Motorola APX 4000 User's Guide download pdf (Page 93)

Advanced Features

English

Use the preprogrammed Top Side (Select) button and Top

(Orange) button to erase the single key in radios with the

single-key option, and to erase all keys in radios with the

multikey option.

1 Press and hold the Top Side (Select) button.

2 While holding Top Side (Select) button down, press the Top

(Orange) button.

3 The display shows Please wait.

4 When all the encryption keys have been erased, the display

shows All keys erased.

Note: 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.

Requesting an Over-the-Air Rekey (ASTRO Only)

This feature, also known as OTAR, allows the dispatcher to

reprogram the encryption keys in the radio remotely. The

dispatcher performs the rekey operation upon receiving a rekey

request from the user.

Procedure:

1 < or > to Reky.

2 Press the Menu Select button directly below Reky.

3 Press the PTT button to send the rekey request.

Press the PTT button again, or the Home or Emergency

button, to exit the feature and transmit in normal mode.

4 If the rekey operation fails, you hear a bad-key tone and the

display shows Rekey fail.

Note: The rekey operation failure indicates that your radio

does not contain the Unique Shadow Key (USK). This

key must be loaded into the radio with the key-variable

loader (KVL) before the rekey request can be sent.

Refer to your local key management supervisor for

more information.

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Motorola APX 4000 User's Guide Page 93