E F Johnson Company 2425795 Benutzerhandbuch

Viking™ VP600 Portable Radio Operating Manual

8-5

An Erase Key menu item can be programmed that allows the user to permanently erase all 
stored keys. If OTAR TEK and KEK keys are stored, all keys of both types are erased. 
This function can be used to ensure that unauthorized encrypted calls can no longer be 
placed or received by a radio.

The following transmit options are available when encryption is selected:

“Clear” - All calls are in the clear mode unless responding to a secure call. If the 
response is then made within the delay time, it occurs in the secure mode.

“Secure” - All calls are made in the selected secure mode.

“Switched” - The mode is selected by the Clear/Secure button. When the clear mode is 
selected by this button and a secure call is received, or vice versa, you will hear a beep. 
Press the programmed option button to change to the appropriate mode.

If the channel has been strapped “Clear” and the option button selects the “Secure” mode 
on power up and a transmission is attempted, transmitting is disabled. Likewise, if the 
channel is strapped “Secure” and the option button selects the “Clear” mode on power up 
and a transmission is attempted, the transmitter is disabled.

The radio can be programmed to ignore the “Clear” or “Secure” button setting. These 
preceding indications then do not occur and transmissions always occur in the strapped 
mode.

If the Clear/Secure button or menu parameter are not programmed, the radio is always in 
the last known state (usually Clear) and there is no way to change it. For example, if the 
last known state is Clear and this parameter is not selected, it is never possible to transmit 
a Secure message on a channel strapped Secure. An error tone sounds.