As a brand new K3 user, I find some of the NR DSP settings quite perplexing. In working some nets, e.g. MARS, I've found some stations' audio almost totally suppressed, while others enhanced. Unfortunately, this process is not consistent, but changes as the "noise picture" changes. Trial and error methodology rules the day here.
On a lighter note, an algorithm that consistently suppresses an individual station could come in handy. Certainly would consider a 2M XVTR module to run on our local repeater! I would be interested if there's a "White Paper" somewhere on the Elecraft web site, (or elsewhere), with an in-depth explanation of what the various settings do. 73, Dan WA6PZK On 9/29/11 8:51 PM, "Don Wilhelm" <w3...@embarqmail.com> wrote: > The K3 noise blanker, and in fact any noise blanker works by producing > "holes" in the receive path. That is what blanking means - if an > impulse is detected, it shuts off the receive path for a specified > period of time. > > That will not "take away" from the reception of faint signals, but if > combined with gaps in the received signals because of impulse events > occurring at the receiving station, it may make the copy of faint > signals difficult because of the blanks in the received data stream. > > In my opinion, it should only be used when necessary, not all the time. > If you have constant static pulses or automotive ignition noise or > distant lightning surge problems at your QTH, then it may be beneficial > to run the NB at all times, but if you do not need it, keep it off. > Remember that the NB responds to impulse noise - it will not be > effective in reducing slow rise time noise like atmospheric noise or > power-line induced noise. NB needs a fast rise time to be effective. > > NR is a different animal altogether. It will reduce or eliminate things > like atmospheric noise or power line noise - it works on correlation > principles. That means is it is normally quiet while it looks for what > might be a valid signal. When it finds something that appears to be a > valid signal, it builds a filter around it and sends that result to the > K3 audio. What it looks for is highly dependent on the parameters set > for the K3 NR algorithm as well as your local noise. There are several > settings provided for in the menu. Do a little experimenting with your > chosen mode and local noise situation until you discover what works best > for you. The settings for CW will likely not be good for SSB. Try the > settings to find which works for your particular situation. This is not > a case of "one size fits all", customize it to your particular noise > source. With NR on, the desired signal should be enhanced, but really > weak signals may be at or near the noise level, and may not appear as a > valid signal, giving the appearance that weak signals may be covered up > and not detected. I suggest (after experimenting) that you normally run > with NR turned off, but turn it on if the situation warrants it. > > 73, > Don W3FPR > > On 9/29/2011 12:15 PM, tomb18 wrote: >> Hi, >> I was wondering if anyone could give me some hints as to the best way to use >> the NB and the NR? >> Most of the time I use the nr and there seems to be little effect of the nb >> (maybe one-two s units?) Does the nb take away from faint signals? If not >> should I always just use it? >> > ______________________________________________________________ > 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 ______________________________________________________________ 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
