> > Are they dB below PEP (ARRL method), or dB below a single tone
> > (commercial method)?
>
> Below a single tone. I thought I had mentioned that in the posting.
Yes, I re-read the text and see where you did mention it. It is
important to call attention to the fact you used "below one tone"
values.
The ARRL uses below PEP, making everything look six dB better.
That because PEP is four times the single tone power level (not
twice) in a two tone test.
So add six dB to the figures below, and that's what the ARRL
would publish (and a few manufacturers).
Eimac uses dB below one tone, so their figures can be compared
directly to yours. Other tube manufacturers use dB below PEP, but
don't openly tell us. Everything they sell looks 6 dB better. IMD is
like antenna tuner power ratings! You have to specifically ask about
the test, or you'll get burnt.
> > > Power 3rd 5th 7th 9th 11th 13th 15th 17th 2.5W
> > > -28 -29 -41 -47 -49 -53 -62 3.0W -24 -30
> > > -37 -48 -53 -53 -57 -64 4.0W -16 -30 -35
> > > -37 -43 -53 -58 -61
73, Tom W8JI
w8ji@contesting.com
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