Wayne Burdick wrote:
Rob Sherwood, NC0B, an independent and well-known receiver performance
specialist, has completed his K3 receiver tests. We're pleased with the
results, which will place the K3 at the top of his comparison chart.
Rob will be updating his web site in a few days. For now, I'll just
mention a couple of his numbers (with his permission).
Elecraft K3, S/N 00149, 20 meters, preamp off:
Dynamic Range 20 kHz 104 dB
Dynamic Range 5 kHz 102
Dynamic Range 2 kHz 101*
* with 200 Hz 5-pole filter
Blocking above noise floor at 100 kHz spacing, AGC On: 140 dB
Phase noise (normalized) at 10 kHz spacing: 138 dBc/Hz
Rob performs some tests differently that we (and the ARRL) do, but in
general we're all in close agreement. Note that the unit under test had
only Elecraft 5-pole filters. Our tests show the 8-pole filters to be
as good or better, and we sent some of them to Rob to test when he gets
a chance.
Very good!
Did Rob comment on pops and transients generated in the AGC and DSP?
That was the subject of his presentation at Dayton 2007, where he gave
many examples to show that "New IF DSP designs [can] seriously
exaggerate transient noise on weak signals... Some DSP radios make QRN
much worse."
http://www.sherweng.com/documents/Dayton2007w.pdf
He also said, "I can’t wait to listen to the K3 to see if they got it
right." And...?
--
73 from Ian GM3SEK
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