Re: Bart's Coil (was How many STSG's in service?)

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

Original poster: "Barton B. Anderson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <tesla123-at-pacbell-dot-net>

Hi John, 

I measured Mutual Inductance this morning as requested. 11.04A on primary and
measured 2.72V across secondary. I did this a few times to ensure accuracy.
Values remained constant. Now, all this depends on measured inductances for 
true accuracy, but I don't have an LCR handy (I know, shame on me). 

Here is a comparison with ACMI, JavaTC, and JHCTES. 

                    Mu           K          Ls             Lp 
ACMI        628.9     0.1586    121.8        128.98 
JavaTC      653.5     0.1665    121.33      126.9 
JHCTES    653.5     0.1686    121.23      123.88 

Note: JHCTES Mu above is calc'd by me from JHCTES Ls and Lp outputs, same as
with JavaTC's Ls and Lp outputs. ACMI Mu and K are pure program outputs. If I
were to use ACMI's Ls and Lp outputs and run calc's based on my measurements,
then Mu would be 653.52 and K would be 0.1649. 

When I ran JHCTES 3.3 today, it asks for Sec. above Pri. In my case, the
secondary is "below" the primary, so the input should be (-1.25). JHCTES
defaults to zero (or appears to based on outputs). 

So, with all that said, I'd say K falls somewhere between 0.159 and 0.169.
Really have to LCR it, to narrow it down. 
-- 
Barton B. Anderson 
<http://www.classictesla-dot-com>http://www.classictesla-dot-com 

Tesla list wrote: 
>
> Original poster: "John H. Couture by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <couturejh-at-mgte-dot-com> 
>
> Bart's coil is a beauty and it appears to follow the outputs of the JHCTES 
> Ver 3.3 very well.  Click on 
>
>       <http://home.att-dot-net/~couturejh/>http://home.att-dot-net/~couturejh/ 
>
> Enter for the 4 Primary inputs - Spiral 
>   .042 - 11 - 0 - 11 
> Enter for the 5 Secondary inputs 
>   4.25 - 1721 - 42.73 - 28 
>
> The outputs will be for the oper freq = 68.9 and the pri turns = 14.8 equal 
> to Bart's coil specs. 
>
> The output for the K factor = .157 assumes the sec and pri bottom turns are 
> at the same level. This appears to be a little high. 
>
> With the mutual inductance test and 2.653 amps in the primary the voltage 
> across the secondary coil will be about 617 millivolts (the mutual 
> inductance). With the secondary 4 inches above the primary the voltage would 
> be 395 mv (mutual inductance) and K= .101 
>
> Bart - I would be interested in the results if you ever make these test. 
>
> John Couture 
>