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Re: Coupling

Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>

Hi Mike,

Your coupling coefficient is currently at 0.083 and could certainly be adjusted. I usually like to start out at 0.15 k. If you position your primary 1" above the bottom secondary, this will get you to nearly 0.15. This is assuming the coil is tapped at 10 turns which indicates a pretty good size topload.

Take care,
Bart

Tesla list wrote:

Original poster: "MIKE HARDY" <MHARDY@xxxxxxxxxx>

I know that tweeking these coils is how we figure this stuff out, but getting educated opinions doesn't hurt. I finally got to fire up my new coil.

6" O.D. sec., wound for 32", about 1000 turns
3/8" cu tube, spaced 3/8" for 10 turns
sucker gap
right now 30 nF 35 KV maxwell
14400V  PT running @ 1800 W -125 MA

I'm not getting the performance I expect. Right now about 52" strikes.
I suspect the coupling may be a little loose. The first turn of pri.is 1-1/4" from sec, and first turn of sec. is 2-1/2" above the pri. Tomorrow I may try to find some longer nylon screws, and raise the primary.
So what do you think, am I too loose? Should I bother doinng this?