Re: [IRCA] Fwd: Topband: FCC Map of Ground Conductivity in US

[Nick Hall-Patch <nhp@xxxxxxxx>]

That one is quite up to date, Dennis, 1954.  Hard to tell what the 
one on the FCC site is, but I guess it's something that doesn't 
change much with time.

Note that the Alaska and Hawaii ones are labeled "assumed ground 
conductivities"

At 07:15 30-01-16, you wrote:
> https://en.wikipedia.org/wiki/Ground_conductivity#/media/File:United_States_Effective_Ground_Conductivity_Map.png
>
> Sent from my iPad
>
> > On Jan 29, 2016, at 11:05 PM, Bruce Portzer <bportzer@xxxxxxxxxxx> wrote:
> >
> > 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.
> >
> > _______________________________________________
> > IRCA mailing list
> > IRCA@xxxxxxxxxxxxxxxx
> > http://montreal.kotalampi.com/mailman/listinfo/irca
> >
> > Opinions expressed in messages on this mailing list are those of 
> the original contributors and do not necessarily reflect the 
> opinion of the IRCA, its editors, publishing staff, or officers
> >
> > For more information: http://www.ircaonline.org
> >
> > To Post a message: irca@xxxxxxxxxxxxxxxx
> >
> _______________________________________________
> IRCA mailing list
> IRCA@xxxxxxxxxxxxxxxx
> http://montreal.kotalampi.com/mailman/listinfo/irca
>
> Opinions expressed in messages on this mailing list are those of the 
> original contributors and do not necessarily reflect the opinion of 
> the IRCA, its editors, publishing staff, or officers
>
> For more information: http://www.ircaonline.org
>
> To Post a message: irca@xxxxxxxxxxxxxxxx


_______________________________________________
IRCA mailing list
IRCA@xxxxxxxxxxxxxxxx
http://montreal.kotalampi.com/mailman/listinfo/irca

Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers

For more information: http://www.ircaonline.org

To Post a message: irca@xxxxxxxxxxxxxxxx