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R: Experience with K3TZ patch -> updated webpage [LONG]




----- Original Message -----
From: Tim Zibrat <tzibrat@adelphia.net>
To: <K5OE@aol.com>; <avollhar@physik.unizh.ch>; <fspinner@hotmail.com>
Cc: <amsat-bb@AMSAT.Org>
Sent: Tuesday, February 19, 2002 1:54 PM
Subject: RE: [amsat-bb] Experience with K3TZ patch -> updated webpage [LONG]


> Hello all,
>
> It's been nice to see the interest in the "K3TZ Patch".  I really
appreciate
> all of the emails I have received, and the help and encouragement from all
> of you.
>
> I would like to apologize to everyone for not getting my web page updated
> with the latest information.  I have really been working massive overtime
> for the last month, my computer motherboard smoked, and the list goes
on....
>
> Back to the subject at hand.  The "K3TZ Patch" is indeed circular.
Charlie
> G3WDG, did some independent testing on his own and shared his results with
> me.  After some discussion with him, I figured my test procedure was in
fact
> flawed.
>
> So I repeated the testing, with a few minor, but important changes, and
> found the patch to be circular as well.
>
> Charlie also found that the use of any spacer between the patch element
and
> reflector degrades performance significantly.  If you use a stiff enough
> material for the patch element, you probably don't need the spacers
anyway.
>
> I also found that the use of a 1" high "cup" reflector (or scalar ring)
> increased the performance of the antenna as well.  This was confirmed by
> Jerry, K5OE.
>
> The antenna can definitely use some improvement on its design.  However,
as
> it is, it works quite well, and much better than a helix feed (or so I've
> been told).
>
> In my very limited spare time, I am currently working on a new version
that
> has the center of the patch grounded.  This will improve the mechanical
> stability, hopefully make construction a little easier, and help to bleed
> off any static build-up on the patch to protect sensitive LNAs.
>
> Again, I apologize for the very late update.  I know several of you have
> suggested to me to at least update the BB while the web page is being
> updated.  I should of taken your advise!!
>
> Thanks again for your all of your emails!!!
>
> Best 73,
> Tim
> K3TZ
>
> <snip>
>
Hi Tim,

It would be very important to know if your patch by himself radiates LHCP or
RHCP because to receive the RHCP AO40 signals a parabolic dish requires an
LHCP feed.

Tank you for this information.

73 de i8CVS Domenico

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>






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