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RE: horizontal half wave (double ended) coil

Original poster: "Ralph Zekelman" <gridleak@xxxxxxxxxxxxxx>

Dr R,

When I built my several sizes of  horizontal half-waves, the sliding
trombone design suggested itself for the reasons you give. I opted
instead for a 3-inch space
between the two halves with a single turn of the wire wrapped around the
to connect the two halves. Using the sliding trombone design, how would
suggest that connection be made? I thot the obvious of simply allowing
the wire to
form a vertical loop alongside the coil form. That was the option I
rejected in
favor of the fixed 3-inch space. My coils all use a solenoid primary.

Ralph Zekelman

Original poster: "Dr. Resonance" <resonance@xxxxxxxxxx>

A smaller 10 inch long PVC tube fitted inside the two sec coils allows
to slide the secs apart to get the best possible output and also avoids
"double-hump" overcoupling as indicated on a scope.  Use some drilled
through both tubes and a small plastic "pin or peg" to affix it to it's
final position after all the testing is through.  A 3 to 4 inch space
give the best results.  Or, once the best position is found, just glue
tubes in place.

Keep the innermost turn of the primary at least 2.5 inches away from the
coilform with dual type coils.

Dr. Resonance
----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Saturday, March 26, 2005 9:19 AM
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 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 > > >