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Re: Helix Feed for a Dish



Start jittering & shaking... caffiene is good, especially when the satellite 
pass is at 4 AM! :O)

Fred W0FMS


>From: Douglas Braun & Nadia Papakonstantinou <doug@dougbraun.com>
>To: "Frederick M. Spinner" <fspinner@hotmail.com>
>Subject: Re: [amsat-bb] Helix Feed for a Dish
>Date: Fri, 01 Jun 2001 16:50:06 -0400
>
>I am planning to give it a try, as soon as we use up
>the coffee in the can...  :-)
>
>Doug
>NA1DB
>
>
>At 03:12 PM 6/1/01 , you wrote:
>
> >>I have a DSS dish that I hope to use a G3RUH design helix (about 4
> >>turns?), and a Hammond aluminum box as the cup reflector.
> >
> >Has anyone figured out if the "cup reflector" cavity makes any difference 
>at all when used as a dish feed?  Obviously a standalone helix is does 
>(more gain) but as a dish feed, pattern is more important than gain.  But 
>then again, a choke ring on a Chapparrel type feed decreases sidelobes, so 
>there is a strong probability that there will be a difference.
> >
> >Fred W0FMS
> >
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