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Wednesday, November 12, 2014
TRANSMITTING DATA LONG-DISTANCE WITH MORSE CODE
November 12, 2014 by Ethan Zonca
[Konstantinos] wrote in to tell us about his CDW project ( http://qrp.gr/cdw/ ): a
digital encoding scheme for ham radio that uses CW (continuous wave) Morse code
for digital data transfer. CW operation with Morse code is great for
narrow-bandwidth low-speed communication over long distances. To take advantage
of this, [Konstantinos] developed a program that takes binary or text files,
compresses them, and translates them to a series of letters and numbers that
can be represented with Morse code.
The software translates the characters into sequences of
Morse code pulses, and plays an audio stream of the result. His software
doesn’t support decoding Morse from an audio stream, so [Konstantinos]
recommends using one of many existing programs to get the job done.
Alternatively those with a good ear and working knowledge of Morse can
transcribe the characters by hand.
After receiving a broadcast, the user pastes received
characters back in the software. The software re-assembles the binary file from
the Morse characters and decompresses the result. [Konstantinos] also added a
simple XOR encryption feature, but keep in mind that using encryption on ham
radio bands is technically illegal.