On Sun,7/26/2015 5:33 PM, Bill Breeden wrote:
The point I am trying to make is that a K3 with a 2.7 KHz filter and
the DSP cranked down to 400 Hz will not perform as well for CW during
crowded band conditions as a K3 with a 400 Hz filter.
Hi Bill,
That point is not lost on anyone, and is the reason that serious
contesters use narrow roofing filters. I said exactly that in my earlier
response. But the point that you are missing is that the K3, K3S, and
KX3 are complete radios with the stock 2.7 kHz 5-pole or 2.8 kHz 8-pole
roofing filters, and are comparable to the receivers we have used for as
long as I have been a ham (60 years).
What's different are 1) the some of the hardware with which those older
radios and the K3/K3S/KX3 are built. Our older receivers used physical
coils and capacitors in the IF, while these newer ones simulate those Ls
and Cs in DSP; 2) the system architecture that Wayne developed (for
example, his choice of IF frequencies, his methods of reducing phase
noise, keying transients, etc.; and 3) they're a lot better radios that
most of those older ones.
A ham who doesn't participate in major contests is unlikely to need
anything more than the 2.7 or 2.8 kHz roofing filter.
73, Jim K9YC
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