I have noticed with my sbitx the bandwidth setting below 1000khz has little overall effect. For instance, with the control set to 50hz, the BW is actually 500hz. With a setting of 400 hz, the actual BW is 800 hz. BW settings between 1000 and 50 hz change the upper cutoff, but not so much? the lower cut off frequencies. This is in the CW mode.
Barry
