Advanced Features
English
98
Hear Clear
There are two components of Hear Clear.
1
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.
2
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.
Note:
This feature must be preprogrammed by a qualified
radio technician. Check with your dealer or system
administrator for more information.
Security
Radio Lock
This feature changes your radio to a more robust security
system that protects the use of the secure encryption keys.
If this feature is enabled in your radio by a qualified radio
technician, when you turn the radio on, the display shows
Radio
locked
.
Unlocking Your Radio
Procedure:
1
Enter your numeric password.
Secure-equipped radios – 6 to 8 characters.
Clear radios – 0 to 8 characters.
2
Press the
Menu Select
button directly below
Sel
to enter the
code.
OR
Press the
Menu Select
button directly below
Del
to delete
any unwanted characters.
OR
Press the
Menu Select
button directly below
Cncl
to exit the
feature.
APX_4000_M3.book Page 98 Friday, May 31, 2013 12:41 PM
