4 private operation (p7200 only), 1 receive an encrypted call, 2 transmit an encrypted call – Tyco Electronics P5200 User Manual

Page 101: 3 scanned group calls

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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

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