Tyco Electronics P5200 사용자 설명서

72 

To Display the Currently Used Cryptographic Key Number 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 

 button. 

2.  Use the 

 or 

 button to select "DISP KEY." 

3.  Then use the 

 or 

 button to toggle between displaying the system key (Figure 9-8) or the 

group/channel key (Figure 9-9). 

 

 

All cryptographic keys can be zeroed (erased from radio memory) by pressing the 

 button and while 

still pressing this button, press and hold the 

 button. Press both buttons for 2 seconds. A series of beeps 

will begin at the start of the 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 may continue. 

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   icon is displayed, 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.