RE: [amsat-bb] Re: S-Band musings

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

I, on the other hand have had good luck with grounding the center of the 
patch, but like grounding the boom on a yagi, the element(s) need to be 
larger to compensate for the area that is grounded-out.

Fred W0FMS

>From: "Ron Sparks, AG5RS" <rlssat1@attglobal.net>
>To: <amsat-bb@AMSAT.Org>
>Subject: RE: [amsat-bb] Re: S-Band musings
>Date: Thu, 24 Oct 2002 09:33:10 -0500
>
>While the electrical models say a conducting screw down the center is okay,
>in practice it isn't always that predictable.
>
>K5OE hase done a lot of work on 1.2 and 2.4 GHz patches.  When he and I
>measured them, the metal screw was okay until he tried it on 2.4.  On that
>patch he had to swap back to Delrin/Nylon to get it to tune properly.  See
>his website at http://members.aol.com/k5oe/
>
>Just a "for what its worth" comment.
>
>Good luck,
>
>Ron, AG5RS
>
> > -----Original Message-----
> > From: owner-AMSAT-BB@AMSAT.Org On Behalf Of Bill Acito W1PA
> > Sent: Thursday, October 24, 2002 8:13 AM
> > To: amsat-bb@AMSAT.Org
> > Subject: [amsat-bb] Re: S-Band musings
> >
> > >I  thought about using a slab
> > >of teflon or delrin (of the correct thickness) epoxied between the
> > >patch and the reflector. I'm assuming it's the screws through the patch
> > >and reflector that hose things up.
> >
> > John,
> >
> > Based on the designs I have seen from W0LMD, I would assume a single
> > screw dead center through the K3TZ design would be fine, and also DC
> > ground the patch.
> >
>[snip]
>
>----
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