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Re: Coupling Experiments
Tesla List wrote:
>
> >From MALCOLM-at-directorate.wnp.ac.nzMon May 20 12:25:22 1996
> Date: Mon, 20 May 1996 11:53:24 +1200
> From: Malcolm Watts <MALCOLM-at-directorate.wnp.ac.nz>
> To: tesla-at-pupman-dot-com
> Subject: Coupling Experiments
>
> Hi all,
> Below is a table of dynamic (shunt) resistances measured
> across several primary circuits with different values of coupling to
> the secondary for different values of secondary load (shunt)
> resistance. I examined the system as a coupled black box with the
> primary as one port and the top of the secondary as another.
>
> Challenge : pick the "best" primary configuration for the particular
> secondary used (with reasons) (assume a coupled system when sparking).
> I used the df/F method for measuring k. Fr was about 146kHz. All
> values in Ohms.
>
> Load R -> o/c 220k 22k 2.2k 220 0 Ohms
> ------------------------------------------------------------------
> 50nF,25uH
> k=0.2 5 266 334 391 394 - (no change)
> k=0.145 13.5 407 383 419 - -
> k=0.082 37 373 349 356 349 -
> k=0.066 96 347 342 - - -
> 25nF,50uH
> k=0.185 32 479 1.06k 1.42k 1.49k -
> k=0.124 29? 1.04k 1.09k 1.19k 1.2k -
> k=0.059 140 1.1k 1.05k 1.02k 1.08k -
> 18nF,66uH
> k=0.17 21 709 2.45k 6.11k 7.15k 7.4k
> k=0.101 47 1.93k 4.14k 5.93k 6.23k -
> k=0.053 170 4.56k 5.09k 5.57k 5.69k -
>
> Measurements aren't claimed to be stunningly accurate but I think
> are very indicative.
>
> Regards,
> Malcolm
Hi Malcolm
Could you explain again the df/F method for measuring k please? I have
tried using the difference in Lp with the secondary open and shorted but
I get gibberish answers. Now that I think about it, are you measuring the
resonant frequency difference with the secondary open and shorted?
Thanks
Skip