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Re: Helix Feed for a Dish



I tried the reverse today. I have a 3 turn helix (0.75" turn spacing) with a
square "cup" feeding a 33" 0.3 F/D dish. With the 4" x 4" x 2.25" cup I
measured 1.9 dB of Sun noise. After removing it the difference between Sun
noise and noise when pointed straight up decreased to 1.2 dB.

73,

John
KD6OZH

----- Original Message -----
From: <K5OE@aol.com>
To: <fspinner@hotmail.com>; <amsat-bb@AMSAT.Org>
Sent: Friday, 01 June 2001 23:09 UTC
Subject: Re: [amsat-bb] Helix Feed for a Dish
> It would be very educational if someone who currently has a "regular"
helix
> feed with reflector could take noise measurements and then install a cup
> around the feed and observe/report the difference.
> 73,
> Jerry, K5OE


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