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Message: <blockquote data-quote="s-band" data-source="post: 972499" data-attributes="member: 407744">This is what I get on 25E with the same settings as you. The cursor is on one of the 10500 signals. Note that the loudest signal are the narrow band aero at 1545.120ish. The most obvious are the ~180kHz wide data sigs.[ATTACH]93523[/ATTACH]This is a close-up of the 10500 that's being decoded[ATTACH]93524[/ATTACH]This is the group of 2 1200bps and 1 600bps at 1545.120[ATTACH]93526[/ATTACH]I've got all sorts of mis-matches. Up to the output of the LNA it's 50R then it goes through 40m of CT125 (75R) then back to 50.I thin that you need a decent LNA. The Airspy may have an NF of 4dB compared to my 0.3dB. That's going to make a big difference - cant work it out in my head!</blockquote>