Hem SAQ Forum SAQ Technical Discussions Automatic keying message (aka "wheel") fpr SAQ

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  • #6898 Svara
    Duncan, K2OEQ
    Gäst

    Thank you for keeping SAQ on the air! I just watched the video of the Christmas 2018 transmission. At about 33 to 34 minuets into the video, the continuous tape loop that sends the “VVV DE SAQ” is shown. I would have expected the tape to be punched in the 2-level “Wheatstone” system, but it is a 5-level, teletypewriter tape. The tape reader is quite large. Is the tape reader doing a 5-level to CW conversion?

    Did outgoing messages typically come into SAQ via 5-bit teletypewriter signal and then get converter to CW to be sent out over the alternator transmitter?

    Thank you,

    Duncan Brown
    K2OEQ

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    • #6904 Svara
      AlexanderSAQAlexanderSAQ
      Keymaster

      Dear Duncan,
      According to the “Manual for the telegraph co.” (“Handbok för Telegrafverket”) from 1933, they were using the 2-line Creed-system perforator and punch hole reader at Gothenburg Radio. The signal was then relayed to the Grimeton radio station over the telephone line.
      The Creed system is a further development of the original Wheatstone system.
      At the radio station, we are in the possess of a perforator and punch hole reader from those days, both seems to be for field use.

      The punch hole reader used at our start-up sequence, is a “Hell” 5-line type, of a more modern style, propably introduced when Morse code was replaced by Telex/Teletype and frequency shift. For example, the radio telegram connection between Sweden (Grimeton) and New York via Tanger, was using this 5-line system however with slightly higher speed (60 Baud) than with Telex/Teletype (50 resp. 45 Baud).

      Regards,
      Fredrik / AlexanderSAQ (with lots of assistance from Ola Hernvall)

      • Det här svaret redigerades för 1 år, 5 månader sedan av AlexanderSAQAlexanderSAQ.
      • Det här svaret redigerades för 1 år, 5 månader sedan av AlexanderSAQAlexanderSAQ.
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