Motorola APX 4000Li, Руководство пользователя, Страница: 70 / 102

Hear Clear
NOTICE:
This feature must be preprogrammed by a qualified
radio technician. Check with your dealer or system
administrator for more information.
There are two components of Hear Clear.
Companding
Reduces the channel noise, such as OTA transmission
that is predominantly present in UHF2 and 900 MHz
channel with the following features.
Compressor
Reduces the background noise flow and the speech
signal at transmitting radio.
Expander
Expands the speech while the noise flow remains the
same at receiving radio.
Random FM Noise Canceller (Flutter Fighter)
Reduces the unwanted effects of random FM noise
pulses caused by channel fading under high Signal-to-
Noise (S/N) conditions such as in a moving
transportation. The fading effects, heard as audio pops
and clicks, are canceled without affecting the desired
audio signal.
The Random FM Noise Canceller operates only in
receive mode.
Trunking System Controls
This chapters explains the trunking system control features
in your radio.
Operating in Failsoft System
The failsoft system ensures continuous radio
communication during a trunked system failure. If a
trunking system fails completely, the radio goes into failsoft
operation and automatically switches to its failsoft channel.
During failsoft operation, your radio transmits and receives
in conventional operation on a predetermined frequency.
You hear a medium-pitched tone and the display shows
Failsoft .
When the trunking system returns to normal operation, your
radio automatically leaves failsoft operation and returns to
trunked operation.
English
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