Re: [Elecraft] NR Revisited (trying again in plain text mode)
We're going to make NR per-mode in the next firmware release, too. This should eliminate the need to hunt for the ideal setting each time you change modes. 73, Wayne N6KR On Dec 29, 2009, at 5:17 PM, Chuck Guenther wrote: I've been pleasantly surprised at how well NR works even with very narrow CW bandwidths. I routinely use a 250 Hz roofing filter followed by 250, 200, or 150 Hz DSP filters for Top Band. The NR set around F1-2 or F1-3 quite often makes a difference for me. It wasn't always this way. Thanks to Elecraft for their continual upgrades via firmware! 73, Chuck NI0C K2-10 s/n 5853 K3 s/n 1061 Joe, KB8AP, wrote: NR works best with wider bandwidths. __ 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
Re: [Elecraft] NR Revisited (trying again in plain text mode)
COOL!! finally,I was waiting for that long time,separate setings per mode for NR,thanks wayne and I wish you and all Elecraft members team,a happy,healthy and lucky new year. Hector AD4C For a refined ham it is compulsory to own a k3 --- On Wed, 12/30/09, Wayne Burdick n...@elecraft.com wrote: From: Wayne Burdick n...@elecraft.com Subject: Re: [Elecraft] NR Revisited (trying again in plain text mode) To: Chuck Guenther charles9...@att.net Cc: elecraft@mailman.qth.net Date: Wednesday, December 30, 2009, 5:54 PM We're going to make NR per-mode in the next firmware release, too. This should eliminate the need to hunt for the ideal setting each time you change modes. 73, Wayne N6KR On Dec 29, 2009, at 5:17 PM, Chuck Guenther wrote: I've been pleasantly surprised at how well NR works even with very narrow CW bandwidths. I routinely use a 250 Hz roofing filter followed by 250, 200, or 150 Hz DSP filters for Top Band. The NR set around F1-2 or F1-3 quite often makes a difference for me. It wasn't always this way. Thanks to Elecraft for their continual upgrades via firmware! 73, Chuck NI0C K2-10 s/n 5853 K3 s/n 1061 Joe, KB8AP, wrote: NR works best with wider bandwidths. __ 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 __ 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
Re: [Elecraft] NR Revisited (trying again in plain text mode)
Dear Wayne, Its great ! Many thanks for your efforts. Bst 73's Philippe A65BI K3#3616 Wayne Burdick n...@elecraft.com 30-12-2009 21:54 We're going to make NR per-mode in the next firmware release, too. This should eliminate the need to hunt for the ideal setting each time you change modes. 73, Wayne N6KR On Dec 29, 2009, at 5:17 PM, Chuck Guenther wrote: I've been pleasantly surprised at how well NR works even with very narrow CW bandwidths. I routinely use a 250 Hz roofing filter followed by 250, 200, or 150 Hz DSP filters for Top Band. The NR set around F1-2 or F1-3 quite often makes a difference for me. It wasn't always this way. Thanks to Elecraft for their continual upgrades via firmware! 73, Chuck NI0C K2-10 s/n 5853 K3 s/n 1061 Joe, KB8AP, wrote: NR works best with wider bandwidths. __ 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 __ 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] NR Revisited (trying again in plain text mode)
Over the past two months I've been enjoying weak signal low band DXing on good antennas with my K3 using roofing filters for CW (500Hz) and SSB (2.1 KHz) . My K3 has the latest DSP board and the firmware is up to date with the thirty-two(?) NR choices. What I'm finding is that the NR Firmware likes to see a wide bandwidth from which the weakest signals can be dug out of the in the noise on SSB or CW. If I narrow up the bandwidth with the optional filters I can't copy the signals as well. i.e. with NR enabled together a 2.1 or 500 Hz filter. I hear best with NR together with the 2.7 KHz filter. Interesting! This means that QRM must be considered as a secondary matter within the bandpass if the NR feature is to work at its best for me. I find different NR settings depending on band conditions and the ultimate setting varies with incoming signals. I've been working lots of JAs on 80 meters where the NR truly helps. The narrow CW/SSB filters are great but I don't use NR with them. Weak signal reception comes down to using the narrow roofing filters without NR. OR, just the 2.7 KHz wide filter with NR enabled. Yes, over and over, the 2.7 KHz bandwidth together with NR brings them out from the depths of ESP level to readable signals. So, why have the optional filters? I use them to get signals so I can copy them through QRM when the band is busy. . Happy Holidays 73, John, W1QS __ 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
