Re: 1/4 wave theory/cite the variance?

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

Original poster: "Ed Phillips by way of Terry Fritz <twftesla-at-qwest-dot-net>" <evp-at-pacbell-dot-net>

Tesla list wrote:
> 
> Original poster: "davep by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<davep-at-quik-dot-com>
> 
> > > >> The 1/4 wave resonant frequency of a wire, when wound into a
> > > >> solenoid, is typically more than 50% higher than that of the
> > > >> straight line value.
> 
> >         What do you mean by the "quarter wave frequency of a solenoid?
> 
>         One infers it is the freq at which the thing goes 1/4 wave
>         resonance.  relatively easily determined.  First (and lowest)
>         of the self resonant modes.

	Lowest of the self-resonant modes is clear enough.  For an isolated
wire that occurs at a length of a half wavelength, and for a grounded
vertical wire at a quarter wavelength, due to fact that there's an image
antenna below the ground.  If I remember my mechanics, you could
substite isolated bar and clamped bar.

Ed