K3: AGC Adjustment
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Question 1: AGC SLP: The manual reads wrong to me in the discussion pp 53. Wouldn't a slope of zero keep signals from going up in volume more so than a slope of 10? I think of a higher slope meaning faster audio increase as signals get stronger.
Question 2: Under what conditions do you want to change AGC PLS? Ken K5WK ______________________________________________________________ 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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Ken,
SLP High number = flat output for strong and weak sigs. Just give it a try and see for yourself. PLS: always on, it suppresses the AGC reaction to short pulses. Never turned it off here. A lot has been written about this subject. See: www.sherweng.com, presentation about: DSP Radios - Not Perfect 73 Arie PA3A -----Oorspronkelijk bericht----- Van: [hidden email] [mailto:[hidden email]] Namens Kenneth Waites Verzonden: woensdag 9 december 2009 6:37 Aan: [hidden email] Onderwerp: [Elecraft] K3: AGC Adjustment Question 1: AGC SLP: The manual reads wrong to me in the discussion pp 53. Wouldn't a slope of zero keep signals from going up in volume more so than a slope of 10? I think of a higher slope meaning faster audio increase as signals get stronger. Question 2: Under what conditions do you want to change AGC PLS? Ken K5WK ______________________________________________________________ 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 Ken817821
Ken,
Answer 1: The slope number refers to the AGC action, and that is the inverse of the audio response. If charts are helpful to you, Jack Smith has measured and plotted the AGC response for the K3 - see http://www.cliftonlaboratories.com/elecraft_k3_agc_and_s-meter.htm#AGC_SLP_and_AGC_THR 73, Don W3FPR Kenneth Waites wrote: > Question 1: AGC SLP: The manual reads wrong to me in the discussion pp 53. Wouldn't a slope of zero keep signals from going up in volume more so than a slope of 10? I think of a higher slope meaning faster audio increase as signals get stronger. > > ______________________________________________________________ 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 Ken817821
I also wondered about that. The slope of a line (the ratio of vertical
to horizontal displacement) is flatter for lower values. But in the K3 a smaller SLP value means a steeper AGC curve (the AF output changes more for a given change in RF signal). SLP=0 really means least AGC action, not flattest AGC, so the manual description is correct. 73, Drew AF2Z On Tue, 08 Dec 2009 21:37:16 -0800 (PST), Ken K5WK wrote: >Question 1: AGC SLP: The manual reads wrong to me in the discussion pp 53. Wouldn't a slope of zero keep signals from going up in volume more so than a slope of 10? I think of a higher slope meaning faster audio increase as signals get stronger. > >Question 2: Under what conditions do you want to change AGC PLS? > >Ken K5WK >______________________________________________________________ ______________________________________________________________ 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 Don Wilhelm-4
That certainly helps me a lot, I have been struggling with K3 AGC
settings and this helps a lot, I don't remember seeing this posted before. So thanks to Don for posting the link and many, many thanks to Jack for making it clearer. I just need to read that a few more times now. 73 de M0XDF, K3 #174 -- Everything secret degenerates, even the administration of justice; nothing is safe that does not show how it can bear discussion and publicity. -Lord Acton, historian (1834-1902) On 9 Dec 2009, at 13:15, Don Wilhelm wrote: > If charts are helpful to you, Jack > Smith has measured and plotted the AGC response for the K3 - see > http://www.cliftonlaboratories.com/elecraft_k3_agc_and_s-meter.htm#AGC_SLP_and_AGC_THR ______________________________________________________________ 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 have found so many different adjustment parameters for AGC in K3 that I