Re: [Elecraft] NR Revisited (trying again in plain text mode)
The DSP is behind the roofing filters. I set my 400 Hz filter to cut in at 450 Hz width. If I set width to 500, the K3 uses the 1.8 kHz roofing filter. The information diversity of the noise vs CW signal as a ratio is much larger there and the algorithm seems to take advantage of that. To my ears there is a lot more bite by the NR when the roofing is wide. This wide roofing won't do for contests, but it's quite nice for listening and regular QSO's. In your case I would compare NR with width at 550 and 500 for CW in uncrowded non-contest situations. That should tell you a lot. In any event, at some level of signal going down past merely weak, NR no longer digs into the noise and IMHO begins to obfuscate the signal. At this point only narrowing bandwidth helps. I never use the NR in contests for this reason. NR seems to kill about a couple dB range where I can dig it out with the dB between the ears if the NR is off. In a contest, those are the very contacts that if made will put distance between one and the competition. And lest anyone think that a dig on the K3, I have exactly the same observation/experience on the Orions. 73, Guy On Tue, Dec 29, 2009 at 12:53 PM, John Lawrence j...@hughes.net wrote: Over the past two months I've been enjoying weak signal low band DXing on good antennas with my K3 using roofing filters for CW (500Hz) and SSB (2.1 KHz) . My K3 has the latest DSP board and the firmware is up to date with the thirty-two(?) NR choices. What I'm finding is that the NR Firmware likes to see a wide bandwidth from which the weakest signals can be dug out of the in the noise on SSB or CW. If I narrow up the bandwidth with the optional filters I can't copy the signals as well. i.e. with NR enabled together a 2.1 or 500 Hz filter. I hear best with NR together with the 2.7 KHz filter. Interesting! This means that QRM must be considered as a secondary matter within the bandpass if the NR feature is to work at its best for me. I find different NR settings depending on band conditions and the ultimate setting varies with incoming signals. I've been working lots of JAs on 80 meters where the NR truly helps. The narrow CW/SSB filters are great but I don't use NR with them. Weak signal reception comes down to using the narrow roofing filters without NR. OR, just the 2.7 KHz wide filter with NR enabled. Yes, over and over, the 2.7 KHz bandwidth together with NR brings them out from the depths of ESP level to readable signals. So, why have the optional filters? I use them to get signals so I can copy them through QRM when the band is busy. . Happy Holidays 73, John, W1QS __ 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
Re: [Elecraft] NR Revisited (trying again in plain text mode)
Hi John, Exactly so. Lyle Johnson explained how NR works in the K3 a while ago and he said exactly what you've observed: NR works best with wider bandwidths. You can see his explanation at http://www.zerobeat.net/mediawiki/index.php/K3_DSP 73 -- Joe KB8AP On Dec 29, 2009, at 9:53 AM, John Lawrence wrote: What I'm finding is that the NR Firmware likes to see a wide bandwidth from which the weakest signals can be dug out of the in the noise on SSB or CW. If I narrow up the bandwidth with the optional filters I can't copy the signals as well. i.e. with NR enabled together a 2.1 or 500 Hz filter. I hear best with NR together with the 2.7 KHz filter. Interesting! __ 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] NR Revisited (trying again in plain text mode)
I've been pleasantly surprised at how well NR works even with very narrow CW bandwidths. I routinely use a 250 Hz roofing filter followed by 250, 200, or 150 Hz DSP filters for Top Band. The NR set around F1-2 or F1-3 quite often makes a difference for me. It wasn't always this way. Thanks to Elecraft for their continual upgrades via firmware! 73, Chuck NI0C K2-10 s/n 5853 K3 s/n 1061 Joe, KB8AP, wrote: NR works best with wider bandwidths. __ 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] NR Revisited
__ 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] NR revisited
__ 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
