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Group Calling
Most Selcall users will have several members in their group. It is possible that everyone
in the group needs to be alerted at the same time, for example when an emergency
situation occurs. Calling them one by one can be inconvenient and time consuming. It
is possible to create a special code that will be recognized by every radio in the group
when transmitted. Your UH-100 incorporates this feature known as Group Calling.
The UH-100 has the capability of being owner programmed to Group Call within groups
of 2 to 10,11 to 100,101 to 1000 or 1001 to 10000 radios.
While you were setting SelcalllO numbers to be sent, you may have noticed the letter
"A" appeared on the LCO from time to time. This letter has a special application. When
added in your code to be transmitted, it tells the UH-100 that the call is a Group Call in
nature. Note that you have to follow a special format to make a Group Call.
To make a Group Call work all members of the group must have Selcall ID's in a
numerical sequence. e.g. group of 10 users may have the following SelcalllO's:
23450
23451
23452
23453
23454
23455
23456
23457
23458
23459
To be able to Group Call all the other 9 radios in your group of
10 you would need to transmit the code 2345A.
f13 GAL
SRF 1
~:JI{SR
'-' ,-,
IL'
ALL radios with 2345 as the first 4 numbers of their ID Code will be alerted.
Using the first four digits followed by "A" is suitable for calling groups of 2 to 10 radios
as shown above.
The first 3 digits followed by "AA" is for 11 to 100 radios. (eg 234AA)
The first 2 digits followed by "AAA" is for 101 to 1000 radios. (eg 23AAA)
The first digit followed by "A" is for 101 to 10000 radios. (eg 2AAAA)
You can still call any of the individual members of your group, without calling all the
others, by programming the individual's SelcalllO into a separate memory location.
e.g. You have your group call code (2345A) in memory location 5. You want to be able
to call unit 23453 outside the group so you store 23453 in memory location 3.
The UH-100 differentiates group calls and individual calls by emitting different alarm
beeps.
For Group Calls the alarm beepwill be a Iow tone and for individual tone calls the beep
will be a high tone.
Note: When you transmit a Group Call you will not receive acknowledgment tones
from the other radios as you nonnally do with individual tone calls.
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