Secure Operations; Selecting Secure Transmissions; Selecting Clear Transmissions; Managing Encryption - Motorola ASTRO APX 4000 Series Quick Reference Card

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:
Turn 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.

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.
2
The display shows Keyloading, and all other radio
functions, except for power down, backlight, and volume,
are locked out.
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