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
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