>> Remember, the AGC is only supposed to bring things to the level of >> your AF output setting.
No. AGC should never "bring up" the level. AGC *REDUCES* the level of signals above the AGC threshold. One normally sets the audio level for signals *at the AGC threshold* or below and AGC keeps stronger signals from exceeding that level (by the amount of the "slope" if one is not using a "hard" threshold). The difference with an *AUDIO PEAK FILTER* is that the APF is in the AUDIO circuit *AFTER* the detector and *OUTSIDE* the AGC loop. Since the PEAK gain of the K3 APF is roughly 10 dB - see the response here: http://n1eu.com/K3/K3_apf.htm - this can cause an issue with strong signal but is a big advantage with signals at or near the noise level (and below the AGC threshold). Of course, the gain is exactly why APF can be turned on and off ... you don't want it on with strong signals - only with those at the noise signals where it makes a difference! 73, ... Joe, W4TV On 11/6/2010 8:20 PM, The Smiths wrote: > > I think that your understanding of the AGC is probably pretty good. I also > think that most people don't know how to set their AGC properly. Yes, there > should have been SOME control over the loudness of the other signal, but > because the Peak filter brings everything up as it does it can also take an > S9 signal and make it sound like an S40 over signal too, even when the AGC is > compressing things.. > > Remember, the AGC is only supposed to bring things to the level of your AF > output setting. Therefore if you have your AF all the way up, well, that's > as loud as the AGC will put it under Sloping conditions.. It doesn't mean > that EVERY weak signal will also be within your AGC Threshold. What "sounds > loud" because of the APF is on doesn't mean that it's opening your threshold > control in the AGC. There in lies your problem I think.. What you thought > was under AGC control, really wasn't!. What you were actually hearing is > proper Dynamic range you should have. So the volume control still comes into > play. > > I'll send you a copy of my AGC tutorial offline. I hope this helps you out > some. > > >> Date: Sat, 6 Nov 2010 19:46:11 -0400 >> From: n...@nf4l.com >> To: elecraft@mailman.qth.net >> Subject: Re: [Elecraft] APF and audio limiting >> >> Thanks Tom. >> >> Well, I kinda thought it shouldn't blast my ears that hard. Audio *WASN'T* >> up too >> loud for the signal I was after. Maybe I don't understand what AGC does. >> That's why I >> asked the questions I did. >> >> On 11/6/2010 6:21 PM, Amateur Radio Operator N5GE wrote: >>> On Sat, 06 Nov 2010 18:04:18 -0400, Mike<n...@nf4l.com> wrote: >>> >>> Sounds normal to me. >>> >>> Audio up too loud and APF on, then a strong signal transmits on the >>> frequency >>> you are listening to.... >>> >>> What do you think it SHOULD have done? You didn't say. >>> >>> Tom >>> Radio Amateur N5GE >>> >>>> On 11/4/2010 9:48 PM, Mike wrote: >>>>> I'm playing with the new APF, and trying to get a REALLY weak QSO to pop. >>>>> I have the >>>>> volume cranked up pretty good, and a REALLY strong station throws in >>>>> their call. I >>>>> thought my speakers had blown. Glad I wasn't wearing cans. >>>>> >>>>> My CONFIG:AF is 18, AGC = F. >>>>> >>>>> Was I doing something wrong? Anybody else experience this? Do we need/can >>>>> we have >>>>> better audio limiting? >>>>> >>>>> 73, Mike NF4L >>> >> >> >> ______________________________________________________________ >> 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
