Motorola ASTRO APX O5, User Manual

Page: 120 / 166

configuration. The two types are called ruthless and
non-ruthless preemption.
Ruthless
Preemption
When a ruthless preemption
announcement call is initiated, the
requesting radio begins transmitting
immediately. All associated talkgroup
calls taking place on other channels
are immediately halted, and the
radios are steered to the
announcement call.
Transmitting radios continue to
transmit until the
PTT button is
released, at which time they also
unmute for the announcement call.
Individual calls (Private Conversation
and telephone interconnect) are not
affected.
Non-
Ruthless
Preemption
When a non-ruthless preemption
announcement is initiated, the
initiating unit receives a telephone-
type busy tone, followed by a call
back when all associated talkgroup
conversations end.
Once an announcement call is
pending, any attempts by other users
to initiate a talkgroup call will result in
a telephone-type busy tone. These
users will not receive a call back until
the announcement call is complete.
Initiating an Announcement
Ensure your radio has been programmed to allow
announcement calls.
1 Turn the Mode Knob to locate the announcement-
group mode.
2 Press the PTT button to initiate the
announcement.
Ignition Switch Options
This feature allows the user to select the functionality
of the radio based on the Ignition State of the radio
user’s vehicle. The following options are available.
Advanced Features
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