[amsat-bb] Re: L/S helix feed

["John B. Stephensen" <kd6ozh@xxxxxxxxxxx>]

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 
guide.

73,

John
KD6OZH

----- Original Message ----- 
From: <w7lrd@comcast.net>
To: <amsat-bb@amsat.org>
Sent: Monday, October 23, 2006 23:46 UTC
Subject: [amsat-bb] L/S helix feed


> Hello
> 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
> Seattle
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