I recently added this filter to my K3 to go with the 2.7 KHz and 500 Hz filters it already has. These are roofing filters so there is a question of whether or not they're needed - or even if they make a difference you can hear. I've spent time tuning the bands (mostly 40) with my filter width set to 1.1 KHz and 1.0 KHz, listening to the difference as the crystal filter is engaged. Is it needed? I'd usually no. Does it make a difference? Most definitely! I greatly prefer to operate with the 1.0 KHz filter engaged. I can keep my DSP bandwidth wider while still rejecting noise from 2 KHz away. The overall level of grunge in the receiver goes down when the crystal filter kicks in. I used to run with the DSP set to about 700 Hz to get the overall sound I wanted. With the crystal filter, I can open the DSP to 1000 Hz and get the same or more rejection of signals several KHz away. - Keith N1AS - - K3 711 -
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