Re: Resonant Frequency

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

Original poster: "Peter Lawrence by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Peter.Lawrence-at-Sun-dot-com>

Ed,
   here is my "armchair physicist's" take on this effect. In a 6" diameter
coil the points that are 19" apart along the length of wire (PI*6") are 
actually physically right next to each other. So as the signal is travelling
along the wire it induces that same signal 19" ahead (and to a lessor extent
38" ahead, and 57", etc). So the signal is getting way ahead of the "long
way" along the length of the wire by traveling across windings. So to me
the real question is not "why isn't it slower because of all the mutual
inductance and capacitance", but rather why is it only about 2 times faster
rather than _19_ times faster!
-Peter Lawrence.


>
>Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" 
<Esondrmn-at-aol-dot-com>
>
>I just read a comment from Paul Nicholson about the self resonant frequency 
>of a solenoid secondary being higher than the 1/4 wave frequency for the same 
>length of wire in free space.  I would have guessed it would have been lower 
>due to the added self capacitance of the solenoid secondary.  I just did some 
>calcs on my 6.0" secondary.  The self resonant frequency is 263 khz.  The 
>quarter wave frequency calculated for a 1604 foot long wire is 146 khz.  So 
>why does this come out backwards from what I expected?
>
>Ed Sonderman
>
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>