Antenna-direction – The Alexander association

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  • This topic has 5 replies, 2 voices, and was last updated 4 weeks, 1 day ago by Ola Hernvall.
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  • #8202 Reply
    Jens Romeikat
    Guest

    Hallo,
    It can be read that Alexanderson antenna was build to transmit
    towards the USA.
    But the line of the antenna-towers points more towards Spain.
    (Google Maps)
    How does that come?
    Regards
    Jens Romeikat

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    • #8234 Reply
      Ola Hernvall
      Guest

      The SAQ-antenna is almost omnidirectional at 17.2 kHz. At for example 50 kHz the radiation pattern is a figure of eight, perpendicular to the tower line. The great circle to New York can be seen on the following link (Grimeton is situated 60 km south of Gothenburg Airport): https://drive.google.com/file/d/1bzSZ_YCDWKwsE8wIkxdX77fk8TLaYJUZ/view?usp=sharing

    • #8233 Reply
      Erik ThomsenErik Thomsen
      Participant

      An Youtube video(in Swedish)may give the explanation why the antenna points too far north.
      They wanted to have a ‘clear view’ over the horizon (north of Scotland and Denmark)

      Erik

    • #8232 Reply
      Jens Romeikat
      Guest

      Thank for the information !
      By the way:
      To hear “Now we are on the air!” in the youtoube-live video
      yesterday and see the first lines the same time on web-sdr:
      unforgettable !!!

      Jens

    • #8231 Reply
      Erik ThomsenErik Thomsen
      Participant

      I take it the main radiation is perpendicular to the line of masts,
      but that would hit somewhere in the north of Canada(seen on a globe).
      Hälsninger
      Erik

    • #8220 Reply
      AlexanderSAQAlexanderSAQ
      Keymaster

      Dear Jens,
      The antenna towers are directed towards Long Island, outside New York, where the receiving station was located.
      My theory is that its because Googe Maps uses the Mercator projection type for its map images. It gives accurate ‘zoomed-in views’ but this projection also distorts a ‘zoomed-out view’, which will make it look like the antenna towers are pointing in another direction.
      Maybe there is a better explantion out there.
      Regards,
      Fredrik / AlexanderSAQ

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