Re: SSTC output looks more like SGTC output!

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

Original poster: "Malcolm Watts by way of Terry Fritz <teslalist-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz>

On 18 Jun 2003, at 20:10, Tesla list wrote:

 > Original poster: "Steven Ward by way of Terry Fritz 
<teslalist-at-qwest-dot-net>" <srward16-at-hotmail-dot-com>
 >
 > I hope this isnt "old news", but i did something recently that might be of
 > interest for those of you who like to analyze things.  Recently, i built a
 > full bridge for my SSTC (1.5KW).  I was running it with a 4.5x15" winding
 > of 30awg and a small toroid (7x1.25").  This made the typical humming
 > hissing sparks that are ghostly yellow/white when you draw ground
 > sparks.  Just about an hour ago :) i made another secondary.  This one is
 > 4.5x19" 30awg.
 > I tried putting a big toroid (5x16") on it.  At only 30% input, the sparks
 > were loud, crackling, bright white streamers about 9" long!  They only
 > appeared this way with ground strikes.  The corona output (streamers only)
 > were still purple and looked like an SSTC.  I could not crank up the juice
 > because of flashover problems.  But this makes me wonder if perhaps the
 > larger toroid is in fact charging up like a capacitor and then releasing
 > the energy in one bright SGTC like spark.  The sparks also had a 5khz'ish
 > squeal to them.  I wonder what would happen if i could run it up to 120V
 > input.
 > Maybe the thing would look just like a SGTC.  It sure was loud like one.
 > Oh, and ozone production went sky high!!!

One of the characteristics of a CW coil is that there is a more-or-
less constant feed of energy to the secondary per cycle. The
secondary will continue to ring up over successive cycles until the
voltage is high enough to overcome the breakout voltage dictated by
the topload ROC. Dr Gary Johnson built a CW-fed coil which didn't let
go for a considerable period of time and when it did, generated a
spark about 6' long.

Malcolm

 > Another thing to note is the apperance of the RF envelope.  When not
 > drawing sparks, it looked like a pretty much round blob (the common
 > look).  But when pulling arcs, the blob turned into a series of very short,
 > but equal in amplitude blobs.  Seems like each blob was an output spark,
 > and would explain the 5khz noise maybe.
 >
 > Any thoughts?  Maybe someone wants more information?  Please let me know,
 > im kind of interested in this!
 >
 > Steve Ward
 >
 >