I have never found the K3 noise blanker to be effective. On the other hand, in side-by-side comparisons, the noise blanker in my old FT-1000D can be very effective on my ever present power line noise. However, like all noise blankers of that design, it only works if there are no strong signals within many kHz of the operating frequency, so it's completely useless on a crowded band. The only way around this I know of is to use a second receiver, tuned to a clear spot nearby, to control the noise blanker.
BTW, the K3 noise blanker uses a filter with a bandwidth of about 100 kHz. The idea is that, in such a wide bandwidth, the amplitude of the noise pulses should be large, making them easier to distinguish from signals. (The FT-1000 uses something like 15 kHz.) However, I've never been able to get the K3 NB to work, even on a completely dead band. Under the same conditions, I can often get a 20 dB reduction with the other radio. That I don't understand. I should investigate that sometime. 73, Scott K9MA ---------- Scott Ellington --- via iPad > On Sep 3, 2017, at 10:37 AM, Rick Tavan <r...@tavan.com> wrote: > > Noise blankers are difficult to design and to use. They work by blanking > out the receiver during noise pulses. The user defines what is a noise > pulse and how aggressively to blank it by adjusting the NB parameters. If > you don't blank out enough, you still hear the noise. If the signal is > below that noise, you won't hear it. If you blank out too much, you lose so > much real signal that it is no longer possible to copy or to copy > comfortably. *I have had very good results with the NB in the K3 on some > kinds of human-made noise.* Other noises seem to have too high a duty cycle > or signal strength to be effectively blanked. Your noise sources may be in > that category. I don't think it is fair to say the K3 NB "doesn't work." It > certainly does work on many kinds of noise. No NB that I have tried or > heard of can work on all kinds of noise. > > 73, > > /Rick N6XI > > > Rick Tavan > Truckee, CA > > On Sun, Sep 3, 2017 at 8:12 AM, Gian Luca Cazzola <glcazz...@alice.it> > wrote: > >> To Wayne and his Elecraft crew: >> >> I am an ultra satisfied cw user of a Elecraft K3S ( that I use with P3 and >> two SP3). >> >> The only things that I dont like are: >> - the noise blanker - i havent found situations where it help - or I am >> unable to use it, even if I tried lot of settings… >> >> - the NOISE REDUCTOR, that first times I thought it help barely, but after >> some time I found that it simply need to be reset (simple OFF-ON) at band >> noise changing time after time and it work well. >> >> About the NB I dont ask anything ( I simply accept that it doesn’t work), >> >> but about NR - Noise Reductor I ask you that with next firmware >> modifications you introduce an automatic NR reset ( at least every 5 >> minutes a ciclic OFF-ON, it simply improve a lot its results) >> >> Many thanks. >> >> 73 es gl, >> Ian IK4EWX >> ______________________________________________________________ >> 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 >> Message delivered to rta...@gmail.com > ______________________________________________________________ > 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 > Message delivered to k...@sdellington.us ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
