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Re: An Important Post.
From: Greg Leyh[SMTP:lod-at-pacbell-dot-net]
Sent: Wednesday, August 06, 1997 2:14 PM
To: Tesla List
Subject: Re: An Important Post.
Richard Wayne Wall wrote:
> >Apparatus: A seven stage line was built as follows:
> >
> > 1.6mH 800uH 400uH 200uH 100uH 50uH 25uH
> > ----oooo--+--oooo--+--oooo--+--oooo--+--oooo--+--oooo--+--oooo--+---
> > In | | | | | | | Out
> > --- --- --- --- --- --- ---
> > --- --- --- --- --- --- ---
> > Gnd | | | | | | |
> > ----------+--------+--------+--------+--------+--------+--------+---
> > 10pF 22pF 50pF 100pF 220pF 470pF 1000pF
> >
> Malcolm,
>
> Placing matching inductors in the opposite bottom "slots" of the ground
> line allows a truer representation of a transmission line. The ground
> line can be entirely eliminated.
That might be true for a _balanced_ xmsn line, such as the twin-lead
antenna cable on your TV, but is definitely _not_ true for a TC secondary,
which is at best an unbalanced and heavily tapered xmsn line.
> Eric Dollard did this with his "analog computer" representation
> of a transmission line. Only Eric used repeating units of the same
> valued inductors and capacitors. More like a real wound resonator.
But real TC resonators don't actually have repeating values for the
capacitors, since the distances to the ground plane along the coil
vary considerably. Also, a standard TC has a much larger capacitance
at the top end, due to the toroid. Therefore, if the secondary is to
be modeled as an xmsn line, the cap values in the model must necessarily
ramp upwards or downwards, to reflect the real world considerations.
-GL
> Eric measured magnetic and ES components and their effects along the
> various segments from one end to the other and contrasted them with
> predicted transmission line values at quarter wave resonance. There
> was marked disagreement. Orthodox transmission line theory assumes
> transverse propagation of an EM wave. Eric's model demonstrates
> longitudnal transmission of an electrical wave. Longitudnal
> transmission - a theory near and dear to Nikola Tesla.
>
> RWW