Technical Details
The DSC is a synchronous system using characters composed from a ten-bit error detecting code. The bits are encoded using frequency shift keying at 100 Baud. For High Frequency and Medium Frequency single side band marine radio an audio tone of 1 700 Hz ± 85 Hz is generated and passed to the modulator. For VHF the two frequencies used are 1300 and 2100 Hz. Each character is transmitted twice with a time delay. The detailed specification is published in the International Telecommunications Union recommendation ITU-R M.493-12
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