MDC Over-the-Air Rekeying Page
(Conventional Only)
This feature allows you to view or define MDC Over-the-Air
Rekeying (OTAR) features. It is applied only when
operating in secure encrypted mode. In addition to Rekey
Requests, OTAR transmissions include Delayed
Acknowledgments, and Power-up Acknowledgments.
Some of the selected options require configuration at the
Key Management Controller (KMC) site to work properly.
NOTICE:
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 the
encryption keys are erased. Without this UKEK key, the
radio cannot be rekeyed over the air.
NOTICE:
This feature must be preprogrammed by a qualified
radio technician. Check with your dealer or system
administrator for more information.
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.
English
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