Re: Top-load altering Q-factor of secondary cct

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

Hi Gavin,

I believe the formula you state here is meant to be interpreted as:

Q = 1/R * sqrt(L/C)  where the sqrt is in the numerator.

As the top load is increased, the Q will decrease (everything else 
the same).  However, as the topload is increased, the frequency will 
decrease and the copper losses due to skin effect and proximity 
effect will be reduced.  If R decreases faster than 1/sqrt C 
decreases, then the Q could be affected positively.  I just dont know 
who wins. A lot depends on the degree that proximity is saturated and 
how the skin depth compares to your wire quage.  I've been working on 
a program to compute Q (including proximity and skin effects) that 
uses the Fraga equation.  This should be available tonite at:

http://hot-streamer.com/temp/GerryReynolds

There is (or will be) the executable (for windows), and the source 
and Makefile (if someone wants to recompile it for their 
platform).  I had a bug that affects awg24 so if the version that you 
get doesn't work with 24, the fix is on its way.

Gerry R.

> Original poster: Gav D <gdingley@xxxxxxxxx>
>
> Hi all,
> I read in a book written by Richard Hull that increasing the 
> top-load will increase Q-factor of a TC secondary. I assume there is 
> a limit to this set by Q= 1/R sqrt(L/C). Has anyone either 
> experienced this and/or know of any theory for why this happens?
>
> Thanks,
>
> Gavin