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Re: [TCML] RF Ground and Brass
In a message dated 3/6/08 1:09:13 P.M. Eastern Standard Time,
>Perhaps the results may depend upon how close the primary coil is to the
>determining whether or not there would be arcing there. It does seem a
little hard to swallow that
>disconnecting the base would show NO difference in performance and no
>There is a capacitive path between the secondary base and the primary. If
there is a poor direct
>path from the secondary base to RF ground, the capacitive path to the
primary, NST, and ultimately
>to the mains will be used. The quality of one's RF ground is a continuum;
if one has a "perfect"
>ground connection to the secondary base, then there would be no current in
the capacitive path. If
>one has a "pretty good" RF ground, the secondary base voltage will still be
non-zero and there will
>be some capacitive coupling to the primary, NST, and mains. The worse the
quality of the RF
>ground, the more coupling will occur to the primary and out to the mains.
>Unfortunately, no one has devised a means of quantifying how much RF gets
coupled into the
>mains, so everyone (myself included) simply reports "I use X ground rods
and Y cable and it works
I agree 100% with your statements!
>You have inspired me to do some experiments. With my 4/20 NST-powered mini
coil, I'll try various
>secondary base connections, ranging from no connection (if it doesn't arc),
to a long and lazy piece
>of #42AWG lying insulated above the basement floor, to a copper ribbon tied
to the water main in my
>basement. I'll report maximum spark length; unfortunately I have no means
to gauge mains hash.
>This will be interesting - I don't recall ever hearing of such an
Again, I agree! The results would be a valuable addition to the data
already on your Website.
And if you find #42 works fine, it's one less thing for all of us to
Center for the Advanced Study of Ballistic Improbabilities
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