Hey Phil, I saw that one too, but I thought it was well beyond the capabilities of the average poster out here. Thanks though.
I refereced the other link to show that ground resistance is frequency dependent. Your first link shows a way to measure conductivity at 60 Hz. My link includes measurement of the dielectric constant which also affects ground resistance and is frequency dependent. For example, the standard condition: "Very poor; cities, industrial" shows .001 mS/m with dielectric constant of 5. The standard condition: "Fresh Water" shows .001 mS/m with dielectric constant of 80. The difference works out to about a doubling of FS at a selected distance for Fresh Water vs. Very poor; cities, industrial.
Bottom line is that conductivity in mS/m is important, but the dielectric constant can have a significant effect when it is large vs. small.
That said, an excellent point was made in your reference that ground conductivity varied widely as the soil moisture content changed. The variation mentioned was between 15 and 30 mS/m. I think a similar variiation would be expected from the method I linked to. So a reasonable measurement by any method should ba taken as an average of readings taken over a long time, maybe going so far as a whole year to take into account seasonal variations.
So a reasonable measurement by any method should ba taken as an average of readings taken over a long time, maybe going so far as a whole year to take into account seasonal variations.
I agree.
Having a Ground Conductivity Meter on permanent hookup in the control room would be wonderful and taking daily readings a pleasure.
As someone who wanted to run 160 meter
AM, but never did, this is still very intriguing
to me.
Bruce, Mon. Stn., CT
As someone who wanted to run 160 meter AM, but never did, this is still very intriguing to me.
Many folks incorrectly think 160 meters is in the HF bands.
This is Ben Tongue's contribution, a simple meter to measure ground impedance. In this article Ben describes what it all means to you.
http://www.bentongue.com/xtalset/20MeaAGs/20MeaAGs.html