From: "Malcolm Watts"
Date: Tue, 24 Oct 2000 19:02:55 +1300
Subject: Re: [TSSP] The Q answer!?
I wasn't going to say anything before having sent a post about this (in addition to others I sent to the builder's list in the past), but........ On 23 Oct 00, at 19:00, Terrell W. Fritz wrote: > Hi All, > > I have figured out the Q problem. It's the Sonotube... > > I simply placed three bare coil forms (no wire) into the center of my > big secondary and measured the resulting Q. Picture at: > > http://63.225.104.49/TeslaCoils/Misc/PaulNich/SonoQ.jpg > > The bare coil has a Fo of 146.6kHz and a Q of 73.3 > > The first 21 x 6 x 1/4 inch plastic tube gave an Fo of 164.43 and a Q > of 66.5 > > The second 48 x 7.125 x 0.125 Sonotube gave an Fo of 144.79 and a Q of > 32.25!! Yes, that really is 1/2 ! > > The last 27 x 4.125 x 0.125 PVC tube gave an Fo of 146.6 and a Q of > 68.82. > > I have no idea what is in the Sonotube but paper and > wax/glue/plastic... but it is definitely high loss!! I knew it, I knew it, I knew it! I actually threw a coil away once because its terrible Q (about 40) almost prevented it from sparking. Regards, Malcolm
Maintainer Paul Nicholson, paul@abelian.demon.co.uk.