> Great - But why only 6kHz The example was using the 6 kHz AM filter. > and why can't one use the FM filter? One can. My K3 is tuned to AM broadcast right now with more than 10 kHz of IF and more than 5 kHz of AF bandwidth, using the FM filter and MCU+DSP firmware that is currently in field test. 73, Lyle KK7P