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Table 15-2: Current Cryptographic Key Display
ENCRYPTION KEY DISPLAYED MESSAGE DISPLAYED
System "SYS KEY"
"KEY = 1"
Group/Channel "GRP KEY"/"CHN KEY"
"KEY = 2"/KEY = 2"
15.2.4.2 Key Zero
All cryptographic keys can be zeroed (erased from radio memory) by pressing the c button
(System Model) or C (Scan Model) and while still pressing this button, press and hold the
o button (System Model) or
O (Scan Model). Press both buttons for 2 seconds. A series
of warning beeps will begin at the start of this 2-second period and then switch to a solid tone
after the keys have been zeroed. The display will indicate KEY ZERO.
If the cryptographic key(s) are zeroed, one or more keys must be transferred from the Key Loader
into the radio before private communications can continue. (Refer to Key Manager TQS3416
Administration and Software Release Notes for further information.)
15.2.5 Private Operation
15.2.5.1 Receiving an Encrypted Call
When receiving, the radio automatically switches between clear or private operation. If the
transmission being received is an encrypted transmission, it will be decrypted, the PVT key light
(System Model) or OPTION key light (Scan Model) will flash, the receiver will unsquelch and the
message will be heard in the speaker. For this to occur, the selected group or channel must be
programmed for private operation and the correct cryptographic key must be loaded into the radio.
15.2.5.2 Transmitting an Encrypted Call
1. Select the desired group or channel.
2. Place the radio in private mode by pressing the PVT button (System Model) or O
(Scan Model). When private mode is enabled, the PVT keylight (System Model) or O
keylight (Scan Model) will be ON.
If the last state of the radio was private mode, the private mode will be enabled on power up.
In addition, the private mode will be enabled if forced operation has been programmed in the
radio
If a group or channel is not programmed for private mode operation, PVT DIS will be
displayed if an attempt is made to enable private transmit mode. It is not possible to operate
on this group/channel in private mode.
If the radio is programmed for forced private transmit operation, FRCD PVT will be
displayed if an attempt is made to disable private transmit mode. It is not possible to transmit
on this group/channel in clear mode.
If the radio does not have the correct encryption key loaded, NO KEY # will be displayed
and the call will not be transmitted.
3. Continue with standard transmission procedures. A private mode access tone will be heard
when the PTT button is pressed.