4
APCO P25 MODE OPERATION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
54
n
Emergency transmission
The P25 emergency mode can be accessed by pushing the
[Emergency] key.
An Emergency alarm is automatically transmitted once or
repeatedly, depending on the presetting, to the dispatcher
(Trunking mode) or Talkgroup (Conventional mode).
Moreover, while in the emergency mode, Emergency calls
can be transmitted with
[PTT] to a Talkgroup.
If your transceiver is programmed for Silent operation, you
can transmit Emergency alarms and Emergency calls without
the beep sounding or the LCD display lighting.
[Emergency] key assignment is necessary to transmit the
Emergency alarm.
NOTES:
• When the Auto TX function is preset, the transceiver au-
tomatically transmits the microphone audio for the preset
time period after the emergency alarm transmission, even
if the emergency repeat cycle is set to ‘1.’
- The HM-148G or HM-152
hand
microphone
is required for the
mobile transceivers.
• When the Auto RX function is preset, the transceiver
stands-by in the audible mode, for the preset time period,
after the emergency alarm transmission.
D
Transmitting an Emergency alarm
q
Hold down
[Emergency] for the preset time period to
enter the emergency mode.
• The countdown starts immediately.
w
After the preset time period has passed, the transceiver
automatically transmits an Emergency alarm once or re-
peatedly, depending on the presetting, to inform the dis-
patcher that the transceiver is in the emergency condition.
• To exit the emergency mode, hold down
[Emergency] before
transmitting an Emergency alarm.
• When the emergency repeat cycle is set to ‘1,’ the transceiver
transmits an Emergency alarm, exits the emergency mode and
returns to normal operation.
• After receiving an acknowledgement, “
ACK RECEIVED” is dis-
played (Simple and 10-key types only), and depending on the
presetting, the transceiver exits the emergency mode.
• When an acknowledgement is not received, “
NO ACKNOWLDG”
is displayed. (Simple and 10-key types only) And depending on
the presetting, the transceiver automatically transmits the micro-
phone audio (Auto TX).
e
To exit the emergency mode, turn the power OFF.
• With transceivers whose revision number is 1.7 or later, pushing
[Home] also cancels the emergency mode.