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

[Dennis Gibson <wb6tnb@xxxxxxxxx>]

Don't forget WNAX-570. Notice the conductivity over seawater is assumed to be 5,000. Here's another map:

http://www.radio-timetraveller.blogspot.com

The pattern reference there is quite interesting. 

Sent from my iPhone

> On Jan 30, 2016, at 5:16 AM, Rick Dau <drummer1965us@xxxxxxxxxxx> wrote:
> 
> That's the same map that I have on the bulletin board in my DX "shack".  The highest number, 30, represents the regions where the best ground conductivity in the U.S. can be found, then 15 for next best, then 8 for next best after that, and it goes down from there.  NOW you see why KFYR-550 and KFGO-790 get out so well in the daytime?   There's your answer.  :)
> 
> This map appeared in the 1980 NRC Nighttime Pattern Book, a copy of which I had in my possession once upon a time and am trying to acquire again (for nostalgic purposes).
> 
> 73,
> Rick Dau
> South Omaha, Nebraska EN21af
> Http://www.dxworld.com/bcblog.html
> 
> ________________________________________
> From: IRCA <irca-bounces@xxxxxxxxxxxxxxxx> on behalf of Dennis Gibson <wb6tnb@xxxxxxxxx>
> Sent: Saturday, January 30, 2016 1:15:23 AM
> To: Mailing list for the International Radio Club of America
> Subject: Re: [IRCA] Fwd: Topband: FCC Map of Ground Conductivity in US
> 
> 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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