[Lowfer] MF Multipath Propagation

[Dale Rice]

Here is another split from a few days back to add to the collection. One
part of the split looks sharper than the other which would seem to me to
indicate multipath.

http://www.orecal.com/argo/NCjan1500000.jpg

Dale Rice


>
> Eric KD5UWL wrote:
>
> > On Sun, 18 Jan 2004, Eric KD5UWL wrote:
> >
> > > Fascinating.  Dale Rice, I believe, saw this effect on my UWL HiFER
signal
> > > back in the late summer or so...
>
> Yes I remember seeing that Eric.  My guess is there are two different
paths the
> signal takes to the receiver.  The Doppler shifted signal has to come from
a
> moving median.  This median would need to move at a speed of 16 km/hr at
13.555
> MHz to produce a 0.2 Hz shift.  But to produce the same 0.2 Hz shift at
1705 kHz
> the median movement would have to be 127 km/hr and 190 km/hr for 0.3 Hz!
>
> Neat Doppler calculator at:
>
> http://www.ualberta.ca/~norris/navigation/DopplerShift.html
>
> Dex