AGC
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OK, now that I'm slowly getting my station rebuild to the point where
I'm operating my K3 on a regular basis, I'm noticing that the AGC seems to be kind of sub-optimal. There are large differences in audio volume when receiving different strength signals. I have not been directly comparing the K3 to another receiver, but it keep surprising me (in a bad way). On a couple of occasions, I had to rip off my headphones, because it was faster than reaching for the volume control. I seem to remember this being somewhat of an issue with earlier firmware versions, but I'm running 2.13 at this time. Is anyone else having this issue? 73, Steve NN4X _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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Have you tried adjusting the CONFIG:AGC SLP parameter? I've set mine
to the maximum value, 15, for flattest AGC slope. Bob NW8L On Mon, Jul 7, 2008 at 8:13 AM, S Sacco <[hidden email]> wrote: > OK, now that I'm slowly getting my station rebuild to the point where > I'm operating my K3 on a regular basis, I'm noticing that the AGC > seems to be kind of sub-optimal. There are large differences in audio > volume when receiving different strength signals. I have not been > directly comparing the K3 to another receiver, but it keep surprising > me (in a bad way). On a couple of occasions, I had to rip off my > headphones, because it was faster than reaching for the volume > control. > > I seem to remember this being somewhat of an issue with earlier > firmware versions, but I'm running 2.13 at this time. > > Is anyone else having this issue? > > 73, > Steve NN4X > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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I have the CONFIG: AGC SLP parameter set to 15 also and I think it is not
aggressive enough - that is, the volume difference is too large between weak and strong signals. 73, Bud N7CW -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Bob Cunnings Sent: Monday, July 07, 2008 7:18 AM To: S Sacco Cc: Elecraft Reflector Subject: Re: [Elecraft] [K3] AGC Have you tried adjusting the CONFIG:AGC SLP parameter? I've set mine to the maximum value, 15, for flattest AGC slope. Bob NW8L On Mon, Jul 7, 2008 at 8:13 AM, S Sacco <[hidden email]> wrote: > OK, now that I'm slowly getting my station rebuild to the point where > I'm operating my K3 on a regular basis, I'm noticing that the AGC > seems to be kind of sub-optimal. There are large differences in audio > volume when receiving different strength signals. I have not been > directly comparing the K3 to another receiver, but it keep surprising > me (in a bad way). On a couple of occasions, I had to rip off my > headphones, because it was faster than reaching for the volume > control. > > I seem to remember this being somewhat of an issue with earlier > firmware versions, but I'm running 2.13 at this time. > > Is anyone else having this issue? > > 73, > Steve NN4X > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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I agree, I also have mine set at 15 and there does seem to be a large
difference in the audio level of weak and loud stations... Jim K4JAF ----- Original Message ----- From: "Bud Semon N7CW" <[hidden email]> To: <[hidden email]> Sent: Monday, July 07, 2008 9:26 AM Subject: RE: [Elecraft] [K3] AGC >I have the CONFIG: AGC SLP parameter set to 15 also and I think it is not > aggressive enough - that is, the volume difference is too large between > weak > and strong signals. > > 73, Bud N7CW > > -----Original Message----- > From: [hidden email] > [mailto:[hidden email]] On Behalf Of Bob Cunnings > Sent: Monday, July 07, 2008 7:18 AM > To: S Sacco > Cc: Elecraft Reflector > Subject: Re: [Elecraft] [K3] AGC > > Have you tried adjusting the CONFIG:AGC SLP parameter? I've set mine > to the maximum value, 15, for flattest AGC slope. > > Bob NW8L > > On Mon, Jul 7, 2008 at 8:13 AM, S Sacco <[hidden email]> wrote: >> OK, now that I'm slowly getting my station rebuild to the point where >> I'm operating my K3 on a regular basis, I'm noticing that the AGC >> seems to be kind of sub-optimal. There are large differences in audio >> volume when receiving different strength signals. I have not been >> directly comparing the K3 to another receiver, but it keep surprising >> me (in a bad way). On a couple of occasions, I had to rip off my >> headphones, because it was faster than reaching for the volume >> control. >> >> I seem to remember this being somewhat of an issue with earlier >> firmware versions, but I'm running 2.13 at this time. >> >> Is anyone else having this issue? >> >> 73, >> Steve NN4X >> _______________________________________________ >> Elecraft mailing list >> Post to: [hidden email] >> You must be a subscriber to post to the list. >> Subscriber Info (Addr. Change, sub, unsub etc.): >> http://mailman.qth.net/mailman/listinfo/elecraft >> >> Help: http://mailman.qth.net/subscribers.htm >> Elecraft web page: http://www.elecraft.com >> > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by S Sacco
