APX 4500 O2 CH
58
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CONTENTS
Emergency Operation
Sending an Emergency Alarm with Emergency Call
ADVANCED FEATURES
This feature allows you to send an Emergency Alarm to
another radio. Upon acknowledgement, both radios can
communicate over a preprogrammed Emergency channel.
If the radio has both emergency call and alarm features
enabled, it automatically proceeds to the call mode after the
alarm is acknowledged.
Procedure:
1
Press the preprogrammed
Emergency
button.
You hear a short medium-pitched tone and the display
shows
Emergency
and the current zone or channel.
OR
You hear a short low-pitched tone to indicate the selected
channel does not support emergency and rejects to launch
emergency mode.
When you receive the dispatcher’s acknowledgment, the
display shows
Ack received
.
You hear four tones, and the radio exits the Emergency
Alarm mode then enters the Emergency Call mode.
2
Press and hold the
PTT
button.
Speak clearly into the microphone.
3
Release the
PTT
button to end the transmission and wait
for a response from the dispatcher.
4
To exit Emergency Call, press and hold the
preprogrammed
Emergency
button for about a second.
Emergency
Button
