Re: Ratio of primary outer dia.

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

Original poster: "RIAA/MPAA's Worst Nightmare" <mike.marcum-at-zoomtown-dot-com> 

So a large primary inductance with smallish cap (x-ray transformer) is worse
than a small inductance with large cap (pole pig) assuming same kva and
Fres?
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, December 08, 2003 2:10 AM
Subject: Re: Ratio of primary outer dia.


 > Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com>
 >
 >
 > There is no "exact ratio" because the design depends on two factors, not
 > one.  These two factors include the primary inductance and the primary
 > capacitance.
 >
 > Our procedure goes something like this:
 >
 > First, more capacitance usually provides higher peak currents and more
 > energy available to couple into the secondary system.  Keeping this
 > important factor in mind, we tune as follows:
 >
 > Using a "scrap wire" primary, usually 24 turns to 30 turns, we tune the
 > system with the size capacitor a computer program dictates.  Now, you have
a
 > basic tune with fixed capacitance.
 >
 > If you are in the range of 6-12 turns (with NST) or 3-8 turns (with pole
 > xmfr), you have a good, but not optimum capacitance.
 >
 > Now, we tune for optimum capacitance by adding more capacitors and
reducing
 > the # of primary turns.  Our final goal is 6-12 turns with NST or 3-6
turns
 > with pole xmfr.  A large capacitance value provides more peak current and
 > additional energy available to couple into the secondary system.
 >
 > This "turns reduction" as I call it usually provides significant
improvement
 > in secondary output (assuming your spark gap is up to proper quenching of
 > additional current).
 >
 > If you increase the cap size you may also have to adjust your power supply
 > to provide more energy to charge the larger cap.
 >
 > These procedure are time consuming but assist in the quest for optimum
 > output for any system large or small.
 >
 > Dr. Resonance
 >
 > Resonance Research Corporation
 > E11870 Shadylane Rd.
 > Baraboo   WI   53913
 >  >
 >  > Does someone have a rule of thumb for determining  primary outer
diameter
 >  > based on secondary diameter and height?
 >  > I did an archives search, but came up with nothing definitive.  I am
sure
 >  > that there is a ratio for optimum performance.  Also, if John Couture
is
 >  > reading this, are you planning on publishing an updated version of your
 >  > construction guide?  Mine is from the early 90's, and I was curious if
you
 >  > are planning to integrate some of the last decade's developments into a
 > new
 >  > book.  I certainly hope so.
 >  >
 >  > Thanks,
 >  > John Richardson
 >
 >