Re: Quarter Wavelength Frequency

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: robert heidlebaugh <rheidlebaugh-at-desertgate-dot-com> 

Paul: In communications you can use 1/4 wavelength tuned stub or you can use
tunned coils and tapped connections to match the same preformance. I have
used 1/4 wave stubs coiled to reduce size with good results and no tapped
connections required for impedance matching with ideal SWR. The thought of
trieng that in tesla coils could be a interesting study. I guess the
physical size would be more than most of us would try.
      Robert   H
-- 


 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > Date: Mon, 05 Jul 2004 18:12:13 -0600
 > To: tesla-at-pupman-dot-com
 > Subject: Re: Quarter Wavelength Frequency
 > Resent-From: tesla-at-pupman-dot-com
 > Resent-Date: Mon, 5 Jul 2004 18:17:34 -0600
 >
 > Original poster: Paul Nicholson <paul-at-abelian.demon.co.uk>
 >
 > Jared E Dwarshuis wrote:
 >
 >> When we match the L.C. frequency to the wire length frequency
 >> we believe that it minimizes interference between the two
 >> distinct resonant energy storing mechanisms.
 >
 > This isn't very clear - could you say what you mean by 'two distinct
 > resonant energy storing mechanisms'?
 >
 >> Clearly L.C. resonance occurs in systems that ignore wire length
 >> (such as the primary inductor), but when the wire length is also
 >> considered in design, the dynamics change.
 >
 > We're getting the impression that you're treating 'wire length
 > resonance' and 'LC resonance' as two different physical resonant
 > behaviours, rather than simply alternative descriptions of the
 > same phenomena.
 >
 > I looked on your website for comparisons of measured resonant
 > frequency against the prediction light_speed/wire_length, but
 > could not find anything.  We would not expect the velocity
 > factor 'along the wire' of the toroidal coil to be unity,
 > which your web site notes seem to take as an assumption.
 >
 > Or is it that you are *selecting* coils which happen to
 > have unity velocity factor, in order to achieve some
 > special effect?   Please clarify.
 >
 > It would be interesting to know what the measured velocity factor
 > is, for each resonant mode.  Absence of end effects simplifies
 > things but there should still be a fair amount of dispersion.
 >
 > Please give us details of the mode spectrum of your test
 > coil.  It should not be qualitatively different from a short-
 > circuited straight solenoid.
 > --
 > Paul Nicholson
 > --
 >
 >