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R: Hearing AO-40 MB at 150 deg. squint?



Hi  Steve,

Probably  a  strong side lobe of the AO40  helix is diffracted against the
corner edge of the satellite metallic structural radiating back to the
earth.

Propagation of MW by diffraction on the crest of mountain i.e. Monte
Bianco,is currently used  for QSO between Italy and Switzerland.

Tank you for your very interesting remark

73 de i8CVS Domenico


----- Original Message -----
From: Steve Diggs <w4epi@mediaone.net>
To: <amsat-bb@AMSAT.Org>
Sent: Friday, June 15, 2001 3:01 PM
Subject: [amsat-bb] Hearing AO-40 MB at 150 deg. squint?


> OK, guys I have a question here:
>
> I am sitting here listening to a very weak AO-40 MB, with Nova indicating
> squint is over 150 degrees. Distance is 6,100 miles, and elevation is 33
> degrees.
>
> I can both pick the sound out by ear, and see the normal "comb" like
> appearance in my DSP waterfall display. (AO40RCV).
>
> How can this be? The antenna is pointed away from me, and I have a big
chunk
> of satellite between the antenna and me. Is the signal bouncing off
> something and then coming back to me? I don't understand how the signal is
> propagating in such a manner that I can hear it in this configuration.
>
> Thanks much,
> Steve Diggs, W4EPI
>
> ----
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