[Elecraft] [K3] Noise on wsjt-x waterfall

[Bill Frantz]

I have a K3 which has been upgraded to have the Elecraft 
internal USB sound card.

I tried adjusting the DSP bandwidth when running FT8 to 
eliminate a strong signal above the FT8 subband and noticed that 
there was a strong noise bar on the water fall for about 400 Hz 
below the high cutoff. Further playing with the controls showed 
a similar noise bar just above the low cutoff. Note that these 
noise bars are in the requested pass band.

Has anyone else observed this noise? Does anyone have an explanation?

73 Bill AE6JV

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