K3: Noise Reduction - FWIW
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I have read with interest the e-mails regarding the K3 noise reduction feature. I will post my observations herewith. It took a bit of work to find the "sweet spot" setting for my noise environment. Once found, it has proven to be quite satisfactory. Having worked with a number of SDR type of radios (Flex, Yaesu, and now K3 and for that matter K2) I can say that, in my opinion, the K3 is as good as it gets. I sense a number of users may not be entirely familiar with noise reduction as it pertains to a software defined radio. In some cases, it seems one is trying to use noise reduction where one should be using noise blanking, a common mistake in attempting to reduce impulse noise from power lines. Another common mistake would be to solicit the settings from another user in a different noise environment.
One resource I found to be of benefit to me in helping me to understand the "processes" of DSP is "The Engineer's Guide to Digital Signal Processing" by Steven W. Smith. It is a free download from http://www.dspguide.com. 73s, Jim, W4ATK ______________________________________________________________ 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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Jim
Yaesu set a new standard with the 5000 series like nothing prior that they ever had. As for the Flex IMHO that needs to go to a computer forum as that is what it is and yes I know all the hype it's the mouse and no KNOBS! -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of W4ATK Sent: Wednesday, November 07, 2012 1:16 PM To: Elecraft Reflector Subject: [Elecraft] K3: Noise Reduction - FWIW I have read with interest the e-mails regarding the K3 noise reduction feature. I will post my observations herewith. It took a bit of work to find the "sweet spot" setting for my noise environment. Once found, it has proven to be quite satisfactory. Having worked with a number of SDR type of radios (Flex, Yaesu, and now K3 and for that matter K2) I can say that, in my opinion, the K3 is as good as it gets. I sense a number of users may not be entirely familiar with noise reduction as it pertains to a software defined radio. In some cases, it seems one is trying to use noise reduction where one should be using noise blanking, a common mistake in attempting to reduce impulse noise from power lines. Another common mistake would be to solicit the settings from another user in a different noise environment. One resource I found to be of benefit to me in helping me to understand the "processes" of DSP is "The Engineer's Guide to Digital Signal Processing" by Steven W. Smith. It is a free download from http://www.dspguide.com. 73s, Jim, W4ATK ______________________________________________________________ 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 |
Re: K3: Noise Reduction - FWIW
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In reply to this post by Jim Rogers, W4ATK
Jim makes some superb points here.
The fundamental question is: What noise are you trying to eliminate? Not all noises are created equal, neither are all signals. In my business we are also fond of saying "One man's signal is another man's noise." This question dictates the design of your (receive) antenna system all the way to the choice of radio, IF and digital filters, etc. Not having read KE7X's book myself (it's on my Christmas list), I cannot be sure how the NR filters in the K3 are implemented. However, appearances are that you select a type of filter and then the agressiveness of that filter. This seems to me that is fundamentally more powerful than the lauded one-knob approach of the FTDX-5000 if the filter you have selected was designed to eliminate the type of noise you are experiencing from the kind of signal you are receiving. I do hope to learn how this is implemented in the K3 and hopefully exploit it to my advantage in the future. Another point---I seem to recall coming across something in the K3 User's Manual about the NR filters being optimized for use in a CW bandwidth (I forget what the exact number was 250-500 Hz or something). If that is the case, then no wonder they don't work in SSB bandwdiths! This is fundamental signal processing. It has little to do with the power the DSP chips or the efficiency of the DSP algorithms. Based on my limited knowledge of noise reduction techniques useful for amateur radio, SSB is a considerably more challenging problem than CW. And it is one the JAs must have apparently mastered. I suspect that they also choose filters based on the bandwidth and mode selected in the radio and it's just transparent to the user. Like Jim, I have been relatively satisfied with the NR in my K3 so far, probably because 1. I'm principally a CW operator, 2. I use it sparingly, 3. I choose to address my noise problems at RF when possible, and 4. I have no interest in buying a $5000 radio that doesn't fit in hand luggage. 