"In other words, if an amp already meets FCC specs for IMD, what does
a five or ten dB improvement get you?"
I thought the FCC specs were only that the amplifier be clean enough to stay
in the ham phone band. I can easily tell the difference between an amp that
is "average" with about a -30 db 3rd order distortion and a really clean amp
that is -40 db 3rd order distortion - and as a neighbor of a ham that is
about a -20 db level, I can vouch for being near the one that is cleaner.
The difference is light night and day if you are close by. I would much
rather be near an amp that exceeded the norm.
Most amateur amps do not meet the commercial standard for distortion
products - which may be a recognition that we are "amateurs" and not
technically able to meet commercial standards. Hooray for those that do
want a cleaner amp.
Colin K7FM
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