Nick
I'm not sure where the data came from but it goes back a few years. I
have a similar FCC map dated 1938.
Bruce
On 1/29/2016 9:53 PM, Nick Hall-Patch wrote:
Just in case you have a wall that is bare and just begging for nerdish
covering, behold, the FCC offers a printable 43x69-inch map (in many
sheets) of ground conductivity in the US (info from Topband Reflector;
see below). There is also a text file of ground conductivities for
the western hemisphere, including such hot beds of DX as Gabriola
Island and Mayne Island. I haven't quite figured out what all the
numbers and locations mean however, or where the data originates.
Does anyone know?
best wishes,
Nick
From:
http://www.radiomagonline.com/fcc/0019/fcc-reveals-m3-map-of-ground-conductivity-in-us/37366
[1]
FCC M3 Map of Ground Conductivity in US
Commission offering printable 43x69-inch map
January 28, 2016
The map shows that ground conductivity across the U.S. ranges
from
0.5 to 30 millimhos (or millisiemens) per meter. The FCC also reports
that the conductivity of seawater is 5,000 millimhos per meter.
The downloadable map comes in 48 portions that can be printed.
https://www.fcc.gov/media/radio/m3-ground-conductivity-map [2]
The FCC is also offering the conductivity data as text files
and also
includes data for the Chesapeake Bay and Puget Sound, which is not
shown on the printable map.
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