RE: horizontal half wave (double ended) coil

["Tesla list" <tesla@xxxxxxxxxx>]

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
form
to connect the two halves. Using the sliding trombone design, how would
you
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
you
to slide the secs apart to get the best possible output and also avoids
the
"double-hump" overcoupling as indicated on a scope.  Use some drilled
holes
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
should
give the best results.  Or, once the best position is found, just glue
the
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
 >
 >
 >