23
Detail
The scrambled call can be set up immediately between two RT5022/RT5020, if both are
having the scrambler application enabled (scramble pin code is set).
The voice scrambler can be initiated by any of the two parties from the main menu (6).
Selecting the scrambler will initiate a sequence similar to a DSC station call. The 9-digit
MMSI number of the receiver station is entered, as well as the working channel. The current
working channel is proposed in the flow (only simplex channels are allowed). A station call
request is now sent to the receiver on the DSC channel.
The call request is received on the RT5022/RT5020 as a normal DSC station call request,
but when the call is acknowledged the scrambler key is automatically negotiated between the
two stations, and conversation is scrambled (scrambling state is clearly visible on the
screen).
The scrambling-mode is abandoned in the following situations:
•
Hook-on (see also 7.1.15)
•
Press
•
Press
•
Press
•
Receiving Distress or an Urgency call types
Please note that some country authorities may request clear voice identification of the two
parties before scrambling is initiated.
Scrambling on channel 16 is prohibited. Scrambling on certain other channels might be
blocked (country specific).
During scrambling the replay function is deliberately disabled.
4.10
Automatic conditions
The following automatic conditions are activated immediately after power-on:
•
If the VHF is starting up with no error messages in the display, or any warning/
error sounds, all functionality is available for the equipment as described in this
manual – all software is running OK.
•
The radios transmitter and transceiver circuits are constantly monitored for stable
frequency, and transmitter output power. Failures detected on these parameters will
be displayed on the VHF information display during normal operation. No special
tests need to be carried out.
0611
Summary of Contents for RT5022 VHF DSC
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