Motorola Solutions Inc. 89FT5864 사용자 설명서

This feature allows 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 Power-
up Acknowledgements. 

Some of the options selected may also need to be set up at the 
Key Management Controller (KMC) site to work properly.

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 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 in a transportation. The fading 

effects, heard as audio pops and clicks, are cancelled without 

affecting the desired audio signal. 

The Random FM Noise Canceller operates only in receive 

mode.

This feature must be preprogrammed by a qualified 
radio technician. Check with your dealer or system 
administrator for more information.