Jonathon's 6"-Tuning was 2nd light of the "Green Monster" - sec vs. pri height

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Kidd6488@xxxxxxx 

Ok, my site is at 
<http://hot-streamer.com/jonathon>http://hot-streamer.com/jonathon.

The specs aren't the greatest on there however... I just measured, 
and the closest point between the primary and secondary is 1", but I 
think the value you are looking for is somewhere between 1.25" and 
1.5" (the next few spots were).  860 turns on the secondary does ring a bell.

The primary is only 10 turns maximum (and just barely, actually like 
9.9).  I could try to add to this, but it might not come out 
pretty.  Depends on how much it matters.  My topload is 4" dryer duct 
between piepans.  I measured and it is 16" Diameter (major, or 
outside).  And about 4.5" tall.

I'm realizing now how poorly engineered this thing actually 
is.  Flaws:  *Only 10 turns available on the primary (ran out of Cu 
pipe, can probably solder more on though).  *Secondary cannot be set 
below primary (could be changed if absolutely necessary.  Last resort 
though.)   *Topload too small (Wanted to make a new one anyways, any 
suggestions on bigger toroids, easily?)

Thank you all! Its great to be getting back into this again.....

And as far as outside diam. of primary, I'm not sure right now, but I 
can measure that tomorrow if necessary...

Thanks again

Jonathon Reinhart



In a message dated 8/9/05 1:42:46 AM Eastern Daylight Time, 
tesla@xxxxxxxxxx writes:
Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>

Hi Jonathon,

The primary data is minimal (need to know inner and outer diam.).
BTW, your cap is 0.0167uF and your sec turns are closer to 860.

Based on your coil data, if the flat pri is level with the bottom sec turn:

Pri to Sec clearance = 2", then coupling "k" = 0.125
Pri to Sec clearance = 1.75", then k = 0.128
Pri to Sec clearance = 1.5", then k = 0.132
Pri to Sec clearance = 1.25", then k = 0.135
Pri to Sec clearance = 1", then k = 0.139
Pri to Sec clearance = .75", then k = 0.144

It's funny, for such a long time coupling was always a "measured"
sport. Nowadays, it's probably the #1 most accurate output of our programs.

Based on this data, it's likely you will achieve best energy transfer
when the sec bottom turn is below the primary. But, as you can see,
it helps to know the inner diameter. If I had that, I would have
given the various k values at various heights.

BTW, regarding your 11 turn primary. If it is tapped at 11 turns,
then you would need about a 37pF topload (9"x33"). I'm not sure of
the topload size you have but I doubt it's that big (maybe). If the
topload is something less, then if tapped at 11 turns, the coil is
definitely out of tune.

Take care,
Bart