I have both the 8 pole 400 Hz and 250 Hz filters. For CW, I just
haven't found the 250 Hz filter that useful. For one thing, it's not
really that much narrower than the 400 Hz filter. I do find that a
bandwidth less than 400 Hz is sometimes useful in heavy QRM, but I think
the 400 Hz filter and DSP would be adequate. If I were to do it over
again, I would not buy the 250 Hz filter, at least not before trying
without in a few contests.
73,
Scott K9MA
On 2/27/2016 09:56, lstavenhagen wrote:
for what it may be worth, the 400hz 8 poles in my K3 and K3S are like brick
walls. I haven't yet found a situation where the 400hz filter plus using the
DSP to go narrower hasn't covered even the most crowded situations.
I'm 99.9986% CW, so that filter is adequate for me but if you're a PSK
hound, for example, I could see the 250hz filter. For RTTY, I think the
250hz filter might be borderline, though...
Just my thoughts,
LS
W5QD
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Scott Ellington K9MA
Madison, Wisconsin, USA
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