[Elecraft] K3 5 pole vs 8 pole filters - attenuation in the passband

[Scott Ellington]

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

k9ma at sdellington.us