would apperciate " AGC settings for dummies " type of instructions. :) I previously owned IC-756PRO3 which can be used as reference of well functioning AGC among DSP radios. Very pleasant experience. Olli OH6CT > -----Alkuperäinen viesti----- > Lähettäjä: [hidden email] > [mailto:[hidden email]] Puolesta David > Ferrington, M0XDF > Lähetetty: 9. joulukuuta 2009 17:53 > Vastaanottaja: [hidden email] > Aihe: Re: [Elecraft] K3: AGC Adjustment > > That certainly helps me a lot, I have been struggling with K3 > AGC settings and this helps a lot, I don't remember seeing > this posted before. > > So thanks to Don for posting the link and many, many thanks > to Jack for making it clearer. > I just need to read that a few more times now. > 73 de M0XDF, K3 #174 > -- > Everything secret degenerates, even the administration of > justice; nothing is safe that does not show how it can bear > discussion and publicity. > -Lord Acton, historian (1834-1902) > > On 9 Dec 2009, at 13:15, Don Wilhelm wrote: > > If charts are helpful to you, Jack > > Smith has measured and plotted the AGC response for the K3 - see > > > http://www.cliftonlaboratories.com/elecraft_k3_agc_and_s-meter.htm#AGC > > _SLP_and_AGC_THR > > ______________________________________________________________ > 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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Olli,
I don't think it is so difficult that one needs "AGC for dummies". If you want every signal to have about the same audio level, then set the slope to a higher number, but if you want to hear that a strong signal is louder than a weaker signal by ear (without looking at the S-meter), then go for a smaller numbered slope. That is what Jack Smith's charts indicate - and I have set my slope to 2 since that setting is close to the AGC response on the K2 which I liked. The threshold is set so the AGC will not be active on weak signals - the lower the number, the lower the AGC action will start - set too low, the AGC can become active on band noise and will de-sense the receiver even though there are no signals present. How much band noise is present will depend on atmospheric conditions, local QRN, and your antenna. The beauty of the K3 is that it allows you to change the AGC behavior. If you are not of a mind to study the effect of various setting, I believe you would just leave it set at the defaults until you are ready to investigate the possibilities and learn about them - that is what defaults are all about IMHO. 73, Don W3FPR Olli Tuppurainen wrote: > I have found so many different adjustment parameters for AGC in K3 that I > would apperciate " AGC settings for dummies " type of instructions. :) > > I previously owned IC-756PRO3 which can be used as reference of well > functioning AGC among DSP radios. Very pleasant experience. > > Olli > OH6CT > > 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 M0XDF
Gentlemen,
I truly love this reflector and my sincere thanks to Jack Smith of Clifton Labs for this interesting piece. The ultimate user manual for the K3 might rival Webster's in its weight. 73 Doug EI2CN -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of David Ferrington, M0XDF Sent: 09 December 2009 15:53 To: [hidden email] Subject: Re: [Elecraft] K3: AGC Adjustment That certainly helps me a lot, I have been struggling with K3 AGC settings and this helps a lot, I don't remember seeing this posted before. So thanks to Don for posting the link and many, many thanks to Jack for making it clearer. I just need to read that a few more times now. 73 de M0XDF, K3 #174 -- Everything secret degenerates, even the administration of justice; nothing is safe that does not show how it can bear discussion and publicity. -Lord Acton, historian (1834-1902) On 9 Dec 2009, at 13:15, Don Wilhelm wrote: > If charts are helpful to you, Jack > Smith has measured and plotted the AGC response for the K3 - see > http://www.cliftonlaboratories.com/elecraft_k3_agc_and_s-meter.htm#AGC_SLP_a nd_AGC_THR ______________________________________________________________ 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 Don Wilhelm-4
Don Wilhelm wrote:
> I don't think it is so difficult that one needs "AGC for dummies". If > you want every signal to have about the same audio level, then set the > slope to a higher number, but if you want to hear that a strong signal > is louder than a weaker signal by ear (without looking at the S-meter), > then go for a smaller numbered slope. That is what Jack Smith's charts > indicate - and I have set my slope to 2 since that setting is close to > the AGC response on the K2 which I liked. > > The threshold is set so the AGC will not be active on weak signals - the > lower the number, the lower the AGC action will start - set too low, the > AGC can become active on band noise and will de-sense the receiver even > though there are no signals present. How much band noise is present > will depend on atmospheric conditions, local QRN, and your antenna. Possibly, that WAS "K3 AGC For Dummies." I'm gonna go look at mine, I was bewildered at first. Maybe now, not so much. 73, Fred K6DGW Auburn CA USA ______________________________________________________________ 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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