Secure Operations; Selecting Secure Transmissions; Selecting Clear Transmissions; Managing Encryption - Motorola APX 4000 User Manual

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

Turn the preprogrammed Secure/Clear switch 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 switch to the clear position.

Selecting Clear Transmissions

Turn the preprogrammed Secure/Clear switch 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 switch 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.
1 Attach the KVL to your radio.
The display shows Keyloading, and all other
radio functions, except for power down, backlight,
and volume, are locked out.
2 Select the required keys and press the Menu
Select button directly below LOAD on the KVL.
This loads the encryption keys into your radio.
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