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please help! no ADSB-Data with new Antenna and new Preamp

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  • please help! no ADSB-Data with new Antenna and new Preamp

    Hello around and good morning!

    I am not an ADSB specialist and need a little help. In the last few years I have operated a noelec R820T on a stub antenna. The reception was poor, but I could see some planes.

    Now I wanted to improve the situation and have purchased an Uputronics 1090MHz ADS-B Filtered Preamp and a FlightAware 1090 MHz ADS-B N-type antenna 26 "- 5.5dBi (this).
    The ADSB signal level has now risen from -30dBFS to 0dBFS, however, the number of ADSB messages goes back to 0. The preamplifier seems to be working correctly, but the software is obviously no longer receiving ADSB messages.

    How can I solve this problem? Can anyone give me a hint? Did I do something wrong??

    Best regards.
    Peter

  • #2
    Seems dongle got overloaded due to high gain Uptronic amplifier.

    Reduce gain. Try different values such as 20 25, 30, 35 to find which one gives best resuts.

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    • #3
      OK thanks! I'll test it in a moment ...

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      • #4
        OK. Unfortunately no improvement.

        I increased the gain step by step from 20 to 35 and waited one minute each time. I see max. 1 aircraft 50 miles away and sometimes two more without altitude or position. See image.

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        • #5
          ok at gain 35 and wait 3 minutes I get that (set new gain at 11:35)

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          • #6
            that could be so right, I'll watch it ... thank you very much for the help!

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            • #7
              Try 43.9, the all time favorite gain for FA SDRs.

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              • #8
                Thank you. I'ill try it today...

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                • #9
                  https://github.com/wiedehopf/adsb-wi...ptimizing-gain

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