In a near perfect situation (in free space, exact 90 degree misalignment,
perfectly straight elements), I would expect near absolute attenuation, but we
never have those conditions. What we do have is an undefined assortment of
approximately vertical or horizontal antenna structures, reflections, slightly
bent elements, Faraday rotation, and probably a dozen other phenomena that are
above my pay grade.
So....what is the cross polarization attenuation? Well....it depends!
-Mike-
From: Peter Laws <plaws0@gmail.com>
To: vhf contesting <vhfcontesting@contesting.com>
Sent: Sunday, January 29, 2017 10:12 AM
Subject: [VHFcontesting] Attenuation from polarity mismatch (Re: C6AFP Six
Meter Beacon
On Sun, Jan 29, 2017 at 10:38 AM, Buddy Morgan via VHFcontesting
<vhfcontesting@contesting.com> wrote:
> Of course, I am horizontally polarized.
Undoubtedly, that makes a difference ... but how much?
Does anyone have a scholarly (or even semi-scholarly, e.g., QEX, QST)
citation for the amount of attenuation? I've heard anywhere from 3 dB
to 30 dB (and WAGs going even higher). 3 to 30 dB doesn't seem like
much to a lot of hams because they don't understand dB, but that's
2x(ish) to 1000x ... so I'm thinking one of them is wrong ... and
since we all routinely hear signals of the other polarity I'm thinking
it's closer to 3 than 30 ...
Someone has surely done actual research on this. So where is it?
--
Peter Laws | N5UWY | plaws plaws net | Travel by Train!
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