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MN004482A01-AN
Chapter 7: Advanced Features
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Press the PTT button again, or the
normal mode.
If the rekey operation fails, you hear a bad-key tone and the display shows Rekey fail.
NOTE: The rekey operation failure indicates that your radio does not contain the UKEK or USK.
7.18.3.7
MDC OTAR (Conventional Only)
This feature allows you to view or define the Motorola Data Communications (MDC) Over-the-Air Rekeying
(OTAR) features. This feature 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.
NOTE: This feature must be programmed by a qualified radio technician. For more information, contact
your system administrator.
7.18.3.8
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. The Infinite
UKEK Retention settings can be different for each secure profile.
NOTE: This feature must be programmed by a qualified radio technician. For more information, contact
your system administrator.
7.18.3.9
Hear Clear
Hear-Clear is a noise reduction system that consists of Companding and Random FM Noise Canceller.
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.
NOTE: This feature must be programmed by a qualified radio technician. For more information, contact
your system administrator.
102
or Emergency button, to exit the feature and transmit in
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