From: boris petkovic
Date: Fri, 29 Dec 2000 05:18:39 -0800 (PST)
Subject: Re: [TSSP] early idle testing
> Boris wrote: > > ---- > > By resonance frequency you consider the exact > > frequency where input impedance of the resonance > > reaches its minimum? > > ----- > > No. Minumum Zin is slightly below resonance. The > resonance > is where peak top volts occurs, which is where the > phase > crosses 90 deg. ---- (glad we got straight this out) Actually,this is the most valuable information from you I got so far. It directly puts light on my work about resonator behaviour I conducted about year ago. (and these were exhausting 3 weeks of thinking,mathematizing and pondering over treating that thing) I recall that I got ,at one stage,by employing the method of exponential asyimptotics with a small exponent ,CW result which seemed to converge to phase shift slightly different than 90 degrees when top voltage hits its maxima. It depended on Q in merely the same way like in lumped RLC resonant theory ,where is well known that voltage on capacitor doesn't reach maximum at angular frequency w=1/sqrt(LC) ,but at something different than that. But ,since many told me they used Zin=min measurment to tune they coils ,and I used not so reliable math. aproximation method ,I thoughI should better tear down to pieces this and forget whole thing. After all,I was mostly intersted then in transient processes ,not CW state. ---- > > I thought a little more about your comment of a > persistent > phase other than 90 deg at resonance. You may well > get that > if you are driving through a primary winding rather > than > into the base. > ----- Yes,I tend to agree with you here. Regards, Boris __________________________________________________ Do You Yahoo!? Yahoo! Shopping - Thousands of Stores. Millions of Products. http://shopping.yahoo.com/
Maintainer Paul Nicholson, paul@abelian.demon.co.uk.