From: "Terrell W. Fritz"
Date: Mon, 23 Oct 2000 19:00:38 -0600
Subject: [TSSP] The Q answer!?
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!! Cheers, Terry
Maintainer Paul Nicholson, paul@abelian.demon.co.uk.