The current KSB2 from Elecraft has already been modified with less ripple
in the pass band. My KSB2 is an earlier model and has been modified to
2.4khz based on a kit supplied from Elecraft. Under the spectrogram, I
notice that the latest configuration gives a fairy flat response across
pass band.
I feel the trick of getting good audio is to tune your filter by using the
spectrogram. K2 is still a very good rig in SSB though there is a lack of
IF shift. However, you need to experiment with different microphones to
get better audio. With limitations in design, size, K2 in SSB is still
unbeatable in its price category. My remarks are limited to RX performance
in the survival under strong QRM situation like the CQ WW SSB contest.
Clearly, you will miss the functions like manual notch within AGC, IF shift
etc etc. K2 is still a very capable rig in SSB mode. If you install the
KDSP2, you will need to experiment the change in Denoiser settings to
lessen the artifacts.
cheers,
Johnny Siu VR2XMC
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