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Re: [TCML] How close is close enough? (Primary capacitance)

Hi Brandon,

As far as whether to go higher or lower than the recommended capacitance, If irc, you want to go higher than the desired capacitance because it's easier to take away some of the capacitance than adding some. I don't know exactly how you would fine tune the capacitance, but I assume it involves soldering on an extra smaller cap to decrease the capacitance a bit. Opposed to desoldering and removing a cap from your MMC. Hope that helps.

Brandon, AZ

On Mar 23, 2010, at 8:33 AM, Brandon Garretson <garretsontech@xxxxxxxxx> wrote:

Greetings TCML,
My question today is regarding primary capacitance and how much
headroom we have to play with while still achieving close to maximum
Between being a bit of a noob and more than mildly math-tarded, I tend
to rely on programs to do the math for me as well as searching this
incredible forum for posts from people who have encountered similar
problems. But what I have not been able to deduce thus far is this;
How close is “close enough”?
I feel that Telsamap and JavaTC are very helpful applications
(although they don’t always seem to agree which makes things even mo re
confusing). They give you very specific data as to what the primary
capacitance should be in any given tank circuit, not a narrow range,
but a seamingly dead-on set in stone number.
In an ideal world, we could nail that number every time. But since we
(I) live in a much less than ideal world (the real one), some of us
(myself) are required to work with what we have.
The core of my question is this, how many nf away from the ideal
capacitance can one go before he can no longer compensate through
tuning and still achieve good, if not excellent, performance?
Im sure the amount of leeway would be different depending on the size
and design of the apparatus so let us say we are talking about fairly
conventional, medium sized, NST powered RSG devices.
To give a specific example, lets say the design on paper demands 17nf
but your cap is 20, same design with a different transformer, it wants
35nf and the cap you have is only 33.
Are a few nf in either direction going to noticeably impede performance?
If one had to choose a less than perfect capacitance is it better to
go bigger or smaller?
Is there a certain percentage, in general, of the ideal capacitance
from which one can deviate were any slight decrease in performance
would go unnoticed? Say +/- 10%, or would it be closer to +/- 1%?

Brandon, NJ
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