[BC] ground conductivity map of the U.S?

[Mark Humphrey]

Official M3 map from the FCC website:

http://www.fcc.gov/mb/audio/m3/index.html

Easier to read:

http://www.access.gpo.gov/ecfr/graphics/pdfs/ec01mr91.075.pdf

However, the values shown are often optimistic.  For example, in
upstate New York, the predicted values are somewhat valid this time of
year when the ground is frozen hard, but in the summer, conductivity
usually drops to less than half.

Mark

On Fri, Feb 19, 2010 at 11:04 AM, Timothy West <n3drb at comcast.net> wrote:
> anyone know of one that shows typical ground resistance/conduction
> quality in various areas of the country?
>
> maybe even a pdf download?
>