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RE: I've lost my k. Can someone help me find it?
Original poster: "Lau, Gary by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Gary.Lau-at-hp-dot-com>
THANK YOU (please pardon my shouting) for performing and reporting on such
a detailed experiment. The alleged coupling "sweet spots" have long been
suggested to theoretically be significant, but it's also been my
observation that performance simply increases with increasing k until
racing arcs occur. Time to retire this to the "coiling myths" graveyard.
Hey, there's an idea for a useful web page!
Regards, Gary Lau
>Original poster: "Daniel Barrett by way of Terry Fritz
> Hi List-
> Thanks to everyone who helped me find my K. I spent about 3 hours with
>my single-MOT coil today constructing an arrangement to vary my secondary
>height. I carefully measured K12 at each 1/8" interval beginning with the
>bottom turn of secondary 1/2 inch below the primary plane, all the way up to
>4" above. Armed with this spiffy spreadsheet we went out to the backyard to
>play. After trying all the variations I came to the following conclusion:
> "It just doesn't freekin' matter."
> I don't see any sweet spots, nulls or anything exciting at all. Arc
>length appears to be proportional to K until it gets so high that racing
>arcs occur and corrona starts coming out of all the bits it isn't supposed
> I get arcs about 60 inches (at 1.4kW) with k at about .19 and racing
>sparks above about .21. My observations suggest that K is not something
>worth tweaking, at least not as important as detuning to compensate for
>streamer loading, spark gap, etc.
>Is this consistant with what others are seeing?
>Does it become more critical at higher power levels or other conditions?