I must be confused by this filter discussion. Is not a Nyquist filter by
its very definition a digital filter? Not directly comparable to the
crystal filters in the K3 or any other rig.
I would have supposed a Nyquist filter is one that samples at least
twice per cycle at the highest observed frequency.
As to what comes out of crystal filters, i.e. rtty tones, different
discussion. If I have the processing chain figured correctly crystal
filter output is then sampled by the audio card.
I'm not a filter designer. Just asking based on previous experiences.
73 Art
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