Re: [amsat-bb] GRRRRRRRRRRR!

["Frederick M. Spinner" <fspinner@xxxxxxxxxxx>]

The way Howard has his antennas is like shown in the ARRL Sat book.. this 
has fallen out of favor somewhat as the polarization will always come out 
elliptical rather than circular as the elements are not in exactly the same 
plane.

However, in practice there is no such thing as true circular polarization 
anyway, so in practicallity the system should still work very well.

But I like the nitpick!  :O)

Fred W0FMS


>From: "Howard Long" <howard@howardlong.com>
>To: <amsat-bb@AMSAT.Org>
>Subject: Re: [amsat-bb] GRRRRRRRRRRR!
>Date: Fri, 2 Mar 2001 17:16:09 -0000
>
>Hello Jim
>
>The reason that they're at 45 degrees is for a number of reasons...
>
>o	It's easier (takes less relays, therefore less losses) to phase switch
>between RHCP, LHCP, Horizontal, Linear if you mount at 45 degrees. Check 
>out
>http://www.g6lvb.com/remotepolarization.htm as Christopher Cox has
>mentioned.
>
>o	If you have one horizontal and the other vertical rather than at 45
>degrees, the two antennas are not 'symmetrical' and therefore an unequal
>balance with other external metal bits and pieces, and the ground, so you
>end up with a less well defined lobe.
>
>o	Don't ask me why they're 2m apart. It just works that way though. I never
>tried any other separation.
>
>
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