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

["Ron Sparks, AG5RS" <rlssat1@xxxxxxxxxxxxx>]

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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