Martin, The DSP filters will handle most filtering needs for signals less than S9+20 to S-9+30. However when the signals within the roofing filter passband are greater than that level, the hardware AGC will be activated and you will experience 'pumping' of the receiver gain even though you are not hearing the signals within the roofing filter passband, but outside the DSP filter passband.
So, consider the signal strength of signals that you are likely to encounter during your periods of contesting and DXing, and that will tell you which filters you will need. If you want insurance against nearby strong signals, you may want a filter in the 250 Hz range as well as one in the 400 Hz range for more casual CW operation. For SSB, go for the 1.8 filter in addition to the 2.7 or 2.8 kHz filter if you will be receiving in very crowded band conditions. I personally do h\not think the 2.1 kHz filter offers much advantage over the 2.7 standard filter. If you do not have the subRX installed, changing/adding filters is not a big deal, so you may want to go with the minimum set until you get a feel for what you actually need. With the subRX installed, you must lift the subRX assembly to install filters in the main K3 board. 73, Don W3FPR Martin Schmiedel wrote: > Elecrafters, > i am about to order filters for my K3 and would like to hear from the > group what filters i should go for. > I am a ragchewer as well as a contester, ssb & cw. Rarely data modes. > I do weak signal work on 160/80 cw. > I have > 2.8khz ssb in main & sub > 400hz cw in main & sub > Should i order the 200hz 5-pole filter for their narrower bandwith or > the 250hz 8-pole with steeper skirts? Add 2.1khz or 1.8khz for ssb? > What is your recommendation? > Should i add filters for both rx's (-> diversity) ? > If i go for the 5-pole filters,should they be matched by elecraft or is > there a method to tweak it in the K3 ? > > Thanks > > Martin > > -- > > 73, DM4iM > > > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ------------------------------------------------------------------------ > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 9.0.722 / Virus Database: 270.14.121/2589 - Release Date: 12/27/09 > 04:18:00 > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
