Hi all... You may check also: http://dx.3sdesign.de/index.htm?airplane_scatter.htm
I like hunting ghost signals and decode them ! Do you? ;) Especially on 6m band when they are scattered from high muf clouds, Muf just bellow 6m but also scattered, multipath scatter etc... Best of all i will never know what is involved to scatter those signals. That makes 6m band a Magic and in most cases a tragic band ;) 73 Patrik 9A5CW ned, 7. srp 2019. 22:59 Bill Somerville <g4...@classdesign.com> je napisao: > On 07/07/2019 16:50, David Tiller wrote: > > -70 Hz at 50.313 MHz is a relative velocity of about -209 m/s or -468 > > mph. That's in the ballpark for a jet aircraft. > > > Hi David and all, > > here is a handy web resource: > > http://www.rfcafe.com/references/electrical/doppler.htm > > note the first of the two formulae at the bottom of the page which is > most relevant. Particularly the extra factor of two to account for the > incident and reflected Doppler shifts. > > With respect to the apparent prevalence of fixed frequency shifts, this > can probably be accounted for by more distant reflectors whose velocity > relative to the receiving and transmitting stations is changing at a > lower rate than for aircraft closer in whose paths have greater angular > rates or may pass overhead at one of the stations, thus reversing the > relative velocity. > > The presence of Es reflected/refracted signals may include Doppler > shifted signals from aircraft reflections themselves, so during an Es > opening these frequency shifted/shifting signals may well be far more > common. > > 73 > Bill > G4WJS. > > > > _______________________________________________ > wsjt-devel mailing list > wsjt-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/wsjt-devel >
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