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

[Russ Edmunds <wb2bjh@xxxxxxxxx>]

Ground conductivity should remain reasonably constant with the exception of
changes caused by severe or massive grological or weather events, so I
wouldn't expect to see much difference.

Russ Edmunds
15 mi NW Phila
Grid FN20id
<wb2bjh@xxxxxxxxx>

AM: Modified Sony ICF2010's (2) barefoot w/whip
FM: Yamaha T-80 & T-85, each w/ Conrad RDS Decoder;
Onkyo T-450RDS; Tecsun PL-310 ( 2);
modified Sony ICF2010 w/APS9B @ 15';
Grundig G8 w/whip; modified Sony ICF2010 w/whip


On Sat, Jan 30, 2016 at 2:27 AM, Nick Hall-Patch <nhp@xxxxxxxx> wrote:

> 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.
>> >
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