> ... There are large differences in audio
> volume when receiving different strength signals. There are two AGC parameters that should help. 1) AGC THR This sets the signal strength which must occur before AGC is activated. It is defaulted to the several microvolts range. If you are listening on a quiet band with a gain turned up, you might have 20 or 30 dB of signal range before AGC starts. Set AGC THR to a lower value. Based on your comments, I suggest a value of 1 or perhaps 2. CONFIG:AGC THR 001 (default is 5) 2) AGC SLP Once AGC is activated, this determines how much louder strong signals may sound than signals just at the AGC threshold. 15 will really flatten the response. CONFIG:AGC SLP 015 (default is 10) I suspect if you adjust both of these parameters - and AGC is ON! - you will be happier with the K3 in your particular operating environment. 73, Lyle KK7P _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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> CONFIG:AGC THR 001
> > (default is 5) Sorry, I just checked and I see 002 is the lowest allowed value in the present firmware release. 73, Lyle KK7P _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Jim Cox
On Mon, 7 Jul 2008 09:55:58 -0500, "Jim Cox" <[hidden email]> wrote:
>I agree, I also have mine set at 15 and there does seem to be a large >difference in the audio level of weak and loud stations... Jim K4JAF > > >----- Original Message ----- >From: "Bud Semon N7CW" <[hidden email]> >To: <[hidden email]> >Sent: Monday, July 07, 2008 9:26 AM >Subject: RE: [Elecraft] [K3] AGC > > >>I have the CONFIG: AGC SLP parameter set to 15 also and I think it is not >> aggressive enough - that is, the volume difference is too large between >> weak >> and strong signals. >> >> 73, Bud N7CW >> At the setting of 15 it sounds about the same as other rigs I've owned over the years. I prefer a setting of 12 because I like for the bigger signals to sound louder. Tom, N5GE - SWOT 3537 - Grid EM12jq "Those who would give up Essential Liberty to purchase a little Temporary Safety deserve neither Liberty nor Safety" An excerpt from a letter written in 1755 from the Assembly to the Governor of Pennsylvania. Support the entire Constitution, not just the parts you like. http://www.n5ge.com http://www.eQSL.cc/Member.cfm?N5GE _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Amateur Radio Operator N5GE
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In reply to this post by Jim Cox
>> I have the CONFIG: AGC SLP parameter set to 15 also and I think it is not
>> aggressive enough - that is, the volume difference is too large >> between weak and strong signals. I just measured it. From a signal at the AGC threshold (-104 dBm if AGC THR is set to 005) to a signal 100 dB stronger, the audio output varies less than 0.1 dB. It's hard to get much flatter! I think the sumptom you are experiencing is not related to flatness, but to threshold. If you set AGC THR from 005 (default) to 002 (the smallest allowed value at present) the threshold will drop from about -104 dBm (1.4 uV or so) to about -112 dBm (0.5 uV or so). This will take about 8 dBV (or 16 dB in terms of power your ears hear) off the maximum level you'll hear at any particular AF GAIN setting as compared to the noise floor of the radio. 73, Lyle KK7P _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by KK7P
Thanks, Lyle -
I've made those changes, and will see how they work. Appreciate the help!! 73, Steve NN4X On Mon, Jul 7, 2008 at 11:08 AM, Lyle Johnson <[hidden email]> wrote: >> ... There are large differences in audio >> volume when receiving different strength signals. > > There are two AGC parameters that should help. _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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Steve, please report back with the results of your change.
I have my AGC slope set to 3 or 4 IIRC. Anything more than that and the rig just sounds flat with noise & signals all being the same level, just like all the rigs that I've owned before. - Keith N1AS - - K3 711 - -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of S Sacco Thanks, Lyle - I've made those changes, and will see how they work. Appreciate the help!! 73, Steve NN4X _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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