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Re: Helix Feed for a Dish
- Subject: Re: [amsat-bb] Helix Feed for a Dish
- From: "Frederick M. Spinner" <fspinner@xxxxxxxxxxx>
- Date: Fri, 01 Jun 2001 19:12:15 -0000
>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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