E F Johnson Company 2425372 Benutzerhandbuch

With 5300 ES mobile models, the keys are maintained for approximately eight hours with 
this feature disabled. However, a tamper switch causes immediate key erasure when the 
radio cover over the logic board is removed.

When multiple encryption keys are programmed (see preceding information), the KY SEL 
option switch can be programmed to allow selection of another key for the current 
channel. This feature changes the PID (hardware location) of the key, and the change is 
permanent (cycling power or selecting a different channel does not reselect the original 
key). Therefore, to switch back to the original key, it must be manually reselected. 
Proceed as follows to select a key:

1 Press the KY SEL option switch and HWKEY x is displayed. The “x” indicates the 

current key PID selection.

2 Rotate the Select switch to display the desired key and then press the Select switch to 

select it. Press the KY SEL option switch again to return the display to normal 
operation.

A KY CLR option switch 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.

Basically, the encryption icon 

 is on continuously whenever a secure call is received or 

transmitted. Other operation is as follows:

• It flashes when receiving a secure call in either the secure or clear mode on a digital 

channel.

• It is on continuously when receiving a clear call in the secure mode on a digital channel.

• There is a programmable option on the Radio Wide screen to sound a beep whenever a 

secure call is received on a clear channel.