RE: [TCML] Interesting Coil Wrap

["Jim Mora" <wavetuner@xxxxxxxxx>]

Hi Jeff,

Was this a misprint? I thought a bipolar (1/2 wave) coil is usually wound in
the same direction to 2x the usual 3.5-5:1 ratio. A space may be provided at
the mid point to control the coupling. The advantage of this configuration,
if I am not mistaken, is that no RF ground is needed at the midpoint. Please
correct me if I am off on this as I want to build one of these. And I have
read several conflicting responses over the last couple of months.

Thanks,
Jim Mora

Condolences go out to the Couture family

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Jeff Behary
Sent: Saturday, August 02, 2008 9:30 PM
To: Tesla Coil Mailing List
Subject: RE: [TCML] Interesting Coil Wrap


Ryan,
That's an old variation of a bipolar coil.  You can have a floating
secondary,  two coils wound in the same direction in series with their
midpoints grounded,  or you can have two secondaries on the same form wound
in different directions and grounded in the middle.  The only thing that
changes is the amount of work involved, and whether there was a common
primary coil or two primary coils back-to-back wound in opposite directions.

 
The idea of CW or CCW coils is a carry over from induction coils that used
pie sections.  The first Pancake coils were wound this way too (though two
coils in the same direction would have worked fine too, it just depends how
you innerconnect the primary coils). and when cylindrical coils started to
become marketable this was carryover from that in turn...
 
As far as the coil being placed vertically, that's strange.  Most of the
time these style coils were mounted horizontally, sparks being drawn from
each end...?
Jeff
 
> From: goleafsgo_12@xxxxxxxxxxx> To: tesla@xxxxxxxxxx> Date: Sat, 2 Aug
2008 12:47:24 -0400> CC: > Subject: [TCML] Interesting Coil Wrap> > > Hey
Everybody, I recently saw a diagram on the internet of a person using a
different coil wrapping style for his secondary. It went something like
this. Imagine a secondary coil winding that starts in the middle, instead of
one end to the other. THis person took their wire, folded the length they
wanted to use in half. From the middle of the secondary, they wrapped half
of the wire length in one direction and towards the bottom. Then, they took
the other half of the wire (the un-used portion as of yet) and wrapped it in
the opposite direction, and towards the top of the coil. My question is:
What would this be used for, and, would it actually work as a
secondary?Ryan_______________________________________________> Tesla mailing
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