E F Johnson Company 2425341 Benutzerhandbuch

27

turns off. The PTT switch must then be released 
until the penalty timer expires (indicated by a beep).

Normally, all transmissions go through a repeater 

which usually increases range. However, there may be 
times when a mobile is out of range of the repeater and 
therefore unable to talk to anyone even though the 
mobile being called is only a short distance away. To 
allow communication in this situation, repeater talk-
around can be selected. Transmissions then occur on 
the receive frequency which permits direct mobile-to-
mobile communication.

Repeater talk-around can be selected if the RTA 

option switch is programmed. When talk-around is 
enabled by this switch, “RTA ON” is flashed in the 
display, and when it is disabled, “RTA OFF” is 
flashed. This feature remains enabled during scanning, 
and changing channels or turning power off does not 
change the selected condition. Talk-around is available 
on conventional channels only.

If the DISP option switch is programmed, it can 

be used to display the channel frequency in megahertz. 
Pressing this switch toggles between displaying the 
standard channel alias and the frequency. The receive 
frequency is displayed while receiving and the transmit 
frequency is displayed while transmitting. This feature 
is available on conventional channels only.

5.10.1  INTRODUCTION

Emergency Alarms and Calls are separate func-

tions that can be individually enabled or disabled on 
each analog and P25 conventional system. The Emer-

gency option switch is required for these functions. 
Emergency Alarms and Calls are transmitted on the 
global (radio wide) emergency zone/channel if one is 
programmed. If it is not programmed, the emergency 
is transmitted on the selected channel. The emergency 
programming of the system to which that channel is 
linked controls the emergency operation.

5.10.2  EMERGENCY ALARMS

An emergency alarm is a special transmission that 

alerts a dispatcher of an emergency situation. It is sent 
automatically by simply pressing Emergency option 
switch. The system to which the emergency channel is 
linked must have Emergency Alarms enabled. If not, 
Emergency Alarms are disabled. 

In the P25 conventional mode, a special P25 

emergency data transmission is sent, and in the 
conventional analog mode, an DTMF emergency ID is 
sent. This ID is programmed on the Conventional 
Radio Wide screen. 

Proceed as follows to send an emergency alarm: 

1. If required, select a channel of a system on which 

Emergency Alarms are enabled and then press the 
EMER option switch. The radio then automatically 
transmits the emergency alarm.

2. Either Normal or Silent operation can be 

programmed. With the Normal mode, the red LED 
lights, the emergency tone sounds, and 
“EMERGNCY” flashes in the display. This indica-
tion continues to flash until the alarm mode is ended 
(see step 4). If silent programmed or the Surveil-
lance mode is selected (see Section 4.9), none of 
these indications occur. 

3. When the emergency alarm is acknowledged by the 

dispatcher, “ACK RCVD” is briefly displayed and 
the emergency acknowledge tone (two beeps) 
sounds. This alert tone can be disabled if desired, 
and neither occur if Silent operation is programmed. 

4. The emergency alarm mode is exited when radio 

power is cycled, the channel is changed, or by 
pressing and holding* the Emergency option switch. 

* This feature requires firmware 1.24.1/2.2.1/3.2.1 or 
later and PCConfigure 1.22.0 or later.