For a great all-purpose audio filter, the MFJ-784B tunable DSP filter is hard
to beat. This one can be tuned for very narrow (down to 30 Hz) bandwidths,
which can be centered around your favorite CW offset (pitch) frequency. It has
ten memories. I have five each CW filter bandwidths saved for 550 and 600 Hz
offsets, respectively. I use it with my Omni VI/Opt. 1. It can also be used
for SSB and data signals, and it has a variable noise reduction feature as
well. Since the filters are FIR (finite impulse response) there is no phase
distortion.
The drawback is that it costs more than the SCAF filter. It's worth
considering.
73 de Chuck NI0C
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