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  • My setup is not giving me the results I was hoping for

    Edit: I have purchased a Flightware Pro Stick Plus and the range has increased dramatically, now getting 106nm


    Hello forum,

    as someone with very new Raspberry setup I feel like I need your help to analyze why the range of my setup is quite low.
    I started of with the cheap jetvision ads-b dongle, and a raspberry pi with tiny indoor antenna facing a south window in the attic, roughly 8m above ground.
    The Pi is running dump1090-mutability with agc.
    The peak range reported by FR24 was 72nm, which seemed not great but reasonable to me.
    There was some cellphone interference in the area (image below, compared to the current setup)

    I wanted to achieve more, so I ordered a better antenna and a filter.
    The results however are poor, the range is now reported as 88nm, not at all what I was hoping for.
    The comparison of the frequency scan with indoor antenna vs new antenna+filter setup:
    https://i.imgur.com/NCjUt9d.png

    I also ran the "strong signals" method from here and i get a 0.15% number even with max gain instead of the 5% that are said to be a good number for it.
    Edit: Now at 0.5% at max gain


    The building is in an area of medium density, other buildings are not much higher. Some trees are here that are taller.
    However there is a silver vapour barrier all over the inside of the roof, which might be aluminum foil. I once put the indoor antenna directly into the peak of the roof and reception was totally dead.

    Now I need your help what to do next:
    Where can I improve this setup to get a resonable range?
    Is the filter to poor. can the Jetvision dongle not handle it or Is the building roof construction a complete death sentence for good signals from 360?

    I am hoping you can help me, otherwise the pricey hardware that only gave me another 25nm will be returned, I am a bit frustrated about this situation.

    Thank you very much for your ideas!
    Last edited by utack; 2020-02-19, 15:17.

  • #2
    An update on the situation:
    Flightware pro stick has given me massive gains already
    Holding the antenna outside the window on a mast gives a huge boost, so that is a indicator the building is shielded
    And my cellphone is also entirely dead on the roof, this is not even the case deeper inside other buildings

    It must be concluded the aluminium vaopour barrier wrapped around the entire roof is a shield for all signals and indoor antennae at my position are doomed

    Comment


    • #3
      Can you get the antenna mounted just above the apex of the roof? Assuming there are no other higher buildings nearby that will give the best possible results.

      Comment


      • #4
        Originally posted by jackthom View Post
        Can you get the antenna mounted just above the apex of the roof? Assuming there are no other higher buildings nearby that will give the best possible results.
        I am working on it, a place to mount it exists, but I will have to see how the grounding works first

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