Re: More Mini Coils (scopes)
From: Malcolm Watts[SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: Monday, June 30, 1997 3:57 PM
Subject: Re: More Mini Coils (scopes)
> From: John H. Couture[SMTP:couturejh-at-worldnet.att-dot-net]
> Sent: Friday, June 27, 1997 3:35 AM
> To: Tesla List
> Subject: Re: More Mini Coils (scopes)
> At 04:47 AM 6/26/97 +0000, you wrote:
> >From: Malcolm Watts[SMTP:MALCOLM-at-directorate.wnp.ac.nz]
> >Sent: Wednesday, June 25, 1997 4:30 PM
> >To: tesla-at-pupman-dot-com
> >Subject: Re: More Mini Coils (scopes)
> >> From: John H. Couture[SMTP:couturejh-at-worldnet.att-dot-net]
> >> Sent: Tuesday, June 24, 1997 7:37 PM
> >> To: Tesla List
> >> Subject: Re: More Mini Coils
> >> A storage scope captures and holds a certain signal on the scope
> >> for
> >> study. It can not count the number of breaks/charges per spark unless you
> >> have a custom made scope.
> >Please explain. I have been examining secondary waveforms and their
> >correspondence to primary breaks. No proof has been presented that
> >you can ring the secondary up and up with successive primary shots
> >using typical break rates either.
> If you are able to count the breaks/charges for a specific spark then you
> are accomplishing what I am recommending. How do you explain the fact that
> sparks from a TC vary in length if the wattage per spark is always the same?
> The wattage is the major parameter that determines spsrk length.
We discussed all this some time back. You get an ion buildup around
the air streamers that successive shots can more easily conduct into.
Nature's example: You cannot judge voltages in lightning by distance
because of stepped leader formation connecting isolated pockets of
charge together. The fact is, that the secondary cannot be rung up
as you suggest using ordinary gaps and what are in reality, low break
rates. You can see all this in great detail on the scope. I have used
"gaps" timed to microsecond tolerances at multiple-kHz break rates to
check all this out. I published all this research last year. I stand
by every word. If you wish to believe this is wrong, you must present
a counterexample that I can measure. I have not seen otherwise in any
experiments I have tried. These range from a running coil at 1.6kVA
to single shot in coils of a range of power levels.
> Your table showing the lack of correspondance between the wall plug and
> the EcpxBKS is a good illustration of the number of TC's that do not
> corordinate the necessary parameters for good design. With good design the
> results may be even better than shown.
I am absolutely certain they will, so certain in fact that I am now
embarking on a completely different strategy to power my larger
systems that bypasses the traditional approaches. Modern electronics
has progressed way beyond the simple old transformer and choke
> > ------------------------------------------
> >> The other variable would be the spark length which is varying in length.
> >> The easiest way to average this variable is to use a horizontal continuous
> >> spark from the toroid to a ground point, a controlled spark length..
> >I refer you to Richard Hull's experiments with fans that show clearly
> >what happens to a coil that consistently produces long sparks in
> >still air.
> If Richard Hull's experiments are producing continuous sparks that are
> horizontal from a toroid to a ground point then they could be called
> controlled spark lengths.
Richard showed conclusively that a coil that can throw attached
streamers quite a few feet pretty well all the time in still air was
struggling to throw them a couple of feet with a fan blowing air
around. I've seen this too. It is acknowledged to be a major
difficulty in operating outdoors by anyone who has tried it.
> What are you referring to by "repetitive situation"? Note that a
> controlled spark length is a repetitive condition.
My definition of repetitive as applied to TCs is the repetitive
pumping of the discharge by firing the gap often enough (e.g. as
opposed to slow breaks or single shot). There is a "persistence of
ions" phenomenon at work.
> With your largest coil producing a continuous stream of sparks and now
> and then a bigger spark can you explain what is causing the bigger spark?
See above. It is definitely *not* higher voltage. A high enough
voltage will cause a spark to immediately connect with anything
close enough. You have run a TC. You know how they reach out in
random directions. IMHO, attached single shot streamers (far far
shorter than a repetitively pumped discharge in higher powered
systems) are approaching an accurate indication of the voltage the
system is producing. Your controlled spark length appears to me
to be simulating those conditions. As a measure of voltage, it
appears to be good. As a measure of how far a coil will throw sparks,
it appears to be wanting.
It is worth remembering that a spark is a huge loss. It shows that
up as a burst of heat, light and radiation. The faster the secondary
dumps its energy, the shorter the time it is going to ring for. But
if it doesn't break out and an ion buildup around the terminal still
doesn't permit it to break out, it never will. The gap will be
lighted up like an arc lamp as the lossiest element under such
conditions. Robert Stephens has an excellent tape showing a multi-kVA
system with a very large topload doing exactly this. My mini coil
also does this. In fact it is almost impossible to quench a gap when
a significant amount of energy remains sloshing around in a high Q
system according to my observations.
There is no microsecond timing available in mechanical gaps to
add to secondary energy with the necessary phasing, yet we observe
that the sparks grow with repetition while the secondary rings for
just a fraction of the period between breaks. Lest it be thought that
a random chance break just happens to occur with exactly the right
phasing to cause the stretch, you then have to explain why sparks
will hang onto a target for several hundred breaks when the
favourable chance cannot be happening for more than just a fraction
of those breaks, and, with equal probability, it can happen with the
unfavourable (subtractive) phasing.
This is what I've measured and observed anyway. Counterexamples more