Re: NEC-LIST: Ground Constants at 1.161 kHz for "Good" Ground

George,

Is this a realistic value of epsilon r (3477) the only material I know
that approaches this value is a piezoelectric ceramic. Water itself
only has a value of 80. Do I understand the frequency is 1.161kHz or
1.161MHz

At 01:10 PM 7/26/99 -0400, you wrote:
>
>I ran my "Longmire and Smith" ground constants model for their
>standard case (epsilon r equals 5.0 at infinity), and I iterated on
>moisture content (by volume, in g/cc) to find a match at 1.161 kHz and
>a conductivity of 15 mS/m. I got a value of mv = 0.145 g/cc, and
>corresponding values of epsilon r of 3477.5 and dissipation factor
>(AKA loss tangent) of 67.1. The complex relative permittivity,
>assuming e to + j omega t, is:
>
>epsilon r complex = 3477.5 -j233476.3
>
>So you did get really good ground, but your value of 30 for epsilon r
>(relative dielectric constant) is way too low. But since the loss
>tangent is about 67, with sigma greater than omega epsilon, the
>epsilon r value difference probably wont affect your results or
>conclusions.

Paul Record
SEA MAMMAL RESEARCH UNIT
Gatty Marine Laboratory
University of St.Andrews
St. Andrews
FIFE KY16 8LB
Tel: 0044 1334 462630 Direct: 0044 1334 463628
Fax: 0044 1334 462632
SMRU web site http://smub.st-andrews.ac.uk
email : p.record_at_smru.ac.uk
Received on Mon Aug 02 1999 - 17:32:27 EDT