From: Paul
Date: Fri, 27 Oct 2000 08:37:37 +0100
Subject: Re: [TSSP] Sonotube losses
Terry, On 2nd Sept you supplied some Q measurements, Terry wrote: > Bare Coil > f1 = 148.3kHz Q = 57.7 > f3 = 347.87kHz Q = 33.3 > f5 = 513.76kHz Q = 20.3 and you mentioned that if the coil was put up on a plastic bucket the Q went up to 75. I'm trying to decide whether the steep drop in Q factor at the higher frequencies which you measured above was due to eddy losses or to sonotube loss. If the simulator is let loose with a fixed E-field loss factor (of 0.0139) the expected Q factors and Zin are f1 713 ohms, Q 69 f3 990 ohms, Q 127 f5 950 ohms, Q 187 I wonder if, when clear of the ground plane, your Q follows the original falling trend, or the rising trend predicted on the basis of a constant loss with frequency? Of course, the answer may be both - eddy losses in the tube! Cheers, -- Paul Nicholson, Manchester, UK. --
Maintainer Paul Nicholson, paul@abelian.demon.co.uk.