Re: New DRSSTC Benchmark

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Steve Ward <steve.ward@xxxxxxxxx>

Nope, there is a surplus of primary turns now.  In fact, i can now 
remove the 2 turns of 2awg cable i have in the center of my primary 
winding (there is some loss there as the 2awg is heated noticably 
after even short runs, while the 5/8" copper tube stays cool to the 
touch).  I think i had about 2.5 spare turns on the top of my primary 
(those turns are ~21" diameter, compared to the inner turns which are 
only ~11" diameter).  So i have plenty of primary inductance to tune 
with now.

I think with a little more fine tuning, higher supply voltage 
(800-850V), and no wind I might get to my 12.5' goal.  Have to get my 
PFC boost converter finished up and make some more sparks!

Oh, and i forgot to mention i finally remembered to set out a probe 
to pick up the output voltage from the coil (or at least its 
shape).  Interestingly, it follows pspice predictions well when the 
streamers are very short, but as i get near full power, the envelope 
changes.  I dont know if this is due to detuning or because the 
streamer impedance model doesnt match reality.  Anyway, it seems like 
the 1pf per foot + 220k model doesnt hold very accurately compared 
with measured results... the model impedance seems to be too great.

Steve

On 9/25/05, Tesla list <<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx> wrote:
Original poster: "Mike" 
<<mailto:mike.marcum@xxxxxxxxxxxx>mike.marcum@xxxxxxxxxxxx>

Awesome Steve. Did you run out of primary turns again with the added caps?

Mike