[amsat-bb] Re: L/S helix feed
John B. Stephensen
kd6ozh at comcast.net
Mon Oct 23 21:11:37 PDT 2006
It should be easy to make a high-pass filter that removes the 1.2 GHz
signal. A piece of waveguide with two coaxial to waveguide transitions will
reject everything longer than 1/2-wavelegth in the long dimension of the
----- Original Message -----
From: <w7lrd at comcast.net>
To: <amsat-bb at amsat.org>
Sent: Monday, October 23, 2006 23:46 UTC
Subject: [amsat-bb] L/S helix feed
> Questions on my current L/S helix feed.
> I am building a dual L/S concentric helix feed for a 48x54 inch primestar
> dish. The reflector is cut for L band does that cause a problem with S
> band? Where can I find a good design for a notch filter for S band to
> reduce desense? Where does the focal point want to be on the helicies?
> Or is it pretty forgiving. Any other information is appreciated.
> 73 Bob W7LRD
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