Re: [IRCA] was: Measuring D-C resistance of ground rods to earth

["Chuck Hutton" <charlesh3@xxxxxxx>]

CAT:

You can use the methods I mentioned regardless of frequency (60 Hz, MW,
etc). It's up to you to provide the proper generator.

I use this: http://www.beecavewoods.com/testequipment/sinewave.html . I like
it because it's simple, parts are readily accessible, and best of all it
puts out enough RF so that I don't have to worry about bad readings due to
strong local MW signals. (Or so I hope.....)


Chuck

-----Original Message-----
From: irca-bounces@xxxxxxxxxxxxxxxx [mailto:irca-bounces@xxxxxxxxxxxxxxxx]
On Behalf Of Charles A Taylor
Sent: Saturday, July 14, 2007 7:29 AM
To: Mailing list for the International Radio Club of America
Subject: [IRCA] was: Measuring D-C resistance of ground rods to earth

At 10:30 PM 7/13/2007 -0700, you wrote:
>Charles:
>
>You might want to do a Google for "three point method" and "fall of
>potential". These are the two standard methods for measuring grounding
>resistance. You should easily find tutorials from manufacturers of testing
>equipment.
>
>EWE's are at or near the top of the list of antennas that are picky about
>having a good ground. Were it my EWE, I'd follow standard RF grounding
>practice and put it at least 3 8' ground rods separated by at least 5 feet.
>With average soil or better, that should suffice. With poor ground, buy a
>silver mine and install it under the antenna.

Chuck,

See my short-short reply to Larry Helms about this.

I do want to try a metallic return and have enough wire on hand, and
mean to try the concept...but not now because I have more urgent
matters to tend.

Anyway, the metallic return wouldn't be practical for a long EWE
Mine is only 65 feet long.

And even if I use the "fall of potential" method, it doesn't
answer the question of the TRUE R-F RESISTANCE.

Fall of potential is used by electric utilities, so I've looked it
up before.

The whole idea is that the far end termination may be possibly
done by the inherent resistance of the wire.

Thanks for you ideas.

Chaz


   Charles A Taylor, WD4INP
  Greenville, North Carolina 


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