[TowerTalk] Ground Conductivity - Was:Re: Inverted L for 160 meters

[Joe Giacobello]

I also had the same question.  I live in the same neck of the woods as 
Pete and I see a lot of iron pyrite (ferrous sulfide) glinting in the 
sun throughout my property and I have a lot of dissolved iron in my well 
water supply.  I assumed that the ground was loaded with it despite the 
two mS rating on the USGS map.

73, Joe

Pete Smith wrote:
> I wonder if anyone knows how much ground conductivity varies within the 
> broad contours shown on the USGS map?  For example, my area of West 
> Virginia is listed in the 2 millisiemen countour, probably because much of 
> the area is karst geology with only a narrow skin of soil over 
> limestone.  However, the area where my tower is footed is an ancient river 
> bed, with 6-7 feet of usually moist soil.  It seems (from experience only) 
> to be rather better than the general expectation of poor ground.  I presume 
> that the depth of soil needed depends in some large part on the skin depth 
> at the frequency of interest, but how far from a vertical antenna does soil 
> conductivity continue to affect field strength?
>
> 73, Pete N4ZR
>
> At 09:11 AM 10/19/2007, Ken Bessler wrote:
>
>   
>>> From: km1h at jeremy.mv.com
>>> To: jim at audiosystemsgroup.com; towertalk at contesting.com
>>> Date: Fri, 19 Oct 2007 08:57:45 -0400
>>> Subject: Re: [TowerTalk] Inverted L for 160 meters
>>>
>>>       
>>> A lot depends on the ground conductivity. With 32 radials 12' high I never
>>> waited in pileups very long. My ground conductivity is about that of 
>>>       
>> granite
>>     
>>> since it is only a foot or so below ground.
>>>
>>> Carl
>>> KM1H
>>>
>>>       
>> Incase any of you are wondering what the ground conductivity
>> is in your area, I have a map from the USGS showing just that
>> for the continental US. It is free to download at my website:
>>
>> http://members.cox.net/kg0wx/
>>
>> Ken
>>
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