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.
>
>
>
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