Re: Ratios

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

Original poster: Esondrmn-at-aol-dot-com 

In a message dated 10/28/03 7:51:16 AM Pacific Standard Time, 
tesla-at-pupman-dot-com writes:


>OK.  I know of the magic ratio for the secondary being alpprox. 4.5 -
>1.  Are there ratio's for the PRIMARY?? Height to diameter or whatever.  I
>am thinking of a cone-shaped primary.  I will be using 1/4" copper pipe,
>with a 1/4" gap, giving 1/2" on center between windings. Is there a
>specific ratio I should use for height/angle, or primary/secondary size?
>
>I am currently looking at a 4" secondary, but I know it's out of ratio for
>the height.  I built it before I knew about that.  :(  I want to build an
>8" secondary, following the 4.5 - 1 ratio to use with my new polepig.  I
>want this coil to be built close enough to the "standard" so I can
>troubleshoot easier.
>
>Any help you tesla masters can give a newbie would be greatly appreciated.
>
>Thank you.
>
>Chris K.
>Clio, MI, USA


Chris,

Any specific reason that you want to go with a cone shaped primary?  I 
would definitely advise you to build a flat primary.  Go with 14 to 15 
turns - but first do the math and insure that the design will tune with 
about 12 or 13 turns which will leave some room for experimenting.

For secondaries, I prefer to go with 4.5 : 1 or even 5.0 : 1 ratios.  I 
like to have the toroid as far from the primary as possible and the longer 
winding length allows larger wire size.  Determine your winding length then 
select the correct wire size to produce 1,200 to 1,400 turns on the secondary.

Ed Sonderman

Ed Sonderman