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*To*: tesla-at-pupman-dot-com*Subject*: Re: 120 or 240 or 480 BPS??*From*: "Tesla list" <tesla-at-pupman-dot-com>*Date*: Sun, 04 Feb 2001 12:42:28 -0700*Resent-Date*: Sun, 4 Feb 2001 13:06:41 -0700*Resent-From*: tesla-at-pupman-dot-com*Resent-Message-ID*: <ooGSEB.A.e9E.NZbf6-at-poodle>*Resent-Sender*: tesla-request-at-pupman-dot-com

Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>" <FutureT-at-aol-dot-com> In a message dated 2/3/01 11:17:25 PM Eastern Standard Time, tesla-at-pupman-dot-com writes: > Original poster: "Bill Trumpet by way of Terry Fritz <twftesla-at-uswest-dot-net>" < > billtrumpet-at-hotmail-dot-com> > > Hello TCML, > > Would any of you be so kind as to explain to me the fundamental differences > in the BPS settings for SRSG's? What can I expect from the different break > rates? What rates are good for what type of XFMR? How do break rates > effect the cap values needed for best performance? Any and all tid-bits of > info appreciated. > > Thank you all, > > Bill Trumpet Bill, Basically, in the work I've done, the 120 bps is the most "efficient" at producing the longest sparks with a given amount of power input. NST's seem to strongly favor the use of 120 bps, but pole pigs, and PT's (potential xfrmers), can tolerate higher break rates better. For a given spark length and input power, lower break rates will need larger caps. This is because power input = cap energy in Joules X bps (not counting losses). A coil using a low bps will need a taller secondary because it will have larger "bang" size. It will also need a larger toroid, again to match the larger bang size. I did test comparisons of 120 vs 240 bps, and the 120 bps was 20% more "efficient" than 240 bps. The comparison was done by doubling the input power in two different ways. First by keeping the bang size the same and doubling the break rate. This gave a 20% spark length gain. Next I doubled the bang size but kept the break rate the same. This gave a 40% spark length gain. The sparks may look more frantic and fast moving at a high break rate, but this may not be noticeable if a breakout point is used on the toroid. Also, I think at higher break-rates, it makes less difference if the gap is synchronous or non-synchronous. More theory at: http://hometown.aol-dot-com/futuret/page3.html John Freau

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