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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,  
Gary.Lau@xxxxxx writes:

>Perhaps the results may depend upon how close the primary coil is  to the 
secondary base, 
>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 
extraneous arcing.

>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 
>just fine".

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 
worry about!
-Phil LaBudde
Center for the Advanced Study of Ballistic  Improbabilities

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