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Re: Screening BBQ Grill and Helix Feed Questions



how much sun nois are you receiving
nick k5qxj
----- Original Message -----
From: "Phil Harman" <pharman@ddd.com>
To: "Bill Howell" <bhowell@mail.utexas.edu>
Cc: "Amsat List" <amsat-bb@AMSAT.Org>
Sent: Monday, November 12, 2001 9:59 PM
Subject: RE: [amsat-bb] Screening BBQ Grill and Helix Feed Questions


> Bill,
>
> I also went the K5OE route and it worked fine. In particular his method of
> matching using a length of insulated sleeving is so much easier than
> soldering a vane to the first 1/4 turn of the helix. I found I could
> optimise the feed by removing turns from the helix as described. However,
I
> found that it's more important to adjust the number of turns for best
> sun/sky noise ratio rather than just for maximum signal level (i.e.
maximum
> gain). With my dish there was a significant difference in the number of
> turns on the helix for the two conditions. I also found that using a cup
> reflector, rather than a flat plate, made a noticeable improvement so
would
> recommend this form of reflector.
>
> 73, Phil... VK6APH
>
> -----Original Message-----
> From: Jim Jerzycke [mailto:kq6ea@pacbell.net]
> Sent: Tuesday, November 13, 2001 10:29 AM
> To: Bill Howell
> Cc: Amsat List
> Subject: Re: [amsat-bb] Screening BBQ Grill and Helix Feed Questions
>
>
> Go to Jerry's site.
> http://members.aol.com/k5oe
>  He has quite an analysis of what he did, and it sounds exactly like
> what you're looking for.
> 73, Jim KQ6EA
>
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