Hi Ray, I'm not an expert on the DSP, but my K2 has one and I'm happy with it. To answer your questions:
1. The CW filters, like the SSB and RTTY filters are activated by using the AFIL button on the front panel. nr = noise reduction I think the DSP filter comes already configured, although I'm not positive about that because I didn't buile mine either. Hopefully, some smarter person will jump in and help. Regardless, you can cownload a copy of the KDSP2 manual from the Manuals and Downloads section of the Elecraft website. It will tell you how to configure and use the filter. 2. The settings shown are perfectly good. The manual explains what everything means. My interpretation is that the left hand number is the frequency where the low pass filter kicks in and the right hand number is the bandwidth...1 kHz for general uncrowded conditions and 200 Hz during contests when the band is packed with signals. 3. The noise reduction works well on CW signals, although it softens them somewhat, which some people don't like. But it does get rid of a lot of noise! There are several "strengths" to which the noise reduction can be set. I've always found the lowest setting to be the best but that's a personal preference. Noise reduction isn't available with the RTTY filters because it degrades the signal too much and makes decoding difficult. Definitely download yourself a copy of the manual! Happy New Year, Ken Alexander VE3HLS On 03/01/2012 6:47 AM, Ray G3XLG wrote: > I am the 2nd owner of my K2 and have so far largely "ignored" the DSP filter > but I thought I'd look into it further following my poor performance in a > recent RTTY contest where some contacts were difficult but eventually OK and > others were unable to decode my signals at all. > So far I have found the DSP filter settings currently in the K2 are as > follows: > SSB > S1. .00 2.9 > S2. .20 .2.5 > S3. .30 .1.9 > S4. .30 .1.6 > Which I understand show that the denoiser is not currently activated, the > notch is on and the other figures are the lower& upper cutoff frequencies > in kHz. > CW > CF1 nr > CF2 nr > CF3 nr > CF4 nr > So it appears my DSP is not active on CW? > RTTY > r1 LPA.SS > r2 2.5 .1.0 > r3 2.2 .30 > r4 1.0 .20 > I think this shows the centre frequencies of 1 to 2.5kHz& the width of 0.2 > to 1.0kHz with filters r2, r3& r4? > > My questions are: > - why would the CW filters not be active& what does "nr" mean? > - what are typical DSP settings for RTTY, and are the ones in use OK? > - any other comments re these settings? > > Still learning about this rig! > 73 > Ray, G3XLG > > > ----- > Ray G3XLG > -- > View this message in context: > http://elecraft.365791.n2.nabble.com/Trying-to-get-to-grips-with-the-KDSP2-Filter-tp7146478p7146478.html > Sent from the Elecraft mailing list archive at Nabble.com. > ______________________________________________________________ > 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 > > ______________________________________________________________ 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
