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

[jeremy-ca]

Has anybody ever wondered about those sweet spots while driving around and 
listening on the AM band?

Im talking about those spots where the complete band comes alive and not 
just one station. No HV power lines or salt water in sight.

Carl
KM1H


----- Original Message ----- 
From: "Pete Smith" <n4zr at contesting.com>
To: "Ken Bessler" <kg0wx at hotmail.com>; <towertalk at contesting.com>
Sent: Friday, October 19, 2007 12:56 PM
Subject: [TowerTalk] Ground Conductivity - Was:Re: Inverted L for 160 meters


>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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