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 > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > -- Vic, K2VCO Fresno CA http://www.qsl.net/k2vco/ ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
