Hear Clear; Radio Lock; Enabling Or Disabling Radio Lock (Secure Radios Only) - Motorola APX 4000XH User Manual

MN001824A01-AT
Chapter 7: Advanced Features
7.16.3.9

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.
7.17

Radio Lock

This Radio Lock feature allows you to lock your radio with a password for security.
The default password is 0123456789. When you turn on your radio for the first time, you must use the default
password to unlock the radio. After successfully unlocking your radio with the default password, your radio
prompts you to change the password to a new one.
NOTE: Change the default password to a new one. You can only proceed when the new password is
confirmed. This feature is applicable to radios with Secure Hardware Encryption.
The new password must be different from the default password. Your service provider determines the
following requirements:
● Number of characters for a password (maximum 10 characters).
● Number of attempts for password entry.
If you exhaust all attempts at entering the correct password, the radio is deadlocked. Restart the radio to start
over.
NOTE:
Depending on the configuration, the radio can carry over the number of attempts remaining even after a
power cycle. If you exhaust all attempts in this configuration, the following occurs:
● The radio remains inhibited.
● All encryptions and secure keys are erased.
7.17.1

Enabling or Disabling Radio Lock (Secure Radios Only)

Procedure:
1. or to Logf.
94