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