is recommended that you restrict the number of channels in the Scan group to
less than 20.
GROUP CALLING
The SelCall system includes a Group Call function that allows you to call up to 10
radios simultaneously. This can be useful where you need to transmit a message
to several radios in your group. To achieve this, the radios you are calling must
be programmed with SelCall Idents where the first 4 digits are the same on each
radio.
e.g. 12340, 12341, 12342, 12343, --> 12349
The Group Call function works by inserting a special ‘group code’ in the last digit
position of the SelCall Ident you are sending. The ‘group code’ appears as an ‘A’
when displayed in the radio. When the Group Ident is received, the ‘A’ substitutes
for all other numbers in the last digit position, so, if the first 4 digits of the SelCall
match those of the radios you are calling, each radio will respond as if all 5 digits
were received
e.g.
A call to Ident 12341 will normally only activate the alarm in the radio with SelCall
Ident 12341 whereas sending a group call to Ident 1234A will activate all radios
with Idents 12340 through to 12349.
If the radios in your fleet do not have Selcall Idents where the first 4 digits are the
same, you can reprogram them yourself as described earlier in this manual.
Programming and sending Group calls
The process for dialling or saving a Group call Ident is identical to that for a normal
SelCall Ident. Simply select an ‘A’ in the right-hand digit position.
Call acknowledge in Group mode
There is no call acknowledge after sending a group call. This is to prevent all the
radios in your call group from trying to respond at the same time.
Receiving Group calls
Receiving a Group call is identical to receiving a normal SelCall except that the
alarm sound is a double beep instead of the normal single beep. The caller’s Ident
or Alpha Name appears on the display in the usual way.
