Motorola APX 4000 User's Guide download pdf (Page 116)

Advanced Features

English

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.

Press the Menu Select button directly below Del to delete

any unwanted characters.

Press the Menu Select button directly below Cncl to exit the

feature.

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Motorola APX 4000 User's Guide Page 116