User's Manual

H-7YCPD0002-0 EDITION 1

8.7.4.2 Key Zero

All cryptographic keys can be zeroed (erased from radio memory) by pressing the CLEAR

and while still pressing this button, press and hold the OPTION. Press both buttons for 2

seconds. A series of warning beeps will begin at the start of this 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 Key

Loader into the radio before private communications can continue. (Refer to Key Manager

TQS3416 Administration and Software Release Notes for further information.)

8.7.5 Private Operation

8.7.5.1 Receiving 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 receiver

will unsquelch and the message will be heard in the speaker. The selected group or channel

must be programmed for private operation and the correct cryptographic key must be

loaded into the radio for this to occur.

8.7.5.2 Transmitting an Encrypted Call

1. Select the desired group or channel.

2. Place the radio in private mode by pressing the OPTION.

If the last state of the radio was private mode, the private mode will be enabled on

power up. In addition, 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 is programmed for forced private transmit operation, FRCD PVT will be

displayed if an attempt is made to disable private transmit mode. It is not possible to

transmit on this group/channel in clear mode.

If the radio does not have the correct encryption key loaded, NO KEY # will be displayed

and the call will not be transmitted.

3. Continue with standard transmission procedures. A private mode access tone will be

heard when the PTT button is pressed.