Ron -
Well, a little research can be a useful thing!
The FCC Part 97 rule is now 97.307. General requirement is 43 dB below
"mean output power".
The last sentence is not really clear, but implies that this requirement
does NOT apply to transmitters first marketed before Jan 1, 1978.
(d) F
Ron -
The problem isn't so much harmonics as 3rd order distortion. Especially
if the final tubes are not particularly well matched, the cathode
resistors have changed value, etc The Finals are run at just about
the limit for "clean" SSB, i.e., 3rd order down at least >30 dB is the
spec
with finals failing the whole time that I owned and used it!
Date sent: Sat, 10 Oct 2009 14:28:46 -0700 (PDT)
From: Ron
To: Drakelist
Subject:[Drakelist] FCC part 97.73 spectrial putiry question
> I've often wondered wh
I've often wondered why the TR series (with 3 finals) is only allowed 10 more
milliamps of final plate current than the twins (with 2 tubes). That being 350
vs 340. Is it that multiple tubes in parallel are by their nature more prone
to distortion and therefore harmonics? Ideas?
If you are u
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