"I looked all over the Kenwood TX-590 product brochure and cannot find a
clear specification for dynamic range. Not that it is the only spec of
interest, but the Kenwood company says it is a "K-3" killer, with "best
of class" dynamic range..."
It's there. Sort of. See the graph on p. 3 of the TS-590 brochure:
http://www.kenwoodusa.com/UserFiles/File/UnitedStates/Communications/AMA/Brochures/TS-590.pdf
Note that Kenwood claims 2 kHz DR (500Hz, preamp off) in excess of 107 dB.
Pretty extraordinary right? But note that the claim is on 20m where a
down-conversion scheme to 11 MHz is used. What about WARC and 10m? If
those bands are using up-conversion, then there will likely be a big
disparity in attainable DR across bands. The TS-590's down-conversion
scheme is optimized where contesters need it most.
By contrast, the Eagle's design should result in reasonably uniform DR
across HF bands, at least through 10m. Hopefully, Sherwood, QST, and RadCom
are ready to spend more band-by-band time with their measurements because
the variation in results is going to be very interesting.
Paul, W9AC
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