HARRIS CORPORATION TR-0054-E Manual Do Utilizador

50 

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.  Use the 

 or 

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

group/channel key (Figure 8-10). 

 

 

All cryptographic keys can be zeroed (erased from radio memory) by pressing the   button and while still 
pressing this button, press and hold the OPTION 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 will be 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. 

1.  Select the desired group or channel. 

2.  Place the radio in Private Mode by pressing 

 key; then follow the selection mode rules. On a 

System radio, the 

 key can be used to toggle the Private Mode ON/OFF. When Private Mode is 

enabled, the   icon is displayed.