E F Johnson Company 2425M70 User Manual

6-10

1 If required, select a channel of a system on which Emergency Calls are enabled and 

press the EMER option switch. The Emergency Call is then sent as described in Section 
6.9.1 if applicable.

2 If the preceding Emergency Hot Mic feature is enabled, the call is automatically 

transmitted without pressing the PTT switch. If it is disabled, press the PTT switch and 
begin speaking as with a standard call. If the channel is changed, operation continues on 
the new channel in the emergency mode.

3 With analog calls, subsequent presses of the PTT switch cause the DTMF emergency 

ID to be sent according to the ANI programming (if DTMF ANI is enabled on the 
channel). With digital calls, the calls continue to have the emergency bit set.

4 If the Surveillance Mode is enabled (see Section 5.10), all indicators, lights, and tones 

are disabled. If “No Receive Activity During Emergency” is programmed, receive 
audio, the front panel LED, and receive icons are disabled in the receive mode.

5 To exit this mode, cycle radio power or press and hold the Emergency switch.

Channel scanning features common to all operating modes are described in Sections 5.12 
and 5.13. The following information describes features unique to conventional operation.

Conventional systems are programmed with a default scan list that is normally selected by 
all channels in that system. However, there is a programmable option to slave a particular 
conventional scan list to a zone. This then becomes the default list for all conventional 
channels in that zone (it overrides the system programming). This slave feature is 
programmed on the Edit Zone screen.

The default scan list (which is to be used by all conventional channels except those 
belonging to slaved zones), can be temporarily changed by using the SCAN option switch 
or menu parameters. A scan list selected in this manner is retained through radio power 
down.

The scan list select procedure is as follows: