Noise Blanker Problems
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Using the latest Beta Firmware I notice distortion on the audio when using the noise blanker even on low settings. This applies whether dsp or if or both are used. On reverting to Firmware 4.14 no such distortion occurs. Anyone else have similar problems?
Dave G0AIX ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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* On 2010 04 Dec 09:05 -0600, David wrote:
> Using the latest Beta Firmware I notice distortion on the audio when using the noise blanker even on low settings. This applies whether dsp or if or both are used. On reverting to Firmware 4.14 no such distortion occurs. Anyone else have similar problems? Yes, I've noticed the distortion, but have not reverted to an older firmware to test. I have noticed it on particularly strong voice signals on the lower bands, but every other radio I've owned does the same thing so I thought nothing of it! 73, de Nate N0NB >> -- "The optimist proclaims that we live in the best of all possible worlds. The pessimist fears this is true." Ham radio, Linux, bikes, and more: http://n0nb.us/index.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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The mechanisms of noise reduction nearly all result in artifacts of
some sort, which a given individual would describe as distortion Removing anything "unpleasant" from the RF off the antenna while surfacing a perfectly formed SSB audio which was formerly buried in the unpleasantness and totally unintelligible, or even so weak it was not noticed, is the holy grail of noise reduction. I've set right beside someone who called a signal "distorted" and I could not hear it. It's all in the ear of the beholder. Some recordings of the audio posted to a web page and linked from an email here would be useful. 73, Guy. On Sat, Dec 4, 2010 at 10:09 AM, Nate Bargmann <[hidden email]> wrote: > * On 2010 04 Dec 09:05 -0600, David wrote: >> Using the latest Beta Firmware I notice distortion on the audio when using the noise blanker even on low settings. This applies whether dsp or if or both are used. On reverting to Firmware 4.14 no such distortion occurs. Anyone else have similar problems? > > Yes, I've noticed the distortion, but have not reverted to an older > firmware to test. I have noticed it on particularly strong voice > signals on the lower bands, but every other radio I've owned does the > same thing so I thought nothing of it! > > 73, de Nate N0NB >> > > -- > > "The optimist proclaims that we live in the best of all > possible worlds. The pessimist fears this is true." > > Ham radio, Linux, bikes, and more: http://n0nb.us/index.html > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by David
I don't think I've ever had a rig that didn't cause SOME noticeable distortion
when used with SSB, but then 88% of my lifetime QSO's have been in CW Mode. Using the lowest settings possible is a good way to reduce the distortion, but it won't completely go away, since it works by chopping out the noise it is blanking (even on CW). 73, Tom Childers Radio Amateur N5GE Licensed since 1976 QCWA Member 35102 ARRL Life Member On Sat, 4 Dec 2010 15:03:40 -0000, "David" <[hidden email]> wrote: >Using the latest Beta Firmware I notice distortion on the audio when using the noise blanker even on low settings. This applies whether dsp or if or both are used. On reverting to Firmware 4.14 no such distortion occurs. Anyone else have similar problems? > >Dave G0AIX >______________________________________________________________ >Elecraft mailing list >Home: http://mailman.qth.net/mailman/listinfo/elecraft >Help: http://mailman.qth.net/mmfaq.htm >Post: mailto:[hidden email] > >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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Amateur Radio Operator N5GE
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In reply to this post by David
Dave,
It's also my impression that the DSP noise blanker introduces more distortion on SSB signals in Firmware 4.22 than in previous firmware. I haven't rolled back to a previous version to check it out like you have but I will next week. Anyone else notice this? 73 to all Geoff G3UCK ----- Original Message ----- From: "David" <[hidden email]> To: <[hidden email]> Sent: Saturday, December 04, 2010 3:03 PM Subject: [Elecraft] Noise Blanker Problems > Using the latest Beta Firmware I notice distortion on the audio when using > the noise blanker even on low settings. This applies whether dsp or if or > both are used. On reverting to Firmware 4.14 no such distortion occurs. > Anyone else have similar problems? > > Dave G0AIX ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Yes Geoff, 4.22 appears effect the DSP NB more here with me also.
I rarely use it but in the last few days I have been trying it out and I am noticing a lot more artifacts than before. 73's Gary On Sun, Dec 12, 2010 at 5:29 AM, Ron D'Eau Claire <[hidden email]> wrote: > Not here Geoff, but I can't really tell. I assume there will be distortion > any time one goes "whacking great holes" in the spectrum of a signal to > blank noise pulses, and that will vary widely based on the strength of the > signal, presence of nearby signals and many other factors. > > IIRC the exact nature of the process based on the settings for the NB in > the > K3 has changed from firmware rev to firmware rev too. > > Ron AC7AC > > -----Original Message----- > > Dave, > > It's also my impression that the DSP noise blanker introduces more > distortion on SSB signals in Firmware 4.22 than in previous firmware. I > haven't rolled back to a previous version to check it out like you have but > I will next week. > > Anyone else notice this? > > 73 to all > > Geoff > G3UCK > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > -- Gary VK4FD - Motorhome Mobile http://www.qsl.net/vk4fd/ K3 #679, P3 #546 For everything else there's Mastercard!!! ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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