This is an interesting discussion.
Before I purchased my K3 in 2008, I had become addicted to narrow
selectivity with my previous rigs, and was routinely tuning the bands
with cascaded 250 Hz filters. Since I'm nearly 100 pct. CW, I purchased
a range of crystal roofing filters to try out in my K3. I have the 700
Hz (special order), 400, 250 and 200 Hz filters. I'm primarily a low
band DX'er and like the flexibility of all these filters ahead of the
K3's marvelous IF DSP variable filter in order to deal with varying band
conditions.
Lately, though, I've been using the 700 Hz and 400 Hz roofing filters
almost exclusively. The K-3's DSP APF does a great job in peaking up
stations near the noise level.
I also employ the DXE NCC-1 noise cancelling unit with optional matched
receive bandpass filters installed for my favorite DX bands. This unit
provides additional attenuation and really helps augment the K3's
already super dynamic range.
73,
Chuck NI0C
KX1, K2-10, K-3, P-3
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