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Re: mounting crossed yagis



The metal Cross boom can be used quite nicely.  Please refer to Kent
Britian's presentation in past AMSAT proceedings (I don't remeber the year
it was held in Ft. Worth, TX I believe).  He did the measurements and
learned there are a couple of spots along the boom that cause problems, but
it will work very well almost anywhere else.

I foolishly lent my copy of the proceedings to another ham, and never got
them back.  If someone would put some more details here on amsat-bb I would
appreciate it.

Thanks and 73,
Joe

----- Original Message -----
From: "Franklin Antonio" <antonio@qualcomm.com>
To: "Jon Ogden" <jono@enteract.com>
Cc: "James Farley" <j.r.farley@ieee.org>; <amsat-bb@AMSAT.Org>
Sent: Monday, August 07, 2000 12:45 PM
Subject: Re: [amsat-bb] mounting crossed yagis


> At 09:20 PM 8/6/2000 -0500, Jon Ogden wrote:
> >However, if you use a metal mast (likely),  a metal crossboom (possible,
> >but not recommended), or you have any other vertical or horizontal metal
> >nearby, potential problems could occur when mounting them in the +
> >configuration.  Mounting in the X configuration helps to ensure that you
> >are decoupled from any other nearby metal objects.
>
> I don't believe this.
>
> I believe that the metal crossboom screws up the polarization whether or
> not the crossed yagis are mounted in the + or X configuration.  Rotation
by
> 45 degrees doesn't fix the boom problem.
>
> I've never seen any measurements or theory that would indicate that X has
> less coupling than +.
>
> ----
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>
----
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