Re: Bi-polar almost done

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Gerry Reynolds" <gerryreynolds-at-earthlink-dot-net> 

Hi John,

A couple of thoughts come to mind.

1. Out of tune
2. Coupling too tight
3. Inadequate field control on the top load (or in this case, sideloads)
4. Inadequate impedance matching with sideload (reflected power)

Of course, Im just brainstorming.

Good luck,
Gerry R


 > Original poster: "John Richardson" <jprich-at-up-dot-net>
 >
 > I also have to keep the spark gap, as well as the output gap, tight,
 > otherwise there are racing sparks and pri to sec strikes.  Is this a
normal
 > bipolar issue?  Output is between 5-6 inches now, but I am hoping for a
bit
 > more.  I tried following the advice of Scott Hanson, and placing a small
 > toroid on each side, and performance improved, but after retuning, lots of
 > racing sparks and pri sec hits.  I would appreciate any insight into
sorting
 > this little guy out.  BTW, primary diameter is about 4 1/2 inches, leaving
 > about 1 1/4 clearance between the 2 3/8 secondary.  Due to the design of
the
 > system, I can't go any wider.
 >
 > Thanks,
 > John Richardson
 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Tuesday, April 13, 2004 9:53 AM
 > Subject: Bi-polar almost done
 >
 >
 >  > Original poster: "John Richardson" <jprich-at-up-dot-net>
 >  >
 >  > Hello,
 >  >
 >  > Well, I've almost got my little bi-polar done.  I know I did some
things I
 >  > shouldn't have, but once I get something in my head, I stick with it
 >  > regardless of better judgement.
 >  >
 >  > Specs:  All of the guts had to fit into a space 8"w, 12"l, and 6"h.  It
 > was
 >  > tight, but after much head scratching, I got it.
 >  >
 >  > Secondary:  11 3/4" of #32 heavy build on 2" pvc, OD is 2 3/8.  Four
coats
 >  > poly.
 >  > Trans:  9/30
 >  > Gap:  3 gap tungsten, forced air.  Keeping gaps close, to keep tank
 > voltage
 >  > down.
 >  > Cap:  9 .15uF 942s for a value of .0166.
 >  >
 >  > The primary isn't finished yet, as I need to set things up and
experiment
 >  > with turns to get it in tune.  After I find the correct number, the
 >  > permanent setup will be 1/8 Cu tubing in vinyl tubing, with a diameter
of
 > 4
 >  > 1/2".  Leaves little better than an inch clearance between primary and
 >  > secondary.  Anyone have an idea of how many turns I will be looking
 >  > at?  I'm hoping that it will be between 3 and 5, to heep things narrow.
 >  >
 >  > I'm hoping to achieve point to point arcs of approx. 11-12".  If this
is
 >  > unrealistic, I was hoping that any bi-polar gurus could give me a
 > realistic
 >  > figure.
 >  >
 >  > Thoughts and advice appreciated.
 >  >
 >  > Thanks,
 >  > John Richardson
 >  >
 >  >
 >
 >