RE: [amsat-bb] Screening BBQ Grill and Helix Feed Questions

[Phil Harman <pharman@xxxxxxx>]

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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