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Re: Topband: Monopole Elev Pattern w.r.t. Earth Conductivity

To: <topband@contesting.com>, <telegrapher9@gmail.com>
Subject: Re: Topband: Monopole Elev Pattern w.r.t. Earth Conductivity
From: "Tom W8JI" <w8ji@w8ji.com>
Reply-to: Tom W8JI <w8ji@w8ji.com>
Date: Wed, 24 Oct 2012 13:55:14 -0400
List-post: <topband@contesting.com">mailto:topband@contesting.com>
For DX we are interested in elevation angles from 3-15 degrees. How much error is there in a NEC model of a monopole at these elevations?

Dave WX7G

The issue here is one of measurement distance and the assumed flat earth, and how much the ground wave contributes to low angle radiation. We obviously know radiation at zero degrees is not zero, as distant models show.

I'm not sure anyone has actually measured wave angle of typical signals, or actually measured how much very low angle fields contribute to the low angle radiation.

Without measurements, we don't have solid theory. We have postulation, even if based on science.

73 Tom
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