7
OPERATION
Mode Select:
Momentary Switch:
When using a momentary switch, pressing and then releasing the switch will cause the
scrambler to switch modes. A medium tone followed by a high tone indicates the scrambler has been switched
into scrambled mode. A medium tone followed by a low tone indicates the scrambler has been switched into clear
mode.
Latched Switch:
When using a latched switch, pressing the switch will toggle the mode. Depending on the
programmed polarity will determine the mode. For example if the polarity is programmed as low, then the
scrambler will be in scrambled mode when taken to ground. No mode indication tones are available.
Code Select:
Momentary Switch:
When using a momentary switch, pressing and holding the switch will toggle the scrambler
through the programmed codes (1-4 codes). The scrambler will emit a number of tones corresponding to the code
that is being switched to. When the desired code is reached simply release the switch.
Latched Switch:
Multi-code operation is not available when using a latched switch.
Communications:
Once the desired mode has been selected, press and hold the PTT. The scrambler will
generate a scrambled or clear synchronization packet to tell receiving radios whether to go to scramble or clear if
Automatic Detection is enabled. Once the sync packet is transmitted a go-ahead beep is heard to indicate that it
is okay to start the conversation.
Midian’s Kryptic Signaling:
Midian’s TVS-2 and VPU-15 offer the following signaling functions:
ANI:
When the PTT button is pressed the scrambler will generate an ANI to be decoded by Midian’s CAD-300 or
DDU-300.
Emergency ANI (ENI):
When the Emergency button on the radio is pressed and held for 1 second the scrambler
will key the radio and transmit the ANI to be decoded by Midian’s CAD-300 or DDU-300.
Selective Call:
The scrambler can be selectively called from Midian’s CAD-300 or DDU-300. When the scrambler
is called it will generate ringing beeps out the radio’s speaker.
Radio Kill:
The scrambler can be disabled and re-enabled from Midian’s CAD-300 or DDU-300. When the
scrambler receives a disable command it will not allow any receive or transmit audio to pass through the
scrambler or for a PTT command to be given to the radio if the PTT path is controlled by the scrambler. When the
scrambler receives an enable command it will resume normal operation.
Spy:
The scrambler can be sent a command from Midian’s CAD-300 or DDU-300 to key the radio and transmit
ambient noise from the microphone for 00-90 seconds in 10 second increments. This time is preprogrammed into
the scrambler.
Query:
This command sent from Midian’s CAD-300 or DDU-300 will report to the CAD or DDU if the
scrambler/radio is currently on or off.
