[Elecraft] K3 for CW

[Vic K2VCO]

I get the feeling from reading all of these messages that most of the writers do not 
understand the function of the filters in the K3. I know that AC7AC, W3FPR and others have 
explained it, but it doesn't seem to sink in.

The ONLY time you need a narrower filter is when there is a signal that is about S9+20 or 
greater that is outside the DSP bandwidth that you have selected but still within the 
bandwidth of the selected filter.

So if you have a 2.8 kHz filter and you have your DSP bandwidth set to 200 Hz then unless 
there is a *very* loud signal that is within 2.8 kHz, it will not be much different from 
what you would hear with a 200 Hz filter.

I say 'much' because the effect of concatenating the DSP and the sharp filter will change 
the shape of the bandpass a little.

I always advise CW operators to get the 400 Hz filter. Situations in which they will need 
a sharper one will be rare.

On 7/5/2012 12:03 AM, Arie Kleingeld PA3A wrote:
> Don,
>
> It seems that  you are an experienced CW op.
> See the selection of filters no different from other transceivers where
> xtal filters determine the BW.. Just pick your favourite BWs.
>
> For CW I have 400Hz en 200Hz in main RX  and 400Hz in SubRx to enable
> diversity mode.
> I use the 400Hz filter 99% of the time. The 200Hz only comes into play
> when I need to dig a signal out, often in combo with the APF.
>
> 73
> Arie PA3A
>
> Op 5-7-2012 1:36, Don KB1YBG schreef:
>    I've been following P3, 2nd Rcvr here but am not ready for those yet.
>    My question is 1) best filters for CW and 2) any other must-have
> options. I've read Wayne's article about filter selection but still
> unsure. It seems the 400 and 250 may be close to same and 1000 and 400 a
> better choice. Or 500 5-pole? I'll be adding Sec Rx so what about filter
> matching? 73, Don,  KB1YBG
>
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-- 
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/