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

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

Original poster: "harvey norris by way of Terry Fritz <twftesla-at-qwest-dot-net>" <harvich-at-yahoo-dot-com>


--- Tesla list <tesla-at-pupman-dot-com> wrote:
> Original poster: "Paul Nicholson by way of Terry
> Fritz <twftesla-at-qwest-dot-net>"
> <paul-at-abelian.demon.co.uk>
> 

> Secondly, the contribution of the capacitance
> between neighbouring
> turns to the total effective self-capacitance of the
> coil is very
> small - of order 1%.  

Thanx Paul for your apt categorization of coils
resonating above the quarterwavelength value, and how
H/d ratios affect that value tremendously. This was a
great misunderstanding of mine where I was under the
impression this deviance was only 5 -10%,therefore the
redicule of the 1/4 wavelength theory might be
somewhat unjustified. I hadnt actually seen web pages
as yours where these differences are given a more
scientific basis, and thanx for pointing this out.
However I think that we can also categorize flat wound
spirals as a sort of reverse effect where the coil
appears more as a single plate capacity, in which case
 the resonant frequency instead goes far below what
the quarter wavelength consideration gives, and it is
the interwinding capacitance, or voltage between winds
that does become the predominant factor in that
reduction. The conceptial problem that begins with the
observation made with a single 50 ft spiral is that
scoping shows a 1 us cycle time for its resonant
frequency, thus this is actually almost a 5 fold
reduction of the quarterwave length value. Therefore
at first glance it may not seem sensible that such a
large deviation can take place, unless we again
consider that that the Magacable spirals themselves
have 1/8th in width of wire, and in spiraled form this
more represents a single plate capacity, thus reducing
the natural resonant frequency of the spiral coil
considerably. By using 4 winds in series in different
wiring arrangements we can produce different values of
standing waves, from the same 200 ft length of wire.
http://groups.yahoo-dot-com/group/teslafy/files/Outer%20DSR/Dsc00015.jpg

shows two 4 layer 200 ft spirals with identical
geometries and inductance, where one contains more
interphasal volts between layers by bifilar routing of
return layer winds, which produces a lower voltage,
lower frequency of 250,000 hz(shown in background) and
in close up at
4 layer spiral with bifilar winds scoping -at- 20mv/div;
1us/div 
http://groups.yahoo-dot-com/group/teslafy/files/Outer%20DSR/Dsc00014.jpg

The next somewhat higher frequency with slightly
higher voltage is increased 33% to 333,300 hz by
having at least that much of a one third ratio
reduction in interlayer voltages that is made in the
ordinary return layer routing shown as
4 layer spiral with identical winds scoping -at-
20mv/div; 1us/div 
http://groups.yahoo-dot-com/group/teslafy/files/Outer%20DSR/Dsc00012.jpg

So for flat spirals at least it seems sensible to
conclude that interwinding voltage,( where here only a
higher interlayer voltage between edges of the layers
has accomplished these differences) can in fact
considerably change the resonant frequency.

However since there is also a reduction in voltage for
reduced standing waves, one can question the ability
of spirals to act as the best tesla secondary, where
in fact its increased voltage between winds compared
to the traditional high H/d tesla secondary would
seemingly make it only a candidate for reduced
performance.

Sincerely Harvey D Norris.

=====
Tesla Research Group; Pioneering the Applications of Interphasal Resonances
http://groups.yahoo-dot-com/group/teslafy/

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