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Re: [TCML] tank circuit power
On 5/16/2012 4:36 AM, Jim Lux wrote:
Heating depends on I^2R losses over time and
the heat that will occur on the primary at that inner turn or two if
very different for SG compared to SS. We can attempt rms numbers in the
primary, but if your gonna do that, don't leave out proximity effects
that occur from circulation currents from turn to turn and whatever
else.
I don't know that there's any extra current turn to turn, but there
probably is an uneven current distribution "around" the tube.
There are proximity losses of course and basic losses through the main
impedance of the primary. The can be all significant. For little coils
running basic NST's and what not, no, it's of no concern. It's always a
power thing.
The real question is "how much performance increase will I get by
changing from AWG 12 wire to 1/4" copper tubing or 3/4" copper tubing,
or something like that.
hehe, yeah! Well, a power function across that primary impedance.
Some people do big power and DRSSTC's naturally heap power across that
primary. In those cases, there's a substantial difference between 1/4"
tubing and 3/4". But when power is low, there is no difference, just
wasted copper I guess. The problem is, you can't ever say 3/4" is a
waste, because it's based on thermal dissipation and the power applied
across it. IF we're going to say yes or no to a question on copper size,
lets figure out how much power is being applied and if the tubing size
is risky or not. It is better to be empirically based on this particular
subject because of the many variables that occur and because this era of
coiling. SG's are being built and DR's are being built, and DR's are no
longer just a coil that is built now and then, many are doing it and it
wouldn't surprise me that they exceed SG coils soon in numbers. TCML has
always mainly had an SG knowledge base, and much of the information
received here is based on those experiences. It's all good, but times
are changing and solid state coils need to be addressed more. Primary
tubing size is simply a perfect example where SG and SS differ.
Back in the day I would think "well surely they understand were talking
about an SG coil using an NST"... problem is, I've run into SS coilers
that had a hard time even comprehending SG coils. As I came from spark
gap (SG), I had a hard time relating to these solid state guys until I
dived in head first (the only way to jump in). It's almost like a
generation gap. Would be cool if we could focus on both. I dunno, I
rarely do TCML post anymore simply because I'm doing solid state coils
now (exclusively).. there is just not a lot in here about that. But when
I see a post like this one, I have to add to it, because it matters ( I
don't want a solid state coiler getting the wrong impression I guess).
Take care,
Bart
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