Motorola GM 340 - Manual (Page 26)

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COMPANDING
Companding is a collective term to define
compressing the audio signal on transmission
and expanding the audio signal on reception.
The overall effect is to reduce noise in the
received signal, giving you crisper, clearer
audio clarity. Companding should only be used
when other radios in your system have the
same companding feature available.
You can switch On or Off Companding by
using a pre-programmed Companding button
or via the menu.
To enable Companding
1. Press the Companding button to switch
Companding on, when the feature enable
alert will sound and the associated LED
will light.
To disable Companding
1. Press the Companding button again to
switch Companding off, when the feature
disable alert will sound and the
associated LED will be extinguished.