K0PP:
>Mine has 6, 2.8, 2.1, 1 and .4 kHz 8-pole roofing filters.
>It's amazing that I can move from the widest to the narrowest
filter with a twirl of the "Width" control while tuned to a CW
signal ... using the NEAT "CWT" feature ... and not hear any
sign that I've (actually, the radio) has switched through five filters.
>There is -NO- ringing. Impressive!
There is definitely a little ringing in the 50 Hz
DSP setting...as there should be. I haven't yet measured the
DSP BWs but I have a feeling Elecraft's WIDTH settings are
accurate at the low end, unlike Ten-Tec or Icom, who tend to
overstate DSP filter performance. I recall Orion's "100 Hz"
is actually more like 150 Hz, and the 756 Pro family's "50 Hz"
is more like 80 Hz. When you hear someone say "I have no
ringing at 50 Hz", it probably means the filter BW is actually
NOT what the radio says it is. So far the K3 impresses me as
a radio designed by engineers...and not marketeers.
73, Bill W4ZV
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