RE: K formula?

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

Original poster: "John H. Couture by way of Terry Fritz <teslalist-at-qwest-dot-net>" <couturejh-at-mgte-dot-com>


There is another method of finding the K Factor. This is a much simpler
method and you have a better chance of getting it right.
Or do you?

Find the resonant frequency first
    Fr = F1 + (F2 - F1)/2
       = 193.42 + (216.1 - 193.42)/2
       = 193.42 + 11.34
       = 204.76

     K = (F2 - F1)/Fr
       = (216.1 - 193.42)/204.76
       = 0.110763

Note that this gives you a slightly different K Factor. The other K factor
is 0.1104. Which is correct? Rounding off numbers or avoid squaring numbers
when possible?

John Couture

-------------------------------------


-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Tuesday, July 29, 2003 2:09 AM
To: tesla-at-pupman-dot-com
Subject: Re: K formula?


Original poster: "Antonio Carlos M. de Queiroz by way of Terry Fritz
<teslalist-at-qwest-dot-net>" <acmq-at-compuland-dot-com.br>

Tesla list wrote:
  >
  > Original poster: "Peter Lawrence by way of Terry Fritz
<teslalist-at-qwest-dot-net>" <Peter.Lawrence-at-Sun.COM>
  >
  > Is there a formula for the K (coupling coeff) given that I know the two
  > resonant frequences that the combined primary plus secondary have.

Given the frequencies F1 and F2>F1:
k=(F2^2-F1^2)/(F1^2+F2^2)

  > at 0"   193.42  and  216.10  KHz resonances,  22.8 Hz appart
k=0.1104

Antonio Carlos M. de Queiroz