73, --Ethan, K8GU/3. On Wed, Nov 7, 2012 at 2:15 PM, W4ATK <[hidden email]> wrote: > I have read with interest the e-mails regarding the K3 noise reduction feature. I will post my observations herewith. It took a bit of work to find the "sweet spot" setting for my noise environment. Once found, it has proven to be quite satisfactory. Having worked with a number of SDR type of radios (Flex, Yaesu, and now K3 and for that matter K2) I can say that, in my opinion, the K3 is as good as it gets. I sense a number of users may not be entirely familiar with noise reduction as it pertains to a software defined radio. In some cases, it seems one is trying to use noise reduction where one should be using noise blanking, a common mistake in attempting to reduce impulse noise from power lines. Another common mistake would be to solicit the settings from another user in a different noise environment. > > One resource I found to be of benefit to me in helping me to understand the "processes" of DSP is "The Engineer's Guide to Digital Signal Processing" by Steven W. Smith. It is a free download from http://www.dspguide.com. > > 73s, Jim, W4ATK > ______________________________________________________________ > 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 -- http://www.k8gu.com/ Repair. Re-use. Re-purpose. Recycle. ______________________________________________________________ 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 Jim Rogers, W4ATK
HI Jim,
Would be so kind as to share your settings that give you a sweet spot and what is the nature of the noise that drove you to that setting. Thanks in advance. Don ~73 Don KD8NNU -----Original Message----- From: W4ATK Sent: Wednesday, November 07, 2012 2:15 PM To: Elecraft Reflector Subject: [Elecraft] K3: Noise Reduction - FWIW I have read with interest the e-mails regarding the K3 noise reduction feature. I will post my observations herewith. It took a bit of work to find the "sweet spot" setting for my noise environment. Once found, it has proven to be quite satisfactory. Having worked with a number of SDR type of radios (Flex, Yaesu, and now K3 and for that matter K2) I can say that, in my opinion, the K3 is as good as it gets. I sense a number of users may not be entirely familiar with noise reduction as it pertains to a software defined radio. In some cases, it seems one is trying to use noise reduction where one should be using noise blanking, a common mistake in attempting to reduce impulse noise from power lines. Another common mistake would be to solicit the settings from another user in a different noise environment. One resource I found to be of benefit to me in helping me to understand the "processes" of DSP is "The Engineer's Guide to Digital Signal Processing" by Steven W. Smith. It is a free download from http://www.dspguide.com. 73s, Jim, W4ATK ______________________________________________________________ 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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I know we all have our own unique noise environment but I am curious what settings others use for reducing the background noise on SSB. Not for really digging into a noise issue but for just reducing the background noise for comfortable listening. I have been playing around with the different settings and found F4-1 or F5-1 seem to be decent. Still experimenting. I use a 2.8 kHz bandwidth to start and then narrow down as need be. I have the 1.8kHz filter installed for SSB. Bob K6UJ ______________________________________________________________ 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 |
K3 DSP NR for SSB, settings you like ?
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Hello Bob,
I used the similar settings as yours but still feel that in SSB, Icom's NR is better and more comfortable to listen. I have 2.7Khz filters for SSB. TNX & 73, Johnny VR2XMC ________________________________ 寄件人︰ Bob K6UJ <[hidden email]> 收件人︰ Elecraft Reflector <[hidden email]> 傳送日期︰ 2012年11月8日 (週四) 9:33 AM 主題︰ [Elecraft] K3 DSP NR for SSB, settings you like ? I know we all have our own unique noise environment but I am curious what settings others use for reducing the background noise on SSB. Not for really digging into a noise issue but for just reducing the background noise for comfortable listening. I have been playing around with the different settings and found F4-1 or F5-1 seem to be decent. Still experimenting. I use a 2.8 kHz bandwidth to start and then narrow down as need be. I have the 1.8kHz filter installed for SSB. Bob K6UJ ______________________________________________________________ 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 |
Re: K3: Noise Reduction - FWIW
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In reply to this post by Jim Rogers, W4ATK
Jim,
I know the difference between NB and NR, no worries :-) Thanks very much for that pointer to the DSP guide. Nice! 73 Arie PA3A Op 7-11-2012 20:15, W4ATK schreef: > ..... > I sense a number of users may not be entirely familiar with noise reduction as it pertains to a software defined radio. In some cases, it seems one is trying to use noise reduction where one should be using noise blanking, a common mistake in attempting to reduce impulse noise from power lines. > ............. > One resource I found to be of benefit to me in helping me to understand the "processes" of DSP is "The Engineer's Guide to Digital Signal Processing" by Steven W. Smith. It is a free download from http://www.dspguide.com. > > 73s, Jim, W4ATK ______________________________________________________________ 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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