[AMPS] Tuned Input Circuit Q

Tom Rauch W8JI@contesting.com
Mon, 8 Oct 2001 04:52:00 -0400

> Denny Had thought otherwise for years.
> Eimac still honored their warranty, and the FCC
> did not seem to care.

None of that matters Phil, because none of that means anything.

None of them are concerned about what improper Q or circuit style 
would do.

The only potential problems are a lack of maximum efficiency and 
IMD performance in cases where the harmonics distort cathode 
waveform, or exciter shutdown in solid state rigs if cathode 
harmonics make it back to the SWR sensing system.

The first time I ever saw a severe problem was in a homebrew pair 
of 3-500Z's, that only made 45% efficiency on 15 meters despite a 
perfect SWR on the input, and two-tone was -32 3rd below one 
tone. Doing a proper tuned input raised everything to normal ranges.

The FCC, Eimac's warranty dept, and Denny Had would never care 
about something like that.

73, Tom W8JI

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