Mike, If you do any contesting or if you want to operate during a contest, roofing filters are the way to go. As I get older the "pumping" noise from adjacent signals has become ever more distracting. The rig I used for the California QSO party was new and had a Collins 500Hz "virtual" roofing filter. During the contest some stations could copy me but I could not copy them due to the pumping generated by adjacent signals. I now use a K3 with "real" 2.8 kHz, 1.8 kHz and 400 Hz roofing filters. The improvement was dramatic. 73, Fred, AE6IC.
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