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Re: Topband: Ground Screens - Another Small Space Option

To: "Paul Christensen" <w9ac@arrl.net>, <topband@contesting.com>
Subject: Re: Topband: Ground Screens - Another Small Space Option
From: "ZR" <zr@jeremy.mv.com>
Date: Wed, 26 Sep 2012 09:29:27 -0400
List-post: <topband@contesting.com">mailto:topband@contesting.com>


I've used screens when I needed a wide bandwidth ground system, but never
under other conditions.

Adding a screen or preferably, additional short radials at the base will assist in stabilizing the resistance component of the vertical radiator and capacitance across the base insulator as ground conditions change due to wx, seasonal ground moisture, etc. The stabilization effect is probably more important with directional systems than it is for non-directional radiators and is common in AM broadcast systems where an array is sited in a flood plane.

Paul, W9AC


A screen will result in much stronger radiated power where it is wanted if the antenna of any height is over poor ground.

Carl
KM1H
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