6.8. KEYPAD LOCK
The radio has a Keypad Lock function that prevents accidental key presses.
The SRM9022 Controller Microphone keypad lock function may be enabled by the FPP
during configuration. If this function is activated, a key lock icon will be displayed in
the bottom right-hand side of the display 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.
6.9. 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 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 Analogue 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 using the FPP.
6.10. EMERGENCY ALARM
6.10.1. Receiving Emergency Calls
When an emergency call is being received, a message will be displayed on the default
screen ‘RxEm’ indicating the radio unit sending the emergency call.
Doc Number: TNM-U-E-0055 ISSUE 4.0 Page 67
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