Posted by
Earl W Cunningham on
Jul 23, 2004; 2:59am
URL: http://elecraft.85.s1.nabble.com/KAF2-v-KDSP2-tp369054p369055.html
I've used both the KAF2 and KDSP2 with my K2 and can offer these
comments:
For the noise reduction feature of DSP to work well requires a wide
bandwidth. That is why any DSP unit is less effective in the NR
department on CW than it is on SSB.
Personally, I like very narrow BWs when working CW because it enables me
to hear the weak signals better. The KDSP2 does a very good job in
giving me a very narrow BW with reasonably steep skirts, however that
narrow BW makes its NR feature totally ineffective. In contrast, when
using the wide BWs necessary for SSB work, the KDSP2's NR feature works
incredibly well.
Comparing the KDSP2 with the KAF2 on CW, I prefer the KDSP2 because I can
set its BW very narrow and therefore dig the weak ones out of the mud
better than I can with the KAF2.
Now, if only my K2/100 had a mu-metal shield around it so that I could
use it with my linear amplifier without degrading its transmit signal
(the hypersil HV xfmr in the amp puts out a BIG electromagnetic field at
60 Hz which puts hum into the PLL oscillator circuit in the K2 unless
they are separated by an unreasonably large distance).
73, de Earl, K6SE
K2 #2622
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