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Re........ Measuring Coupling Coefficients


From: 	Malcolm Watts[SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: 	Tuesday, December 09, 1997 10:12 PM
To: 	Tesla List
Subject: 	Re........  Measuring Coupling Coefficients

All, 
     I don't know how many times I should post on this one.....

> From:   John H. Couture[SMTP:couturejh-at-worldnet.att-dot-net]
> Sent:   Tuesday, December 09, 1997 2:01 AM
> To:     Tesla List
> Subject:    Re........  Measuring Coupling Coefficients
> 
> At 04:59 AM 12/8/97 +0000, you wrote:
> >
> >From:  terryf-at-verinet-dot-com[SMTP:terryf-at-verinet-dot-com]
> >Sent:  Sunday, December 07, 1997 7:01 PM
> >To:    Tesla List
> >Subject:   Re........  Measuring Coupling Coefficients
> >
> >All,
> >        Mark's program will be a major benefit to those who do Tesla coil
> >modeling.  The mutual inductance between the primary and secondary coils has
> >always been a very difficult factor to predict. This will provide one of the
> 
> >--------------------------------------------------- snip
> 
>   I agree that Mark's program will be a major benefit to TC design.
> Hopefully it will eventually be incorporated into a comprehensive program
> that will calaculate all of the necessary TC parameters and automatically
> keep them in tune when changes are made like the JHCTES program. The more of
> these programs that become available the better for coilers.
>    JHC
> ----------------------------------------------------- snip
> 
> >The equation Q = 6.283 F L does not sound correct.  The equation 6.283 F L
> >is equivalent to the inductive reactance of a single coil, not it's Q.
> 
> --------------------------------------
> 
>   You are correct. The equation should be   Q = 6.283 F L / R
>   The Rp and Rs are related to mutual reactance by  Xm = sqrt(RpRs).
>     JHC
> 
> -------------------------------------------------------- snip
> 
>   The equation ( K = >1/sqrt(QpQs) ) will predict a K of 0.0527 but does not
> take into account
> >that the two coils are separated by 150 feet and thus have a K of zero.
> 
> ------------------------------------
> 
>    The K - 1/sqrt(QpQs) is for mutually coupled coils so the K would not be
> zero.
>    As Q depends on F it would appear that coupling depends on frequency. I
> havn't seen an explanation for this contradiction with other K factor equations.
>    JHC

...but post I did not two days ago.  k <> kc!!!!!!!!!!!!!!!!!!!!!!!

Call kc anything you like other than k!!!!  It simply describes 
*LOSSES*, not coupling.

Sheesh,
Malcolm
<snip>