There's one roofing filter option module, the KXFL3. It includes bandwidths of 500 and 1500 Hz for CW and DATA modes, and 3000 Hz for SSB mode. 73, Wayne N6KR On Oct 14, 2011, at 8:50 PM, W7JJL wrote: > How many roofing filters can you put into the KX3? > > Thanks > > John > W7JJL