[Moon-net] Activity report 23 cm 9 & 10 feb PA3FXB

[Edward Cole]

At 04:54 AM 2/12/2008, Joe Taylor wrote:
>Hi Jan, Sven, and all,
>
>Jan van Muijlwijk wrote:
> > For Sven SM5LE:
> > My North-East window is blocked by a big tree.
> > I noticed the same thing you mentioned.
> > When receiving through the tree it often happens that there are 
> good signal levels, but no decodes...
> > So the tree does "something" with the signal.
>
>I would be very much interested to have a few *.WAV files that exhibit
>the behavior you are talking about.  It might be possible to determine
>what the "something" is, that the tree does to your received signal --
>and to program the decoder to compensate.
>
>If you can tell me what the undecoded message for each file was supposed
>to be, so much the better.
>
>With best wishes,
>
>         -- 73, Joe, K1JT
>
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Jan and all:

Yes, very interesting observation.  Since by your report you are 
using Linrad then maybe you noted the signal level.  I will hazard a 
guess that the tree is causing scattering or multipath effects.  How 
is JT65 affected by either the phase shifts or selective 
fading?  This is at 23cm, right?  Also what were the wx 
conditions?  Calm or windy?  What species and how dense the trees if 
more than one?  I hope you can provide Joe with .wav files as it 
would be interesting to have Joe's analysis.

I am QRV on 23cm (sort of) for tropo, and will try go install a 4.9m 
dish for eme this summer.

73, ED - KL7UW