Alex
I'm not sure if you would call 500W 'high power' - I would from a UK
perspective. In the classic EB104 I see ordinary transformers. Perhaps I'm
not understanding something, you're the expert. Where is the crossover from
flux coupled transformers to transmission line transformers?
David
G3UNA
---- alexeban <alexeban@gmail.com> wrote:
> Guys, the problem is more pernicious than that!
>
> The problem is in the way the transformers are WOUND!
>
> Efficient high power transformers are wound using transmission line
> coupling, not flux link coupling; they use coaxial line windings, with a
> very specific Zo. This technique ensures very tight coupling between primary
> and secondary, thus relieving the core from carrying high magnetic flux. The
> ferrite only serves to increase the reactance of the windings at the lower
> frequency end. Actually ferrites with a Ur of about 125 are sufficient in
> the HF range.
>
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