User's Manual

Draft
December 2006 5300 ES Series Mobile Radio Operating Manual -5
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.
11.2.4 Encryption Key Select
Note This feature is available on conventional channels only.
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.
11.2.5 Encryption Key Erase
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.
11.2.6 Encryption Icon Operation
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.