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P25 SRM9030/9030
Plus
– OPERATING INSTRUCTIONS
TNM-U-E-0094
Oct 15 (Iss. 2.0)
Page 54
COMMON FUNCTIONS
6.8
E
NCRYPTION
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.
6.9
E
MERGENCY
A
LARM
6.9.1
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.
6.9.2
Making an Emergency Call
When the emergency key is pressed and held for a specific time (determined by the FPP), 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
icon.
Frozen
. The default screen will freeze, with the
icon displayed indicating emergency
mode.
Blank
. The screen will blank giving no indication to others that the radio is in emergency
mode.
When emergency mode is triggered, the radio can be configured by the FPP to transmit and
receive on a cyclic basis with FPP programmed time periods. The display will show
‘
TX
Em
’:Channel No.
During Tx, the radio will generate an emergency broadcast call on either the currently selected
channel or an FPP nominated channel.
Others may listen to the automatic transmissions to hear conversations near the radio.
Turning the radio off and on will disable emergency mode.