Hi Roland, Yes there are now and then 100 or -100 Hz differences and some with 50 or -50 Hz. The latter is an indication that 50 Hz mains is overloading some section of audio path. It may also happen at the receiver side. I did not analyzed, if this is the case on those 50 Hz instances. But a lot of less than 100 Hz or 50 Hz or some random value; most probably those are airplane reflections.
73, Reino oh3ma From: roland.hartm...@web.de [mailto:roland.hartm...@web.de] Sent: 13. heinäkuuta 2019 22:42 To: 'WSJT software development' <wsjt-devel@lists.sourceforge.net> Subject: Re: [wsjt-devel] FT8 ghost signals Hello Bill, on wspr there is the same symptom. I have filtered the calls with my ID where such one came in last month. Maybe more helpful – there is the exact frequency of such more entries. You can find it as attachment. 73 – DK4RH Roland
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