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high coupling -> racing sparks was Re: horizontal half wave (double ended) coil
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- Subject: high coupling -> racing sparks was Re: horizontal half wave (double ended) coil
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- Date: Sat, 26 Mar 2005 14:44:17 -0700
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Original poster: "Jim Lux" <jimlux@xxxxxxxxxxxxx>
Subject: Re: horizontal half wave (double ended) coil
> Original poster: "Bob (R.A.) Jones" <a1accounting@xxxxxxxxxxxxx>
> > Original poster: Paul Nicholson <paul@xxxxxxxxxxxxxxxxxxx>
> > It is well known that too much coupling tends to cause breakout
> > in unwanted places, such as along the coil. The speculative
> > explanation above may be wrong or only part of the story, but the
> > adverse consequences of high k are well established by coilers, as
> > is the cure: reduce k. The non-split bipolar doesn't offer much
> > opportunity for k reduction without changing the primary dimensions,
> > so maybe some off-axis inductance is the answer.
> Hi k causes more energy to be coupled in to the high order modes of the
> secondary and hence less in to the split fundamental frequency.
> The energy in the higher order modes may not contribute the spark
> and or are dissipated more quickly. They are probably the major cause of
> start of racing sparks.
> The coupling problem can be solved relatively easily by having the center
> area of the secondary with no windings or an adjustable spacer between
> This will effect the secondary frequency too unfortunately.
Another plausible explanation for high coupling (k) causing racing sparks is
that it causes the secondary topload voltage to rise higher. A lower k
gives time for streamers to develop and absorb energy (which comes from the
top load), which in turn reduces the peak topload voltage.