Copyright © 2015 RCA Communications Systems
RPX4500/RPX4600 P25 PORTABLE RADIO – USER MANUAL
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6.9. KEYPAD LOCK
The radio has a Keypad Lock function that prevents accidental key presses.
The keypad lock function may be enabled by the PS during configuration. If this function is
activated, a key icon
will be displayed when the keypad is locked.
The PTT, Alarm Key (if assigned) and Reset Key (if assigned) are not locked.
To unlock the keypad, it is necessary to press and hold down the OK key for 2 seconds. After 2
seconds, the key icon will disappear and the keypad will be enabled.
The keypad will automatically re-lock after a period of 10 seconds following no key activity.
6.10. ENCRYPTION
In P25 Digital mode, radio channels may be programmed for encryption.
The encryption state of the selected channel is determined by the radio configuration.
An
encrypted channel will display the
%
encryption icon.
A radio channel that has been programmed for encryption will receive either clear or encrypted
traffic. A transmission on this channel will be encrypted.
When the radio is on an encrypted channel, the encryption icon will not be shown if a received
signal is not encrypted.
The current channel’s transmit encryption key can be temporarily changed from the Crypto
menu.
When in Analog FM mode, there is a simple voice inversion scrambler for low security
applications.
A double beep will sound at the start of each PTT.
The scrambler function key is assigned through the PS.
6.11. EMERGENCY ALARM
6.11.1. RECEIVING EMERGENCY CALLS
When an emergency call is being received, a message will be displayed on the default screen
‘RxEm’ indicating the radio unit that is sending the emergency call.
6.11.2. MAKING AN EMERGENCY CALL
Your radio will change to emergency mode when the emergency key is pressed and held for a
specific amount of time (determined by the PS). In emergency mode, the radio can operate in
three PS configurable modes:
• Normal - The radio will continue to respond to PTT, channel change etc. while displaying the
E
icon.
• Frozen - The default screen will freeze, with the
E
icon displayed indicating emergency
mode.
