User's Manual

10. Disconnect the cable from the extended option cable. Press the

(Scan Model) or c (System Model) button to exit the keyload operation.

The radio will change to the selected group or channel as indicated in the

display.

Displaying the Currently Used Cryptographic Key Number

To display the cryptographic key currently in use for either the system

encryption key (for special call such as individual, phone, all, agency or fleet)

or the group/channel key (for group or conventional calls), perform the

following procedure:

1. Press the

m button.

2. Use the

, or . button (ramp control) to select DISP KEY. Then press

the

m (SEL) button.

3. Then use the

, or . buttons to toggle between displaying the system key

or the group/channel key.

Table 6 – Current Cryptographic Key Display

ENCRYPTION KEY DISPLAYED MESSAGE DISPLAYED

System "SYS KEY"

"KEY = 1"

Group/Channel "GRP KEY"/"CHN KEY"

"KEY = 2"/KEY = 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 Keyloader into the radio before private communications can

continue.

Private Operation

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 keylight (System Model) or OPTION keylight

(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