Advanced Features
English
93
Secure Operations
Secure radio operation provides the highest commercially
available level of voice security on both trunked and
conventional channels.
Unlike other forms of security, Motorola digital encryption
provides signaling that makes it virtually impossible for others to
decode any part of an encrypted message.
Selecting Secure Transmissions
Procedure:
Press the preprogrammed
Secure/Clear
button to the secure
position.
Note:
If the selected channel is preprogrammed for clear-only
operation – when you press the
PTT
button, you hear
an invalid mode tone and the display shows
Clear TX
only
.
The radio will not transmit until you set the
Secure/
Clear
button to the clear position.
Selecting Clear Transmissions
Procedure:
Press the preprogrammed
Secure/Clear
button to the clear
position.
Note:
If the selected channel is preprogrammed for secure-
only operation – when you press the
PTT
button, you
hear an invalid mode tone and the display shows
Secure TX only
.
The radio will not transmit until you set the
Secure/
Clear
button to the secure position.
The radio can be configured to ignore the clear voice or
insecured transmission when the radio is in secured
transmission. Check with your agent for details.
Managing Encryption
Loading an Encryption Key
Note:
Refer to the key-variable loader (KVL) manual for
equipment connections and setup.
Procedure:
1
Attach the KVL to your radio.
APX_4000_M3.book Page 93 Friday, May 31, 2013 12:41 PM
