Topband
[Top] [All Lists]

Re: Topband: Short radials?

To: "DAVID CUTHBERT" <telegrapher9@gmail.com>, "W2XJ" <w2xj@w2xj.net>
Subject: Re: Topband: Short radials?
From: "Tom W8JI" <w8ji@w8ji.com>
Reply-to: Tom W8JI <w8ji@w8ji.com>
Date: Thu, 27 Sep 2012 21:54:34 -0400
List-post: <topband@contesting.com">mailto:topband@contesting.com>
I am presently using a 30' base loaded vertical. The ground system consists of 90 radials from 12 to 25 feet. The base referred ground loss is 10 ohms.

The problem is we really can't measure ground loss at the base.

Let me give an example....

A 40 meter vertical here, 1/4 wave tall of fixed length.

Four elevated radials had less than 40 ohms feed resistance. About a dozen buried radials had around 60 ohms base resistance.

Field strength was identical despite the resistance difference with the same length resonant radiator.

Others have measured the same type of thing, and it is easy to duplicate results like this.

73 Tom

_______________________________________________
UR RST IS ... ... ..9 QSB QSB - hw? BK

<Prev in Thread] Current Thread [Next in Thread>