Motorola APX 7000 User Manual page 67

If the rekey operation fails, a bad-key tone sounds
and the display shows RKY FAIL.
Note: The rekey operation failure indicates that
your radio does not contain the Unique Shadow
Key (USK).
MDC Over-the-Air Rekeying (OTAR) Page
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 and only
for conventional communications. In additional to
Rekey Requests, OTAR transmissions include
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
background noise
flow and the speech
signal at transmitting
radio.
Expands the speech
while the noise flow
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