> I'm not sure if you would call 500W 'high power'
This is not a "500W" amplifier. This claims to be a 2KW PEP
amplifier - in AM PEP is 4 x carrier. In this case an amplifier
spec'd for "500W AM" would be 4 x 500 = 2000.
73,
... Joe Subich, W4TV
> -----Original Message-----
> From: amps-bounces@contesting.com
> [mailto:amps-bounces@contesting.com] On Behalf Of
> d.cutter@ntlworld.com
> Sent: Monday, April 19, 2010 8:10 AM
> To: alexeban; amps@contesting.com; 'sasas asasas'
> Subject: Re: [Amps] 160m mosfet linear amplifier problem with
> ferrite cores
>
>
> 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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