[TowerTalk] Measuring RF ground characteristics

[Artek Manuals]

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 at hornucopia.com)
>
> ----- Original Message -----
> From: "Artek Manuals" <Manuals at ArtekManuals.com>
> To: towertalk at 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 at 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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-- 
Dave Manuals at ArtekManuals.com www.ArtekManuals.com

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