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Problem with reception at close range

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  • Problem with reception at close range

    Hello

    I have a problem with reception at close range at our small Airfield.
    We have a small system consisting of a Raspberry 3 B+, Nooelec SDR sick, a self-built coaxial colinear ADS-B antenna and approx. 10m of cable.
    The antenna is mounted on the hangar roof and the closest aircraft are approximately 10-15m from the antenna.
    In the Dump1090-mutability list I see the aircrafts with an RSSI of -5db.
    But you can't see them on the map.
    The takeoff point is approx. 300m away, in direct line of sight, here too we have an RSSI of approx. -5db.
    But here too, the aircraft are shown in the list but not on the map.

    I also played with the gain, but that didn't help.
    Is it possible that the system is overwhelmed by the proximity of other aircraft in front of the antenna?

    ​greets Mike

  • #2
    Just now the rescue helicopter came back.
    And here you can see the tracked distance.

    2024-03-11 11_17_22-Flightradar24_ Live Flight Tracker - Real-Time Flight Tracker Map.jpg


    There is a take off, tracking starts approx. 2km from the airfield.
    No other traffic at the moment at the airfield.

    2024-03-11 13_40_58-Flightradar24_ Live Flight Tracker - Real-Time Flight Tracker Map.jpg
    Last edited by MikeHotel; 2024-03-11, 12:45.

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