Re: [TCML] Detuned or Dentured?

[bartb <bartb@xxxxxxxxxxxxxxxx>]

Hi Miles M.,

The detuned output refers to the resonant frequency of the secondary LC 
system in relation to the primary LC system. Most coilers will actually 
run their systems detuned anywhere from 3% to even 13% or more. That's 
not a problem. Often, the primary will need a little more L to account 
for spark loading. To the right of the output identifies if the primary 
inductance is high or low. You want to be detuned high on primary 
inductance (which is equivalent to a "lower" primary frequency).

If your detuned in the other direction (low on primary L thus a higher 
primary frequency), then it is usually a problem. The reason is that as 
spark loading occurs (and of course only occurs during sparking), the 
secondary system becomes even more detuned (the secondary frequency 
lowers) and thus the difference between frequencies is made even larger 
(the system further detunes itself during running). And sure enough, it 
acts like any other system that is running out of tune (racing sparks, 
sporadic sparks, etc..).

This is why it is important to tune the coil manually to "fine tune" how 
the coil performs in it's location. Programs are great to design by, 
look at what-if situations, and perform crosscheck routines, but 
manually tuning is the only way to get the coil performing at it's peak.

Best Regads,
Bart

Miles Mauldin wrote:
> I'll learn to read my notes some day.....Please disregard the term dentured, I meant detuned.
>
> Best Regards,
> Miles
>
> Sent from my iPhone
>
> On Jul 7, 2010, at 9:45 PM, bartb <bartb@xxxxxxxxxxxxxxxx> wrote:
>
> Hi Miles,
>
> What do you mean by the term "denture"?
>
> Regards,
> Bart
>
> Miles Mauldin wrote:
> I found the post below of interest as I had to recalculate my design due to only having a 20" secondary winding instead of 22". Unfortunately, I already had the primary built along with the topload. Originally I had a computed denture of 4.21% high, but now the best I can compute is in the low 50% range. Is this "detuned"? Or an awful denture that I should consider starting over?
>
> Best Regards,
> Miles
>
> Sent from my iPhone
>
> On Jul 7, 2010, at 9:25 AM, Joe Mastroianni <joe@xxxxxxxxxxxxxx> wrote:
>
> Hi Brandon,
> For what it's worth, I run my coil in my garage or driveway.  It's only 0.9KW input power, so much less output power, though I don't know exactly how much less or how to measure it.   As long as I don't run it in some sort of awful detuned mode, I have zero interference with household electronics.
>
>
>
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