Re: [TCML] JavaTC Tuning Suggestion

[bartb <bartb@xxxxxxxxxxxxxxxx>]

Hi Phillip,

Sure, it happens. You are probably running high on inductance. Coils 
"do" run better and typically between 2% and 5% high on primary 
inductance. This "is" running out of tune when the tune point does not 
include spark loading. The sparks add C to the resonator, and thus, the 
primary L must increase. I once had a coil that ran best at nearly 13% 
high on L. That was extreme, but it seemed to like it. Paul Nicholson 
once asked with the TSSP group of guys about where they run their 
primary taps and I think it was unanimous that they ran high on 
inductance for smooth and best performance. This is why Javatc has a "% 
Detuned" output on the primary and identifies if it's "high" or "low" on 
primary inductance.

Take care,
Bart

Phillip Slawinski wrote:
> I did a lot of testing with my TC this past weekend.  One of the things I
> did this weekend was increase my top load.  I resized my 6x18" toroid to
> 6x21".  This toroid is stacked below my 7x23" toroid.  When it came time to
> re-tune the coil I just did it experimentally.  To me performance seemed to
> increase as I added more primary inductance.  I had the tap at the very end
> of my primary by the end of my testing.  I just updated my model in JavaTC
> and run the numbers today and it's telling me that I should tap 2 turns
> closer to the center than I had this weekend.  I tried tapping it around
> where JavaTC suggests this weekend and the performance did not seem to be as
> good as driving it with as much inductance as I could get out of the
> primary.  When I ran it near where JavaTC suggests the discharge woudl break
> out in multiple small streamers.  When I ran the coil with the tap all the
> way at the end of the primary I would get a single breakout that went up to
> 56".
>
> I'm fairly certain the numbers I've put into JavaTC are correct.  They
> haven't been wrong in the past.  Was I running the coil out of tune, or is
> there something I could be missing?
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