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Thread: Interference on 1090 MHz

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  1. #1
    Passenger
    Join Date
    Oct 2013
    Posts
    19

    Interference on 1090 MHz

    Hello

    I contacted FR24 several times regarding interference on the 1090 MHz band where F-SBFI2 feed is located. I also host FlightAware receiver, which has lost range too. The range decreased from approx 200 nm down to 33-39 nm. Coverage is very poor.

    I had checked using FlightAware ProStick + FlightAware BPF the 1090 MHz band using SDR# (the only tools I have now) and I found a disturbing lump close to 1088 MHz. If the RTL AGC is left on the noise floor skyrockets a very high and disturbing level. I have attached screenshots of SDR# below:

    RTL AGC ON
    RTL AGC ON - TUNER AGC ON.jpg

    RTL AGC OFF
    RTL AGC OFF - TUNER AGC ON.jpg

    I am trying to reach FR24 support but get no reply from them. I managed to get range back using the FA ProStick + BPF as above running with RTL AGC OFF and TUNER AGC ON which gave range back, as below:

    6916341b-70de-4158-8c0f-f069c7dafbf6.jpg

    Is there any way gain could be turned down on a FR24 receiver ? Seems that too high a gain is pumping noise up too much.

    There are no cell towers or anything new in the vicinity. This receiver has been installed on this site for almost two years with no issues.

    Any insights will be much appreciated.

    Ricardo
    F-SBFI2
    Brazil

    EDIT: After posting I realized I posted on the wrong forum. Cannot delete or move post. Sorry for any inconvenience.
    Last edited by ricardogerassi; 2019-03-26 at 23:43.

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