Re: The big bad Mark III

["Dan Kunkel" <dankunkel-at-hotmail-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Troy,

it sounds like your Mark III is pretty much identicle to the coil i am 
gathering parts for as we speak. i have the nsts (15kv -at- 120 ma), the pvc 
(6"), 23 awg magnet wire and i am going to order some mmc caps(2000vdc .068 
uf each--for a total of capacitance of .03 uf) through the current bulk buy 
here on the list.

i think i am going to use .25" tubing (flat spiral or maybe a 15 degree 
conical) for the primary. when i have more time (i am in college now) i will 
try the flat ribbon conductor primary you mentioned. one cheap alternative 
would be using aluminum roof flashing. the problem is cutting down the width 
to a workable size. an expensive solution would be going to a machine shop 
and have them cut you a piece. you could also try flattening tubing out with 
a hammer or use some heavy duty rollers (know anyone that has a steam 
roller?!) flat conductors should afford lowered RF resistance (though some 
coilers on this list are bound dissagree) as well as being compact as you 
mentioned. i had never thought about the corona problems...just use some 
fine grit sand paper to smooth the rough edges and see what happens.

what have you planned for spark gap?

dan
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