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Re: [TCML] Is this right?

Hi Ben,

I really don't understand how Brooke Clark could have ever come to the conclusion that a self-resonant coil has a Q of 1. This is easily refuted by a few simple measurements, and most well constructed Tesla Coil resonators easily achieve Q's in the range of 200 - 300. It sounds like Mr. Clark is simply a bit confused about Tesla Coil operation and practical Q measurements for unloaded and loaded Tesla Coil resonators. Q is a measure of the energy stored in the inductor divided by the energy lost PER CYCLE. One form of Q can be written as:

Q = 2*pi*Fr*L/Rac

 Fr = resonant frequency
 L = Inductance
 Rac = equivalent resistance of inductor at Fr

It can easily be seen from the above equation (and easily experimentally confirmed) that Q actually $decreases when external capacitance is added, since this lowers the resonant frequency of the circuit. There are a significant number of other inaccuracies on Mr. Clark's site as well...

The TCML used to modify all URL's and email addresses by substituting a "dot" for a "." in an attempt to thwart 'bots from harvesting addresses for spammers. Don't know how well this worked though.


Ben Sneath wrote:
hello all,
i found the on the website:  www.prc68.com/I/electron.shtml
(if the link shows up)
...All of the above is very important since a coil operating
at it's self resonant frequency has a Q of 1, no matter how
it was made.  (This is something that 99.99% of the Tesla
coil builders don't get.)  So in order to get high Q you
need to load the coil with a capacitance that's
substantially larger than the self capacitance.   You can
see the it's very important to not only wind the coil in
such a way that the HF resistance is minimized but also in
such a way that the self resonant frequency is as high as

is this true? secondry with a Q of 1 no matter what when @
its res. frequency?????
if it is right then how does that happen??

BTW...why in older posts was the "." replaced with the word
"-dot-" in links?
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