Re: [amsat-bb] GRRRRRRRRRRR!

[Jon Ogden <na9d@xxxxxxxxxxxxxx>]

on 3/1/01 3:21 PM, John / NS1Z at ns1z@arrl.net wrote:

> Hmmmmm!!??? Wouldn't you have to spin that Arrow antenna pretty fast to
> achieve circular polarization? The best (?) approach is to use linear
> polarization. Your signal is down 3 dB but the fade due to polarity changes
> is non-existant.....

Not really correct, John.

If the CP signal you receive is PERFECTLY circular, then yes, you'll only be
3 dB down.  HOWEVER, most of the time your signal will be elliptically
polarized one way or another.  That means that if your linear antenna is
orthogonal to the main part of the ellipse, then you have much worse than a
3 dB drop depending on the eccentricity (I think that's the right word) of
the ellipse.

So yes, you still could get fades with a linear antenna and you most likely
will.

73,

Jon
NA9D

-------------------------------------
Jon Ogden
NA9D (ex: KE9NA)

Member:  ARRL, AMSAT, DXCC, NRA

http://www.qsl.net/ke9na

"A life lived in fear is a life half lived."

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