From: Paul
Date: Sun, 29 Oct 2000 14:48:21 +0000
Subject: Re: [TSSP] NSVPI - Latter Results
Malcolm wrote [referring to the sonotube loss discovery]: > That is an encouraging find. I think it lends some credence to > the kinds of Q's I was measuring on both the PVC and HDPE > coils. It means that very good coils can easily be built. Malcolm, I don't think there's any doubt that the kind of Q factors that you were measuring are typical, my coil(s) too give a Q in the several hundreds. Terry's big LTR is unusually lossy but the noteable point is that it does not really hamper performance in the disruptive system. My guess is that if an identical coil but with a high Q was substituted, the performance would only be a few percent higher. Hopefully in the not too distant future we'll be able to take a close look at the coupling process in the time domain, and then we'll be able to say precisely how much a low Q impinges on system performance. > I enjoyed reading your pn1310 (?) paper. The arguments > look prima facie reasonable to me and the fact that they fit a > measured profile is most encouraging. Yes it is, and thanks for taking a look at pn1310. I don't think it contains anything controversial, its just a few statements and definitions which stick closely to basic charge and energy conservation. > I am enjoying participating in a group which is putting > some real science into the "art" of coiling. Yes, me too. It's a bit of a contrast with wider coiling community, there's plenty of confused ideas and some quite gross misinformation circulating around out there! I've not come across a branch of electrical engineering that has this much mythology built up around it - it's as if rationality survives up to around the primary coil, but beyond that folk often seem to forget that the laws of physics still apply. > It is nice to think that at the end of the various threads of > investigation a coil will be designable to a specification. Once the current flurry of software changes have gone through and been bedded down, there's a good chance we can set about a distributed computing effort to explore the configuration space to find optimum systems. Then we'll know what spec to design to! Regards, -- Paul Nicholson, Manchester, UK. --
Maintainer Paul Nicholson, paul@abelian.demon.co.uk.