must be equipped with the optional encrypt/decrypt
feature and the transmitting and receiving units must
have identical cryptographic keys.
Aegis transmissions cannot be received by a
radio set to receive a Voice Guard transmission. Ac-
cordingly, a Voice Guard transmission cannot be re-
ceived by a radio set to receive an Aegis transmission.
Cryptographic keys are transferred into the radio
using a cryptographic Keyloader. Up to seven (7)
different cryptographic keys, numbered 1 - 7, can be
transferred from a Keyloader and stored in the radio.
An individual key is automatically selected on a per-
group/channel basis according to the radio’s pro-
gramming. Groups and channels within Aegis
systems can be programmed for keys 1 - 6. Groups
and channels within Voice Guard systems can be
programmed for keys 1 - 7.
DES radios require a DES Keyloader (option
V4025). Operating details on the DES Keyloader are
contained in LBI-31541. VGE radios require a VGE
Keyloader (option V4028). See LBI-31685 for operat-
ing details on the VGE Keyloader.
When operating on a group or channel pro-
grammed for private mode, all transmissions will be
private transmissions and the radio will receive clear
and private signals. The "PVT" status flag in the
display turns on when the private mode is enabled. If
the selected group or channel is programmed for
autoselect capability, the mode may be toggled be-
tween private and clear using the 2nd - PVT buttons
(shifted SPC). Radios programmed for forced private
operation do not allow a change of the transmit mode;
the PVT button does not function.
Transferring Keys Into The Radio
The following procedure outlines basic key trans-
ferring steps.
1.
Turn the radio off.
2.
Plug the modular connector of the Keyloader
cable into the Keyloader’s modular jack.
Before private messages can be sent or
received, one or more cryptographic keys
must be transferred into the radio from the
Keyloader.
NOTE
14
