Hem SAQ Forum SAQ Transmissions Audio decoding Svar till: Audio decoding

#11449
rich.g.williams
Deltagare

This is very interesting, I have seen gerke-decoder mentioned on other forums and realise now that you wrote it back in 2020. Mathematically it very interesting with the integration approach. Have you experimented with cross-plotting interval times (on a test basis) to give a graphic representation? Do you assign a statistical probability to dots, dashes, spaces?

I only started receiving SAQ last year and when I did my first decode was reading the screen and using pen and paper to work out each letter. This last decode on Alexanderson day was faster, perhaps because I knew what was coming and could guess what words were after two or three letters.

As I understand it (and have read), that to turn on and turn off transmission of the 17.2 kHz carrier takes time so SAQ so as you mentioned previously “the intention was to send at 15 WPM then the early transmission was an amazing accomplishment” !!

In the old days (I’m talking about the 1960’s) Short wave radio was used extensively, Morse speeds could get quite high even over 15 WPM. I think 20 WPM was not uncommon.

I was really interested in amateur radio and wanted to get a licence but passing the RSGB Morse test was a problem for me. As a young teenager there was getting to the exam, there was how to practice. I felt that I would never learn to transmit and receive Morse at the 12 WPM needed for the exam – so regretfully I left it back then and got interested in sound systems and microprocessors instead.

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