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MM23772, Rev. F
101
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.
10.17.4 Private Operation (P7200 Only)
10.17.4.1 Receive an Encrypted Call
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.
10.17.4.2 Transmit an Encrypted Call
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.
3. If the last state of the radio was Private Mode, the Private Mode will be enabled on power up. Also,
the Private Mode will be enabled if forced operation has been programmed in the radio.
If a group or channel is not programmed for Private Mode operation, PVT DIS will be displayed if
an attempt is made to enable private transmit mode. It is not possible to operate on this group/channel
in Private Mode.
If the radio does not have the correct encryption key loaded, NO KEY# will be displayed and the call
will not be transmitted.
4. Continue with standard transmission procedures. A Private Mode access tone will be heard when the
PTT button is pressed.
10.17.4.3 Scanned Group Calls
Receiving a Scanned Group Call is the same as receiving a selected group call. During the scan hang
time, if the radio was programmed for autoselect, it will transmit back in the same mode it received the
call. For example, if a clear group is entered in the scan list, it will only receive clear calls. If the same
group was available in private and entered in the scan list, it can receive clear and private calls, provided
autoselect was programmed in the radio. The user can select transmitting on the scanned or selected
group. If a group is entered in the scan list more than once and in different modes (clear, digital, private),
only the first occurrence of the group will be used.
Table 10-7: Transmit/Receive Mode Compatibility for Digital Voice Operation
GROUP/CHANNEL
PROGRAMMING
(TRANSMIT)
CLEAR
RECEIVE
DIGITAL
RECEIVE
PRIVATE
RECEIVE
CLEAR Yes No No
DIGITAL Yes Yes No
PRIVATE Yes No Yes*
*assumes the proper cryptographic key is loaded