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From: Malcolm Watts [SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: Sunday, March 15, 1998 4:18 PM
To: Tesla List
Subject: Re: Two strang things my testing has found???
Hi Terry,
> From: terryf-at-verinet-dot-com [SMTP:terryf-at-verinet-dot-com]
> Sent: Friday, March 13, 1998 2:35 PM
> To: Tesla List
> Subject: Re: Two strang things my testing has found???
>
> Hi Malcolm,
> I have looked at waveforms from an antenna and the probes side by
> side and you are correct. There are certain sweet spots in the position of
> the antenna that give much more accurate readings. Also the grounding of
> the scope and the scope itself can be sources of additional noise that need
> to be considered. One thing I would like to try is to use the probe to
> calibrate an antenna. The antenna has the advantage of somewhat higher
> bandwidth (if there is anything significant above Fo to see). Also, if my
> plan to measure secondary voltage doesn't work, using the probe to calibrate
> an antenna to the secondary waveform my give a solid way to really measure
> the output voltage.
That is a method I am mentally working towards. The basis is that any
probe must have its influence monitored by others as the whole thing
is terribly interactive. One preferably wants to position probes to
minimize their influence on each other. A tempting approach is to
position probes on opposite sides of the terminal so they are
shielded from each other. Another is to use the backward C
extrapolation by adding known amounts of C from top to bottom inside
the coil form and then adjusting those amounts while monitoring the
external e-field. (I wish someone would pay me a living so I could
really get all this done :(
> You obviously do much experimenting, do you have any papers or
> published results that you could share with us telling of your experiments
> and results?
>
> Happy coiling,
:)
I have only one formal Tesla-related publication - an article in
the British magazine "Electronics World and Wireless World" March '95
with a correction published a month or two later and further notes in
a letter published several months after that. It is not complete and
it is not error free (Voltage equation invalid and terminal C
equations incorrect) but reflects a hard 4 - 5 months research
starting from nothing and in theoretical terms has stood the test of
time and experiment reasonably well. Most importantly, it gives a
guaranteed recipe for designing and building a sparking coil,
inelegant though it might appear to some.
Other than that, I've released all experimental results to the
list which I joined sometime after that publication. All of my
results should be in the list archives. Sorry to sound obscure but I
have never formally catalogued them on my home PC. They are simply
"there somewhere" for posterity as much as anything. My notebooks are
not stunningly well organized either but considerably more accessible.
If you have a particular query, ask and I'll try and find the notes :)
Regards,
Malcolm