Re: Problems with SRSG on TC

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

Original poster: "Gerry Reynolds by way of Terry Fritz <teslalist-at-qwest-dot-net>" <gerryreynolds-at-earthlink-dot-net>

John,

I forgot about the phase shift through the NST.  If the NST output were
unloaded, I would expect the peak output to be close to peak input (little
phase shift).  However, when loaded with a capacitor (for example) and
current flows, there is R/L phase shift in both the primary and secondary as
well as an LC phase shift in the secondary.  So I guess I was meaning to
strobe using the peak cap charge as a reference.

I dont think I understand why it is sometimes not desireable to fire close
to peak capacitor charge unless one is using more that 120 BPS.  If 120 BPS,
wouldn't one want pk charge?  If 240 BPS, I think one would want to fire
before peak so as to get a second firing in before output reverses.   Is
this thinking correct??

Gerry





 >
 > Gerry,
 >
 > Terry, myself, and others have done tests of this sort.  Using
 > NST's it's sometimes not desireable to fire at the peak capacitor
 > charge, because timing issues outweigh as a factor of importance
 > for longest sparks.  In such cases, the cap charges to a peak
 > voltage, then the voltage drops some before the SRSG fires.  If
 > one attempts to fire at the peak, the firing voltage actually will be
 > lower in some cases.  Each NST and cap combo behaves a little
 > differently.
 >
 > The capacitor takes time to charge, so there's a delay between
 > the input voltage peaks and the actual firing voltage peaks.  The
 > amount of delay needed for the gap firing for longest sparks, also
 > depends on the NST and cap combo.
 >
 > John
 >
 >