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
Read more about this topic: Digital Selective Calling
Famous quotes containing the words technical and/or details:
“When you see something that is technically sweet, you go ahead and do it and you argue about what to do about it only after you have had your technical success. That is the way it was with the atomic bomb.”
—J. Robert Oppenheimer (1904–1967)
“Anyone can see that to write Uncle Tom’s Cabin on the knee in the kitchen, with constant calls to cooking and other details of housework to punctuate the paragraphs, was a more difficult achievement than to write it at leisure in a quiet room.”
—Anna Garlin Spencer (1851–1931)