[TowerTalk] Soil Conductivity/

[Tom Rauch]

> The ARRL Antenna book has (or did have) the soil conductuctivity for the
> United States.   The conductivity near Atlanta is ZERO!!!!     Guess thats
> because the granite of Stone Mountain is at or near the surface. The
> conductivity is shown on a map with lines marking the values.

Conductivity varies all over the place in a short distance, in an area 
like Atlanta. You can find areas of less than 1, and areas of 15 
mS/m or more, measured on 1 MHz in the Atlanta area.  

You can't measure it with ground rods, you can only measure it by 
measuring the attenuation of a signal travelling along the earth.

I don't worry about ground conductivity, since I don't work a lot of 
extended groundwave on HF. I only worry about the first few 
wavelengths of distance from my antenna.


73, Tom W8JI
w8ji@contesting.com

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