I have the 2.9, 1.9, .500 and .200 KHz filters. All are 8-pole with the
exception of the 200cps filter from Elecraft which is 5-pole. I bought
the 500KHz 8-pole directly from Inrad since the 400cps filter seemed too
close to the .200KHz for my taste, and because there has been [in the
past] some chatter here on the reflector to the same effect. All filters
in the K3 provide adjacent channel protection, while the DSP filter(s)
provides the final selectivity. If you're not interested in contesting,
then the 8-pole narrow filters are probably not that important. My
general sense is that 8-pole filters, while overkill in many situations,
are not so much more expensive and give one state of the art filtering
that stands up over time. While I don't know for sure, I'm under the
impression that they are also easier to sell if one wants to go in
another direction. I'd probably go with the .400KHz 8-pole which no
doubt will serve you well in casual CW.
...robert
On 1/5/2013 18:36, ac8jd wrote:
I am ready to pull the trigger on a CW filter for my K3. I am curious to
hear opinions of others who have used the 8 pole 400hz filter and the 5 pole
500hz filter. I am not a contester by any means so this is for casual CW
operating.
All thoughts and opinions are welcome!
Thanks!
AC8JD
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Robert G Strickland, PhD ABPH - KE2WY
verizon.net.usa
Syracuse, New York, USA
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