Before every hijacks the topic which is focused on using crystal filters
in a dual frequency IF.
I don't have that SOTA filter. I build CW radios with narrow crystal filters or in the case of
analog I/Q phasing use analog filters of the desired bandwidth. Though I usually
add a stage of active filter in the design to reduce high frequency hiss even to
Any of the switched capacitor filters are good and there is software suitable for a faster micro
like Rpi or the STFx series to do it digitally. Just create another topic for that and not disrupt