> Thanks for the replies but I can see no valid reason for using either CW or CWR mode and there is > no advantage in using the narrow CW filters. CW / CWR places the BFO on opposite sides of the signal. CWR is the correct setting if you would like the frequency range of Argo, Spectrum Lab etc to display correctly. Jay W1VD WD2XNS WE2XGR/2