User's Guide

Making an Alarm call
You can still make an Alarm call if the keypad is locked.
To make an Alarm call
1. Press and hold (2 seconds) the Emergency button; a confirmation beep sounds.
2. Release the button and speak into the microphone.
During an Alarm call:
the microphone is ‘live’ for a programmed period (seconds) allowing you to speak hands-free
without pressing the PTT button (customisable)
the LED illuminates solid red
your radio sounds audible tones
a large emergency symbol appears on the screen
your identity and talkgroup appears on the display of those receiving the Alarm call
Receiving an Alarm call
An Alarm call overrides any existing calls on the talkgroup.
You know you are receiving an Alarm call when:
your radio sounds an audible tone
the LED flashes red
the emergency symbol appears on the screen
your radio status changes to Emergency
Clearing an Alarm call
You can only clear an Alarm call that you have initiated.
To cancel the Alarm call, press the Clear context key.
To cancel the Alarm call, press the Call Clear key, the Clear context key or the Cancel/Home key.
Alternatively, your radio may be customised to use the Emergency button to cancel the Alarm call.
Depending on which network is being used, if the TETRA Alarm call is a group call, then—although
both of the TETRA Alarm call exit functions will clear the TETRA Alarm call on the call originator’s
radio—it will not remove the alarm from the system. Radios alerted to the emergency may,
depending upon the infrastructure configuration, remain in the TETRA Alarm call condition until the
dispatcher clears the call from the system.
When the Alarm call is cancelled, your radio returns to the talkgroup that was selected before the call
was initiated.
26 SC21 Series hand-portable radio