Re: Coupling

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

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Pyrotrons-at-aol-dot-com>

Hi Ben.

I use a flat primary for everything.

Use anywhere from 0 to 15 degrees of coupling and you'll never have to worry 
about it. There is a factor called "K", this is the "coefficient of 
coupling". In other words, this number tells you how much of the primary 
coil's magnetic field "couples" or "gets into" the winding of the secondary 
coil. There is a magic coupling coefficient that you should shoot for, but I 
forgot it. I know that coiler Gary Lau knows it.......

A helix primary has a very high coupling coefficient, probably too high. Flat 
primaries are the way to go for big coils, and small coils could possibly 
benefit from tighter coupling.

A flat primary coil has a relatively "loose" coupling compared to the "tight" 
coupling of a helically wound primary.

Research the archives at www.pupman-dot-com.

Cya, have a good one.

Justin Hays
KC5PNP
G-3 #1150
Email: pyrotrons-at-aol-dot-com
Website: www.hvguy-dot-com