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Re: I'm a newbie coiler!- apartment coiling
Original poster: "Kurt Schraner" <k.schraner@xxxxxxxxxxx>
Hi Gerry,
from my twin-experience.
No need to wind one coil opposite to the others: winding all 4, the
sec's and the prim's, in the same direction, then connecting the
prim's "inner to inner and outer(=tap) to outer(=tap)" of the
seriesed prim's gives the right phasing. In the ideal case, the
center connection of the symmetric system would be just at zero
potential, and Bert Hickman's statement would apply perfectly. ...but
potential is not quite zero, because of the unavoidable capacitive
imbalance of the surroundings. So, if disconnecting the ground
attachment, replacing it by a small sparkgap, you will see it firing
occasionally. ...or , opening it too much, sec to prim strikes may
occur. For capacitive effects see also:
http://www.ttr.com/Model12_ITS_article.htm
..."System Design", near end of chapter.
Connecting the prim's the opposite way, you notice 2 sec's throwing
leaders, each for itself, avoiding the connection of sparks, which,
obviosuly, is not unexpected.
I'm using 2 twins in my basement lab, and indeed twins are an easy
way to generate "big" sparks in a limited evironment: the older one
is for ~2.2m and the newer(UBTT) for up to ~1.5m sparks. There is a
little report on the UBTT at:
http://home.tiscalinet.ch/m.schraner/UBTT-Betrieb.pdf (ca.4.5MB)
(Sorry for my US friends: it's in German language)
BTW: the prim's have been replaced by these nicer looking, and more efficent:
http://home.tiscalinet.ch/m.schraner/FlatPrim_1555.jpg
Some behaviour of my older twin can be had on my homepage:
http://home.datacomm.ch/k.schraner/movie1.htm
While, "thinking" the phases of the resonators might slightly drift
away from each other during the end of the discharge cycle, I
estimate, during the formation of the discharges, with conducting
spark gap, they will be quite well in antiphase. Though sorry, not
having measured evidence for it.
Best regards, Kurt
Tesla list wrote:
Original poster: "Gerry Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
Hi Steve,
I can see how the two secondaries are kept in sync while the primary
still has energy in it. I can also see how sync is maintained after
quencing if the two secondary bases area connected and NOT
grounded. But, I still dont know how sync is maintained if the two
bases ARE grounded. Seems like one secondary know nothing about the
other secondary if it sees an "ideal" ground at its base. Could it
be that a NON IDEAL ground is needed so the little voltage on the
ground (and at each base) acts like a base pumped coil. If so, does
one coil need to be opposite wound from the other coil. I need to
ponder this.
Gerry R.