Antenna-direction – Vänföreningen Alexander

Hem SAQ Forum SAQ Technical Discussions Antenna-direction

  • Skapare
    Ämne
  • #8202 Svara
    Jens Romeikat
    Gäst

    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

Visar 4 svarstrådar
  • Författare
    Svar
    • #8234 Svara
      Ola Hernvall
      Gäst

      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 Svara
      Erik ThomsenErik Thomsen
      Deltagare

      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 Svara
      Jens Romeikat
      Gäst

      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 Svara
      Erik ThomsenErik Thomsen
      Deltagare

      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 Svara
      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

Visar 4 svarstrådar
Svar till: Antenna-direction
Information om dig: