FlightAware blue stick receiving mostly ModeS messages

Here is the scan result.


One with a half wave dipole and the other one with a 4 segment coaxial collinear. And of course, with the blue FA stick.

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That wide band noise where the SAW filter has its passband is typical for an overloaded LNA.

Just for kicks, do a scan without anything connected to the SDR.
If the noise in the SAW filter passband is still there, then the LNA is defective.
Otherwise it’s the LNA being overloaded by noise.

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