Re: RF grounding (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Wed, 20 Jun 2007 12:40:31 +0800
From: Peter Terren <pterren@xxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: RF grounding (fwd)

My 18 inch coil sits on my bitumen diveway and nearest earth is about 30 
feet (a wire fence).  In addition I use a 1 meter square aluminium plate as 
a centerpoise close to the coil which will also capacitatively couple to 
ground or spark to the bitumen directly if too much potential develops along 
the earth wire. For some of my interacting with a big TC stuff,  I need a 
very reliable TC earth that is not at too much potential to actual ground 
earth.  The pic below demonstrates this. My chain mail glove has 2 
independent TC earth wires but I am standing on the ground. (Only do this at 
home!)
http://tesladownunder.com/Tesla18HandNeon600.jpg
For some shots where the TC earth is distant, I stand on a grounded plate 
which is safer. eg
http://tesladownunder.com/Saurons%20Aura%20600.jpg
Of course a large body of water makes an excellent ground. So just hop in 
the pool!
http://tesladownunder.com/DiscoveryPool600.jpg
For my portable 4 inch coil on a trolley in the physics dept, I use a 
centerpoise of about 90cm square beneath the coil usually with the Faraday 
cage whch is mains earthed.
Peter http://tesladownunder.com

 > ---------- Forwarded message ----------
> Date: Wed, 20 Jun 2007 02:46:00 +0000
> From: Jeff Behary <jeff_behary@xxxxxxxxxxx>
> To: tesla@xxxxxxxxxx
> Subject: RE: RF grounding (fwd)
>
> Here in South Florida the only good grounds are the Atlantic Ocean and 
> Gulf
> of Mexico, and believe me the authorities get pissed when you ground Tesla
> Coils to them!
>
> For small coils, and this probably isn't the best logic, I made a large
> "sort-of-rolled cap" with only one metal conductor and some plastic
> dielectric.  The result is just a large surface area of metal insulated 
> from
> itself, like a large "capacity" but not a "capacitor".  I use it for 
> indoor
> demos where grounding of small units isn't always convenient.  I'm sure 
> its
> not the best thing to do, but it seems to be better than nothing in a 
> pinch.
>  I've also tried this arrangement for smaller bipolar cylinder coils
> (separately wound) under oil, where I didn't want to drill any holes in 
> the
> bottom of a container to run a ground wire (and probably eventually oil on
> the floor)...
>
> Its probably the equivalent of using the VW bus in the last example but
> forgetting to bury it...?
>
> Jeff Behary, c/o
> The Turn Of The Century Electrotherapy Museum
> http://www.electrotherapymuseum.com
>
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