Grounds are likely not uniform in the horizontal dimension either, nor in
the time dimension. One would have to do very difficult and granular
measurements of small cubes of soil and then build a highly computationally
complex model even given accurate measurements.
73 John N5CQ
-----Original Message-----
From: TowerTalk <towertalk-bounces@contesting.com> On Behalf Of Richard
(Rick) Karlquist
Sent: Saturday, February 13, 2021 12:57 PM
To: Artek Manuals <Manuals@ArtekManuals.com>; towertalk@contesting.com
Subject: Re: [TowerTalk] Measuring RF ground characteristics
Just a heads up:
Gerry Burke, of LLL/NEC fame had some discouraging news about their ground
measurements. He told me that in some cases there was no configuration of
NEC parameters that would correlate with some real life ground measurements.
The other disclaimer is that NEC only models a uniform ground.
I know my ground is far from that. After 1 to 5 feet of pure clay, I hit
"cemented hardpan" waterproof clay. About 40 feet down I hit sand,
according to the well diggers. No way to model that with NEC.
Rick N6RK
On 2/13/2021 9:59 AM, Artek Manuals wrote:
>
> HF Ground Measurements at the Lawrence Livermore National Laboratory
> Field Site; /Applied Computational Electromagnetic's Society Journal
> and News Letter, Vol. 3,Number 2, Fall 1988"
> /
> Any help appreciated with either a copy of the paper or a pointer to
> where it might be downloaded. So far Google has not been my friend./
>
> Dave
> NR1DX
> manuals@artekmanuals.com
> /
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