Basic operation 17
English
Transmit timer
Your radio may have a transmit timer that limits the amount
of time you can transmit continuously. When the transmit
timer is about to expire, the red LED flashes and the radio
gives three beeps. You must release the PTT before you can
transmit again.
Note: Your radio may be unable to transmit for a short time
after the transmit timer has expired.
Receiving a call
When there is valid activity on your radio’s currently selected
channel or group, the radio then unmutes and you can
hear the call.
If the incoming call contains special signalling that matches
the signalling programmed for your radio, the green LED
flashes and your radio may give a ringing tone.
What you hear on a channel
Your radio may be programmed so that you hear all conversa-
tions on a channel, or your user group may be segregated from
other user groups by using special signalling. The special
signalling is used to control the muting and unmuting of your
radio, so that your radio is muted when other user groups are
talking and unmuted for members of your user group.
There are two muting controls that operate in your radio:
■ signalling mute, and
■ squelch.
Signalling mute
The radio’s signalling mute only allows the radio to unmute if
the incoming call carries the tones specific to your user
group. Your user group may use tones that are either audible,
subaudible or both.
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