"John J" wrote in message
...
See
http://www.crystal-radio.eu/enkoppelfactor.htm

Thanks John.

What stymies me about the double-tuned transformer is this: If you look at
Hagen's exaplanation for how they can be modeled -- I've stuck a scan he
http://koltner.com/Hagen.png -- he's modeling it as the primary's parallel
capacitor is resonating with the magnetizing inductance of the IFT and the
secondary's parallel capacitor is resonating with the leakage inductance...
and this is then made more obvious if you use the high-Q approximation and
transform a parallel RC circuit into a series RC circuit. But if that's the
case... doesn't it seem as though the most straightforward way to use an IFT
would be to have a parallel capacitor on the primary and a *series* capacitor
on the secondary?

I realize that you can move impedances from one side of an IFT to another and
change the equivalent circuit model and so on and present numerous different
"views" that all end up with the same correct mathematical behavior to model
what are really just two coupled inductors, but still... does anyone using a
series resonating capacitor on their secondaries?

---Joel