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2.7.3.3
Erasing Encryption Keys
Procedure:
•
Erasing the single key in radios with the single-key option and erasing all keys in radios with the
multikey option by using the preprogrammed Top Side (Select) button and Top (Orange)
button:
a. Press and hold the Top Side (Select) button.
b. While holding Top Side (Select) button down, press the Top (Orange) button.
The display shows Please wait. When all the encryption keys have been erased, the
display shows All keys erased.
NOTICE: Do not press the Top (Orange) button before pressing the Top Side
(Select) button, unless you are in an emergency situation as this sends an
emergency alarm.
2.7.3.4
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.
The Random FM Noise Canceller operates only in receive mode.
2.8
Radio Inhibit
This feature allows the system administrator to put a radio into a non-functional state when the radio is
missing or in an unknown hand. The radio stays in this state regardless of its power changes.
NOTICE:
If the radio has Inter-system roaming capability, the system administrator is able to put the radio
into a non-functional state when missing radio roamed to another system.
The radio can only be uninhibited by receiving an uninhibited command from the system
administrator.
68012005016-DJ
Chapter 2: Advanced Features
55
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