RE: Static gap BPS, was Static Spark Gap

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

Original poster: "Lau, Gary by way of Terry Fritz <teslalist-at-qwest-dot-net>" <Gary.Lau-at-hp-dot-com>

I just measured the BPS of my mini coil, using a partially-deshunted 4/20 
NST.  Using a digital storage scope, I scoped the field coming off the 
secondary over a 400 msec interval with a scope probe hanging about 8 feet 
from the coil.  I tried 3 different cap sizes:
Cap	BPS
.012uF	297 BPS
.02uF	207 BPS
.025uF	157 BPS

FWIW, Gary Lau
MA, USA


 >I was surprised to hear Terry suggest that the BPS will ultimately work 
out to be roughly 200 BPS,
 >or any particular number.  I know that the BPS is strictly dependant on 
cap size and gap width,
 >so I'm not sure how such a generalization can be made.  Maybe I'll 
measure my minicoil's BPS tonight...
 >
 >Gary Lau
 >MA, USA