Re: Counterpoise question

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

Original poster: "Georg Sickinger by way of Terry Fritz <twftesla-at-uswest-dot-net>" <sickinger-at-web.de>

Hello Alan :o),

I donīt know something about counterpoises, but why donīt you make a twin coil.
The two coils are attached to each other at the points you use usually for
grounding and so no
grounding is required.
You can see one at Stefan Klugeīs homepage
http://hot-streamer-dot-com/stk/tc/sub4.htm

In hope of having helped

Georg

> Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>"
<yevaud_new.uk-at-excite.co.uk>
>
> Hi all -
>
> A recent post mentioned the use of a counterpoise. I'm in the middle of
> building a 1kW Tesla Coil and, when it is finished, have plans to
> demonstrate it to my physics students. However, finding a decent RF ground
> in the lecture theatre is not going to be easy so I was wondering whether I
> could get away with using a counterpoise ? Not having used one before, I
> hope you won't mind some pretty basic questions: Can I get away with using
> one at 1kW ?  If it is made out of aluminium foil spread out over the
> lecture theatre floor, how many square feet of it (roughly) would I need ?
> To what do you connect the other things that would usually be connected to
> the RF ground...NST core, safety gap etc....to the counterpoise as well ?
> Does the counterpoise really need to be connected to the mains ground as I
> think I read in one post or do you just leave it capacitatively coupled to
> the ground ?
>
> With thanks,
>
> Alan.
>
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