[Amps] SS amps and auto-tune. Is it even necessary?

[qrv at kd4e.com]

What might it cost of someone made and sold a filter like this?

For a homebrew driver source, variously rated 10w, 120w, and for
an amp 600w and 1200/1500w?

http://www.qsl.net/wm5z/qex199907.pdf

73, David KD4E

> I think Manfred has a point - where the harmonics aren't going into a
> load and are being 'reflected' by the harmonic filter, I think the phase
> between fundamental and harmonics matters. The right relationship can
> enhance Po and linearity, the wrong one can hurt badly. It's not as
> simple as looking at what the filter is presenting, there's also the
> effects of matching circuits going back to the drains.
>
> With the hf bands being mostly narrow frequency segments, it should be
> possible to tweak the filters for optimum results. In broadband systems
> such as commercial or mil use, that's difficult and it's quite usual to
> have to find fixes for frequencies where an amp struggles when presented
> with harmonic filters.
>
> A real convenience of diplexer harmonic filters for the experimenter is
> that you can develop a broadband circuit running into a dummy load and
> then get very similar results when you hook up the filters and antenna.
>
> Steve