TMC Radio P25 SRP9100, Operating Instructions Manual

Page: 47 / 55

SRP9100 RADIO P25 – OPERATING INSTRUCTIONS
The keypad lock function is enabled by the Field Programmer during configuration. If this
function is activated, a key icon will be displayed in the bottom right-hand side of the display
when locked.
The PTT, Alarm Key (if assigned), 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 keys will be enabled.
The keypad will automatically re-lock after a period of 10 seconds following no key activity.
5.1.11 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.
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A radio channel that has been programmed for encryption will receive either clear or
encrypted traffic. A transmission on this channel will be encrypted.
The encryption icon will not be shown if a received signal is not encrypted when on an
encrypted channel.
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 Field Programmer.
5.1.12 Emergency Alarm
5.1.12.1 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.
5.1.12.2 Making an Emergency Call
When the emergency key is pressed and held for a time determined by the Field
Programmer, the radio will change to emergency mode. Under emergency mode, the radio
can operate in three FPP 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.
© TMC Radio 2007 Page 47 TNM-U-E-0073 1.1b