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Re: S Band Helix



The inherent broadbandedness of the Helix design greatly mitigates this effect.

John W9EN

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Message: 6
Date: Wed, 15 Jun 2005 23:40:15 -0400
From: "Woody" <kj4so@nc.rr.com>
Subject: Re: [amsat-bb] S Band Helix

Hi Robert:

PVC is a dielectric and when placed in close proximity to an antenna, 
will lower the resonant frequency of the antenna, compared to the same 
antenna without any type of raydome or enclosure.  This effect is due to 
the lowered VOP (velocity of propagation) of the PVC.

PVC makes a good Raydome for a 2.4 GHz. antenna, you just need to 
compensate for the lowered resonant frequency of the antenna.

73,

Woody
KJ4SO
AMSAT # 5562
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