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RE: Info needed



Jack,
I am using a Jim Miller Patch on my 1.2 meter offset Channel Master dish and
it works GREAT. Beats all the other feeds I have tried inc. Helix.
Gunther Meisse
W8GSM


-----Original Message-----
From: owner-AMSAT-BB@AMSAT.Org [mailto:owner-AMSAT-BB@AMSAT.Org]On
Behalf Of Rick Fletcher
Sent: Sunday, March 17, 2002 3:34 PM
To: Jack O'Mara; AMSAT-bb
Subject: Re: [amsat-bb] Info needed


> Jack wrote:
>
> I am using a 1.2 meter offset fed dish with a K3TZ patch
> feed and the received levels seem to be down as compared
> to my 4 foot dish with a coffee can linear feed. Has any
> one used the 1.2 meter dish with the patch feed? I would be
> interested in hearing their results. Or does anyone know
> if the patch is compatible with the 1.2 meter one. Not
> under or over illuminating it. Are the dimensions for the
> patch critical. I'm probably in the ballpark of a 32nd of
> an inch. Good enough?
>

Most patch feed designs are optimized for an f/D of .3 to .4.  Offset dishes
typically have an f/D of .5 to .6.  It should be possible to build a patch
for that dish, but most folks seem to find it easier to build and use a
helical feed.

73 de Rick, KG6IAL


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