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8-8 

Viking™ VP600 Portable Radio Operating Manual

The OTAR capabilities of the SEM equipped VP600 radio are as follows. 

• Keysets

- Up to three keysets are used and it is assumed all three are always present. Keyset IDs 

1 and 2 are for TEKs and only one is active at a time. Keyset ID 255 is for KEKs and 
is considered active all the time.

- Each keyset can have up to 126 keys. However, 16 or less are normally used.

The following additional option buttons can be programmed with the VP600 to control 
OTAR functions. They are also available as Viking Portable radio menu parameters unless 
noted otherwise.

Change Keyset - Toggles the active keyset between Keyset 1 and Keyset 2. The new 
active keyset is briefly displayed and then normal operation resumes. When the Viking 
Portable menu is used, the current active keyset is indicated by an indicator icon. To 
change to the other keyset, highlight it and press the 

 (Menu) button.

Clear/Secure Select - This enables and disables encryption regardless of whether 
OTAR is used. Refer to Section 8.3 for more information.

Erase Keys - Erases all TEK and KEK keys contained in the radio.

Key Select - This allows a different key to be selected for the current channel or group 
(conventional channels only). Refer to Section 8.2.4, "Encryption Key Select" for more 
information.