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Re: Coupling

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

I'm tapped at about 8 turns. I plan on a bigger topload once I get the bugs
out. Do you really mean to put the primary above the bottom turn of sec?
Won't this cause racing sparks? How did you calculate the coupling from my
measurements?
----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Monday, November 14, 2005 10:36 PM
Subject: 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?
> >
> >
> >
> >