Motorola APX 2000 User Manual page 129

Delayed Acknowledgements, and Powerup
Acknowledgements.
Some of the options selected may also need to be set
up at the Key Management Controller (KMC) site to
work properly.
Note: This feature must be preprogrammed by a
qualified radio technician. Check with your dealer or
system administrator for more information.
Infinite UKEK Retention
This feature enables Unique Key Encryption Key
(UKEK) to be permanently stored in the radio even
when all of the encryption keys is erased. Without this
UKEK key, the radio could not be over the air
rekeyed.
Note: This feature must be preprogrammed by a
qualified radio technician. Check with your dealer or
system administrator for more information.
Hear Clear
Note: 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, e.g.
OTA transmission, that is
predominantly present in UHF2 and
900 MHz channel with the following
features.
Compressor Reduces the
Expander
Random FM
Reduces the unwanted effects of
Noise
random FM noise pulses caused by
Canceller
channel fading under high Signal-to-
(Flutter
Noise (S/N) conditions such as in a
Fighter)
moving in a transportation. The
fading effects, heard as audio pops
and clicks, are cancelled without
affecting the desired audio signal.
background noise
flow and the speech
signal at transmitting
radio.
Expands the speech
while the noise flow
remains the same at
receiving radio.
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English