Thanks, again, Paul --
Although, I am not seeing it yet ... unless you are interpreting
the chart/graph that appears at the bottom of page 3 on the brochure.
THE KENWOOD BROCHURE SAYS:
On 15, 20, 40, 80 or 160 meters, the TS-590S employs
down conversion* for the first IF (11.374 MHz).
What really determines RX performance is the 2nd
Roofing Filter, after the post amplifier. The TS-590S
comes equipped with a 500 Hz and 2.7 KHz BW 6-pole MCF.
This results in superb dynamic range when adjacent signals
are present, performance that was not previously
possible using up conversion.
*For 1.8/3.5/7/14/21 MHz Amateur bands, when receiving
in CW/FSK/SSB modes down conversion is selected automatically
if the final passband is 2.7 kHz or less.
THE TEN-TEC EAGLE BROCHURE SAYS:
IMD3 Dynamic Range: 100dB/20kHz, 99dB/2kHz, 300 Hz BW,
preamp off
Blocking Dynamic Range: 141dB/20kHz, 130dB/2kHz, 500 Hz BW,
preamp off
Can someone with greater expertise than I have say which is
better and why?
============================= K8JHR ===============================
On 9/29/2010 6:33 PM, Paul Christensen wrote:
"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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