AGC and DNR
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Hi All,
This has probably been discussed, and I obviously missed it. It's probably in the manual somewhere too. Since I have not previously been one to turn my AGC off, I just wasn't aware of it. Now I find that if I turn my AGC off, my DNR will not engage--I get a big "N/A". So, this is normal? You must have the AGC on to use DNR? I apologize in advance for my ignorance on this matter. Dave W7AQK ______________________________________________________________ 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 find that if I turn my AGC > off, my DNR will not engage--I get a big "N/A". So, this is normal? Yes, this has always been the case and remains so. The LMS algorithm can become unstable under certain conditions, one of which is related to maximum signal level. With AGC OFF, NR could become unstable from a really strong signal, so it is inhibited from operating. 73, Lyle KK7P ______________________________________________________________ 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 w7aqk
Dave you are not an ignorant because now that you mentioned it,my K3 behaves the same way, it look like DSP NR works in conjunction with the AGC so when you disengage it then NR will not work at all and the "N/A" (not aplicable) sign shows at the display,anyway I never use the radio without the AGC,for me it works better that way,but maybe this is another issue that Elecraft should fix.
AD4C "For a refined ham it is compulsory to own a k3" --- On Sun, 2/7/10, David Y. <[hidden email]> wrote: From: David Y. <[hidden email]> Subject: [Elecraft] AGC and DNR To: [hidden email] Date: Sunday, February 7, 2010, 2:46 PM Hi All, This has probably been discussed, and I obviously missed it. It's probably in the manual somewhere too. Since I have not previously been one to turn my AGC off, I just wasn't aware of it. Now I find that if I turn my AGC off, my DNR will not engage--I get a big "N/A". So, this is normal? You must have the AGC on to use DNR? I apologize in advance for my ignorance on this matter. Dave W7AQK ______________________________________________________________ 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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Hector,
Lyle emailed an explanation. Apparently DNR gets unstable without AGC, so it is disengaged when AGC is off. I just hadn't noticed it before since, like you, I rarely have AGC off. I was experimenting based on the thread about AGC settings when I noticed it. I'm still looking, but haven't found where it was ever mentioned before. Anyway, it's not a bug in my radio, and Lyle's explanation makes perfect sense now that I think about it. It also give me added appreciation for the things they have to consider when they provide all these neat "goodies" like DNR. Dave W7AQK ----- Original Message ----- From: Hector Padron To: David Y. Cc: [hidden email] Sent: Sunday, February 07, 2010 10:53 AM Subject: AGC and DNR Dave you are not an ignorant because now that you mentioned it,my K3 behaves the same way, it look like DSP NR works in conjunction with the AGC so when you disengage it then NR will not work at all and the "N/A" (not aplicable) sign shows at the display,anyway I never use the radio without the AGC,for me it works better that way,but maybe this is another issue that Elecraft should fix. AD4C "For a refined ham it is compulsory to own a k3" --- On Sun, 2/7/10, David Y. <[hidden email]> wrote: From: David Y. <[hidden email]> Subject: [Elecraft] AGC and DNR To: [hidden email] Date: Sunday, February 7, 2010, 2:46 PM Hi All, This has probably been discussed, and I obviously missed it. It's probably in the manual somewhere too. Since I have not previously been one to turn my AGC off, I just wasn't aware of it. Now I find that if I turn my AGC off, my DNR will not engage--I get a big "N/A". So, this is normal? You must have the AGC on to use DNR? I apologize in advance for my ignorance on this matter. Dave W7AQK ______________________________________________________________ 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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