Bruce
I now have the paper which unfortunately at first glance appears to be
missing the math that converts the "readings" from the OWL probe to
conductance and dielectric constant that NEC wants plugged in.....
Dave
NR1DX
On 2/13/2021 4:03 PM, Bruce Horn wrote:
Hi Dave,
I accessed Jim's 2nd link without an account. It had a link to the actual paper
(looks like the one you were interested in) that can be accessed without an
account.
73 de Bruce, WA7BNM (bhorn@hornucopia.com)
----- Original Message -----
From: "Artek Manuals" <Manuals@ArtekManuals.com>
To: towertalk@contesting.com
Sent: Saturday, February 13, 2021 1:00:53 PM
Subject: Re: [TowerTalk] Measuring RF ground characteristics
Jim
Thanks , I wonder why google wouldn't return that. It looks like it
might be there.
Unfortunately you have to"apply" for an account, And it asks (
unnecessarily IMO ) for a lot of personal info. I choked that down and
applied we will see if they let me in ...so far no reply
Dave
NR1DX
On 2/13/2021 1:03 PM, Lux, Jim wrote:
On 2/13/21 9:59 AM, Artek Manuals wrote:
In the process of trying to correlate actual measured R+jX values vs
NEC models for an 80M inverted L with elevated radials, I was
directed to a paper by Rudy N6LF in QEX from 2009. I have used Rudy's
approach and have after many iterations achieved reasonable
correlation between actual and modeled numbers. The numbers were not
what I expected but are "believable"
It would be intellectually far more satisfying to be able to measure
conductivity and dielectric values through direct means.The ARRL
Antenna Handbook ( 22nd edition , page 3-21) references some work
done by George Hagan back in the 1980's using probes and a VNA. . The
ARRL in its infinite wisdom of course does not show the math involved
in using this method to directly measure and calculate conductivity
and dielectric constant. I have "probes" and a decent VNA ( AIM4300)
I am looking for a copy of:
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
/
ACES website?
https://aces-society.org/newsletter.php
or maybe here...
https://aces-society.org/search.php?vol=3&no=2&type=2
check about 1/3 way down - a paper by Hagn
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