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Re: [TCML] BPS Testing

In a message dated 3/11/08 9:06:21 P.M. Eastern Standard Time,  
bartb@xxxxxxxxxxxxxxxx writes:

>I would have expected at least 43" sparks with the .04uF cap. How  did it 

>run (what type of heartburn?).

Oh, I got 50" sparks or better eventually. But I  could get better than that 
with the same NST running 10nF  capacitance with a static gap on a smaller 4" 
coil with a much smaller  toroid and a "junk" setup. 
   But the SRSG wouldn't fire at all, no matter what  setting. I got things 
tuned to where it would fire, but only if it had an  initial breakout from the 
topload. Once the arc started growing smoothly, it  would sound great and make 
a nice long arc. But if the streamer extinguished, it  would have difficulty 
starting over again. 
    I also had to disconnect the Terry Filter before it  would fire the SRSG. 
In fact the power resistors red hot and broke the enamel on  them after they 
cooled. I also had to open the safety gap a little bit more than  safe to keep 
it from firing.
    I know the SRSG is synchronous; it uses the typical  synchronous motor 
and I even checked it with two stroboscopes on two occasions  to verify the 120 
BPS speed was synchronous and adjusting through the correct  range with John 
Freau's phase controller circuit. The SRSG gaps were set very  tight; the 
electrodes would kiss as they passed if you breathed on them  funny.
    I also measured the coupling with the "suicide  cord" method (after the 
primary was tuned). I can't recall where it was, but it  was perfectly 
reasonable (around ~.15 or so).
    In some ways the same coil  acted similarly when run with the SISG and 
the Pig. The "wall  plug" ammeter sometimes pegged at 60A but with no sparks off 
the top. But once  it started to break out, it grew multiple streamers loudly!
-Phil LaBudde
Center for the Advanced Study of Ballistic  Improbabilities

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