From: Paul
Date: Wed, 27 Dec 2000 16:46:23 +0000
Subject: Re: [TSSP] early idle testing
Boris wrote: > Have you ever measured phase shifts between sine wave > voltages of the signal generator and the wave of the > top of a high Q coil driven in Fo CW mode? > What tssp CW simultor can say about these shifts? Exactly at Fo, the base drive voltage is in phase with the base current, which in turn is 90 deg from the top voltage, so the top voltage is 90 deg out of phase with the base voltage. This phase difference continues for a short distance into the coil before the uniform-phase voltage distribution of the free resonance takes over. A rapid phase change takes place within that short distance, the distance being roughly a fraction 1/sqrt(Q) of the coil length. Use of high Q secondaries means that I can ignore this artifact of the base drive and assume, for the purposes of calculating equivalent reactances, that the uniform phase of the free resonance still applies to a good approximation. Regards, -- Paul Nicholson, Manchester, UK. --
Maintainer Paul Nicholson, paul@abelian.demon.co.uk.