Re: Calculating and Measuring Resonant Frequency / Inductance of Secondary Coil (magnifier)

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

Original poster: "Antonio Carlos M. de Queiroz" <acmq-at-compuland-dot-com.br> 

Tesla list wrote:

 > Original poster: dhmccauley-at-spacecatlighting-dot-com

 > With a magnifier,
 > the coupling is much
 > higher and the frequency split humps are much further away from the
 > independent natural frequencies of the individual resonant networks.

Not necessarily. In a magnifier, the secondary and the tertiary
coils are interconnected, and this reduces a lot the "effective"
coupling.
Example:
A magnifier operating in mode 5:6:17:

C1=   10 nF
L1=   50.4467750865 µH
C2=   13.9705353935 pF
L2=    5.4311833910 mH
C3=   15 pF
L3=   28.2 mH
k12=  0.4018612762

A conventional Tesla coil operating in mode 5:6 with the same C1
and resonator coil:

C2 = 15 pF
L2 = 28.2 mH
C1 = 10 nF
L1 = 42.3 µH
k12= 0.1803278689

In the magnifier, the transformer coupling is more than twice higher,
but the splitting between the two main resonances is the same in both
cases. The energy transfer waveforms are almost identical.

Antonio Carlos M. de Queiroz