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Re: How to rise the secondary? (fwd)



---------- Forwarded message ----------
Date: Tue, 07 Jul 1998 19:30:14 -0500
From: Bert Hickman <bert.hickman-at-aquila-dot-com>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: How to rise the secondary? (fwd)

Bill,

Ls is typically computed or measured via an RLC meter or bridge. Ls is
treated as a lumped parameter (and many of us now feel a bit more
comfortable doing this thanks to Terry's recent measurements). The
operating frequency of the secondary and toroid is measured by looking
for maximum resonator base current when driven from a low Z RF sinewave
generator. Note: the primary power leads should be disconnected from the
rest of the primary tank circuit to prevent interaction with any RF
protection circuitry from influencing the measurement). Cs or Cs+Ct is
then back-computed. This measurement should be done where the coil will
ultimately be used.

-- Bert --

Tesla List wrote:
> 
> ---------- Forwarded message ----------
> Date: Tue, 07 Jul 1998 08:52:28 PDT
> From: Bill the arcstarter <arcstarter-at-hotmail-dot-com>
> To: tesla-at-pupman-dot-com, couturejh-at-worldnet.att-dot-net
> Subject: Re: How to rise the secondary?
> 
> John Couture wrote:
> 
> >  You build great coils so I am not going to tell you how to tune your
> >coils. However, a computer can tell you if the tuning equation
> >  LpCp = LsCs   is balanced. The tweeking can be done with taps
> >on the primary of a properly designed and tuned coil.
> 
> I have questions regarding how these values are determined.
> 
> Lp, Cp, are easily measured using any number of techniques.  But what
> about Ls or Cs?
> 
> Does Ls represent the "lumped' inductance of the secondary, measured (as
> above) between the base and top toroid?  I would bet this is the case
> but an not 100% sure.
> 
> But the really tricky one is Cs.  The only way I can see to determine
> this is by measuring the actual self resonant frequency of the secondary
> and toroid using a sig gen, 'scope and all that.  Then - you compute Cs
> via the frequency and Ls..
> 
> Any hints?  How are you folks determining these values?
> 
> -Bill Pollack (arcstarter)
> 
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