P25 Mutual Aid squelch modes
In P25 Mutual Aid mode, you can select a squelch mode to restrict incoming
calls against certain conditions based on their Network Access Code (NAC)
and Talk Group Identity (TGID).
Note:
The radio resets to the default (Normal) squelch mode whenever
you select P25 Mutual Aid mode.
To change P25 Mutual Aid squelch
1. In the Home screen press
Squelch
.
The following squelch modes are provided:
Normal
(default)— routine group voice calls are received only if the
Network Access Code (NAC) in the received signalling is compatible
with the NAC configured for the selected channel. The Talk Group
Identity (TGID) is ignored, hence this is the standard squelch mode for
receiving Unaddressed Group Voice Calls on Mutual Aid channels.
Selective
—routine group voice calls are received only if the NAC in the
received signalling is compatible with the Rx NAC configured for the
selected channel, AND the TGID in the received signalling either
matches the TGID configured for the selected channel or is equal to the
All Call talk group, AND the Group Address in the received signalling
either matches the TGID configured for the selected channel or is equal
to the All Call talk group.
Monitor
—routine group voice calls are received regardless of NAC and
TGID.
2. Scroll to a squelch mode in the list, then press
Select
.
A large ‘check’ icon appears to confirm the change.
Making and receiving calls in P25 Mutual Aid mode
When your radio is in P25 Mutual Aid mode but is not involved in a received
or transmitted call, its radio status is shown on the Home screen as
Idle
.
Whenever your radio is idle it continually monitors the selected channel to
determine whether the channel is free or busy, and the
Signal Strength
icon indicates the activity on the selected channel (so that you can judge
when the channel appears to be free).
108
HTT-500-2 – 12/2016