Basic Operation 15
your radio only unmutes if the call carries the sub-
audible tone or code specific to your fleet or group.
Selective Call Mute
2-tone decoding and 5-tone signaling use audible
tones to isolate your calls, so that your radio only
unmutes if the call carries the tones specific to your
fleet or group.
RF Squelch
The radio’s RF squelch allows reception of a signal
only when it is above a factory-set threshold, so that
only intelligible signals are made audible. Your radio
can be programmed to override RF squelch using
the monitor key ( ), allowing all activity on a
channel to be heard, including noise.
Activating squelch override allows you to hear weak
but intelligible transmissions.
Monitor
The monitor key ( ) can be programmed to
override one or more of the muting controls. In the
most common configuration, monitor operates in
the following way:
1. Press the monitor key briefly (less than one
second) to override CTCSS/DCS or selective
call mute, or both. Press the monitor key again
to reactivate CTCSS/DCS or selective call mute.
Note: If hookswitch monitoring is pro-
grammed, lifting the microphone off the
microphone clip has the same effect.
2. Press and hold the monitor key for longer than
one second to activate RF squelch override.
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