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MM-012099-001, Rev. B
97
Mode, the radio transmits in the mode of the received call if the hang time is active. If no hang time is
active, the radio transmits private.
Cryptographic keys are transferred to the radio using a cryptographic Keyloader. Up to seven (7)
different cryptographic keys, numbered 1-7, can be transferred from a Keyloader and stored in the radio.
An individual key is automatically selected on a per-group basis according to the radio programming.
Groups and channels within the digital system can be programmed for keys 1-7 (private). Up to 8 banks
of 7 keys can be stored for private systems. The bank is specified per system.
When operating on a group programmed for Private Mode, all transmissions are private transmissions and
the radio receives clear and private signals. The status icon
is displayed when the Private Mode is
enabled. If the selected group is programmed for auto-select capability, the mode may be toggled
between private and clear with the
key, then following the selection mode rules. Radios programmed
for forced private operation do not allow a change of the transmit mode.
10.16.3.1 Displaying the Currently Used Cryptographic Key Number
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 key (for group 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 10-11) or the
group/channel key (Figure 10-12).
Figure 10-11: System Encryption Key Display
Figure 10-12: Group/Channel Encryption Key Display
10.16.3.2 Key Zero
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.