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Re: Grid Dish and Helix Feed



The helix has a roughly circular pattern so the dish surface will either be
under or over illuminated. Its probably best to treat it as a 2+ foot
circular reflector with a CP feed. This may limit the signal improvement.

73,

John
KD6OZH

----- Original Message -----
From: <Rm2642@aol.com>
To: <amsat-bb@AMSAT.Org>
Sent: Friday, 12 October 2001 14:34 UTC
Subject: [amsat-bb] Grid Dish and Helix Feed


> 1.  Has anyone replaced the linear dipole feed for a helix feed on the
26T2400 Conifer/Andrews bbq dish antenna? This grid antenna was once offered
by R Myers.  It's a 2.4 Ghz 22dB grid dish antenna, 2x3 feet.
>
> 2.  This is not an oval dish and does not use an offset feed.  It's
rectangular with a radius curve top and bottom.  Will W1GHZ's HDL_ANT
program work for finding focal point?
>
> 3.  Do helix feeds work on rectangular dishes?
>
> Thanks, ron n6paa
>
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