Rather than immediately switch the filters at the upper band edge, perhaps switching them 1 MHz or 500 kHz or some other number above the band edge would be practical. Or 1/2 between the ham bands, or...? A MARS station just above 40 meters, for example, would probably be better off with the 40m filters than with the 30 meter ones. 73, Lyle KK7P 1314917132.0