Funktel TETRA FT4, Руководство по эксплуатации

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Operation

TETRA emergency calls (TMO emergency calls)
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Example: Triggering the alarm with a group call
 All services, e. g. a set-up voice call, are terminated.
 The radio set initiates a group call with an emergency priority.
 The microphone is activated (Hot-Mic), the speakers on the radio sets belonging to
the called group are switched on. A one-way (half-duplex) voice connection is set
up, with an outgoing voice call from the radio set that is transmitting the emer-
gency call and the incoming call being received by the “listening” group. Press the
PTT key briefly to end the Hot Mic mode.
 The emergency call connection appears on the display on a red background.
 The radio set is now in TETRA emergency call mode.
2. Maintain a clear distance between the radio set and your head when listening and
speaking (half-duplex / two-way call).

Press the ‹PTT (transmit key)› (6) and keep it pressed to talk.

To listen, release the ‹PTT (transmit key)› (6) . The one-way voice connection
is ended and the two-way call mode (Direct Through) by means of the PTT key
is active.
The FT4 is shown here
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 
Done.