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*To*: tesla-at-pupman-dot-com*Subject*: Re: Keeping up with the theory (was is Corum and Corumforbidden topic?)*From*: "Tesla list" <tesla-at-pupman-dot-com>*Date*: Mon, 06 May 2002 21:03:47 -0600*Resent-Date*: Tue, 7 May 2002 00:19:24 -0600*Resent-From*: tesla-at-pupman-dot-com*Resent-Message-ID*: <qFlzID.A.oQD.qH318-at-poodle>*Resent-Sender*: tesla-request-at-pupman-dot-com

Original poster: "rob by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rob-at-pythonemproject-dot-com> Tesla list wrote: > > Original poster: "Ray von Postel by way of Terry Fritz <twftesla-at-qwest-dot-net>" <vonpostel-at-prodigy-dot-net> > > Ed: > Thanks for the information on the availability of programs.....even expensive > ones. My > comments were based on the method of computation using empirical equations > rather > than those that are general in nature. Why use approximations if there are > better methods? > > Rob: > Are you saying that the equations currently being used for distributed > capacitance yield > accurate and precise results and are based on Maxwell's equations? If that is > the case, > then why bother with Wheeler et al? I'm losing track of what I said and when :) I think I said that the lumped approximations seem to be working for people. But there are extremely expensive programs that fully simulate a coil or systems of coupled coils, and output multiport S-parameters. Now there is a free program called Fastcap. Evidently it works on geometric description files like Fasthenry. I have it on my computer, but I haven't gotten there yet. I did make my first Fasthenry Berekely spice model, but having PSpice, I have to figure out what to do with it. Maybe use SpiceOpus. > > No one, so far, has convinced me that a project to come up with a general > equation > for the calculation of parasitic capacitance of a solenoid would not be worth > while. The > limitation on precision and accuracy should be the ability to readily measure > dimensions > and not on the math. Any such equation, set of equations, or procedure should > be usable > by any one on the list who has a computer. Why any one building a coil would > want to do so is beyond me. It seems to be a mountain that is there and has > not been climbed. I agree, but then I'm biased, and most people just like experimenting. But there is a thrill that comes when a model turns out to work in real life. Rob. -- ----------------------------- The Numeric Python EM Project www.pythonemproject-dot-com

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