Re: BIG counterpoise

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>

 >From an E field standpoint, the radius of the counterpoise should be
comparable to the height of the topload above the counterpoise.  As the
counterpoise gets bigger you get less and less benefit for the amount of
area involved.  One could work a calculation and trade off counterpoise area
against coupling to ground underneath it.

If you run the field mapping program from Terry, you can get an intuitive
feel for where "most" of the field is.

http://hot-streamer-dot-com/andrewb/models/models.htm

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, December 08, 2002 10:06 AM
Subject: BIG counterpoise


 > Original poster: "Gregory Peters by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <s371034-at-student.uq.edu.au>
 >
 > Hello all,
 >
 > Where I live, the ground is pretty much solid metamorphic rocks,
 > Devonian/Carboniferous phyllite to be exact. My house is cut into a
 > hill, so there is probably only a foot of topsoil at most. Also, the
 > rock is fresh and not weathered at all. I don't think even Dan could
 > hammer through that. :^) I'm wondering if anyone has successfully
 > used a counterpoise on a large (10kW) coil? If so, how big should it
 > be? Previously, my ground has been many small rods (1 foot long)
 > hooked in parallel, as I just can't get through the stuff.
 >
 >
 > Cheers,
 >
 > Greg.
 >
 >