Re: [TCML] Grounding rods

[Don Murray <don@xxxxxxxxxxxxxxx>]

Gary,

The way we tested grounds at the utility, for capacitor banks and also 
grounds every thousand feet under the main line and at the end of 
laterals on star systems,  was with the Vibroground. They had to be 3.5 
ohms or less. We would couple 8 foot ground rods together with threaded 
couplings. We would drive as many as 6 on top of each other with an 
eighty pound jackhammer. If we still didn't get 3.5 ohms, we would move 
out 6 feet and drive more. We would tie them together with #6 solid 
copper.  I  have no affiliation with this auction, but here is an ebay 
listing with a short description. There are others for sale as well.

http://cgi.ebay.com/Associated-Research-Vibroground-Model-293A-Voltage_W0QQitemZ320296758778QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item4a932cadfa&_trksid=p3286.m20.l1116

Don Murray

Lau, Gary wrote:

> The short answer is, no, I haven't tried using a chemical ground.
>
> The problem is, I'm unaware of any means to gauge the "goodness" of a ground system.  The truth is, the spark performance of a Tesla coil is relatively (maybe completely) unaffected by the quality of an RF ground system.  What IS affected is the degree to which RF and HV transients are coupled into one's mains wiring, but again, I'm unaware of any means to measure or compare mains corruption.
>
> If you can detect a performance difference with different grounds in receiving VLF radio, you may be able to teach us something!
>
> Regards, Gary Lau
> MA, USA
>
>  
>
> > -----Original Message-----
> > From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> > Behalf Of Mike Thompson
> > Sent: Friday, July 24, 2009 2:03 PM
> > To: Tesla Coil Mailing List
> > Subject: [TCML] Grounding rods
> >
> > Hello All,
> >
> >  I was wondering if anyone had played with a chemicle ground in the past. This is
> > basically a copper pipe with holes drilled in it and then hammered into the ground.
> > At that point brine solution is poured into the pipe to "activate" it. I have played with
> > these in the past regarding ground antennas and have had decent success and
> > was wondering if anyone had use one for a Tesla Coil ground.
> >
> >  I am currently keep a small blog on my progress with building a Tesla Coil if
> > anyone is interested in seeing the ground rod I am proposing to use.
> >
> > http://z0rb.livejournal.com/tag/teslacoil
> >
> > Thanks
> > Mike T.
> >
> > Homepage
> > http://home.comcast.net/~mikethompson236/index.htm
> >    
>
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>  

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