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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 formation
and or are dissipated more quickly. They are probably the major cause of the
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 them.
This will effect the secondary frequency too unfortunately.

Robert (R. A.) Jones
A1 Accounting, Inc., Fl
407 649 6400