Re: How to rise the secondary? (fwd)

To: tesla-at-pupman-dot-com
Subject: Re: How to rise the secondary? (fwd)
From: Tesla List <mod1-at-pupman-dot-com>
Date: Wed, 15 Jul 1998 22:02:58 -0600 (MDT)
Approved: mod1-at-pupman-dot-com

---------- Forwarded message ----------
Date: Tue, 14 Jul 1998 22:30:57 -0700
From: "Antonio Carlos M. de Queiroz" <acmq-at-compuland-dot-com.br>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: How to rise the secondary? (fwd)

John H. Couture wrote:

>   Coupling is not a critical adjustment for Tesla coils and exact coupling
> is not necessary. In fact, when the secondary is  raised if only the
> coupling changed the only change would be a reduction in the TC output. The
> reason the output does change is because the tuning changes and this is very
> important and must be precisely set to obtain maximum output from the TC.

Changes in the coupling ideally do not affect the resonance frequencies 
of the
primary and secondary circuits, and so do not affect the tuning, if only 
the
mutual inductance of the coils is affected. Moving the coils apart does 
not
affect their self-indutances, and so does not affect the relation 
C1L1=C2L2.
Note, however, that marginal effects affecting parasitic capacitances and
transmission line effects may appear, and the tuning point may have to be
slightly adjusted to compensate for them if the secondary is rised.

Antonio Carlos M. de Queiroz