I agree, I have used my K3 for almost a year now and I don't recall one situation where the NR was more effective than the filtering between my ears, whether on ssb or cw. As much as I have and continue to enjoy the radio, I must say much the same about the NB performance. It was very enlightening to hook up my FT-817 to the main station antenna the other night and find that the 817's noise blanker did a far better job than the K3's in getting rid of the interference from the electric fence which keeps the foxes away from our chickens! I don't have any DSP on my K2 so I can draw no comparison there.
On a really positive note, the one thing which makes the K3 so special to listen to (on headphones at least) is the AFX. I would not want to be without it. And in all other respects the K3 is a very fine radio indeed. 73 Stephen G4SJP K3 #980 On 27/04/2009 21:43, "WA6L" <w...@arrl.net> wrote: > > > > Hi, Roy, > > As I approach a year's ownership of the K3, I have to say that there are > very few times that I find the NR capability to be useful. On a very noisy > band and with reasonably wide bandwidths (> 800 Hz) the NR can work well, > but never without pressing the Level button and optimizing the setting each > time. > > When I compare the K3's NR with my K2's, the K2 seems far superior to me. > It may be because the K2 does its DSP at the audio instead of the IF, or it > may be that the K2 implements longer FIR filters. Whatever the reason, the > K2's noise reduction works much better and in my shack is left on almost all > the time. > > Both the K3 manual and the Wikipedia explanation of the K3 noise reduction > recommend using NR only with a wide bandwidth, and imply that it is not as > effective on SSB as it is on CW. I concur with these recommendations, but I > have to say that I agree with you. The NR implementation could have been > done much better. > > 73, > > John > > > > Roy Morris-6 wrote: >> >> When I turn on NR the audio noise level goes down. When a SSB signal is >> received the audio peaks. I have my RX EQ set flat. In these peaks there >> are resonances in my internal speaker (if I use it) as well as my two >> external speakers that plainly makes noise reduction unpleasant. It can >> be minimally tolerated at F-1-1 level with speakers. It is somewhat more >> tolerable with a good headset. Part of the problem may be in speaker >> response, but I also think a big part of the problem is in the noise >> reduction algorythms. If noise reduction is not recommended with reduced >> bandwidth in CW, and unpleasant artifacts occur in SSB; then I find NR to >> be useless. I hope the discussion of white noise and pink noise will lead >> to something that will improve the noise reduction function in the K3. >> Roy Morris W4WFB >> ______________________________________________________________ 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
