Lyle, can you describe what the Threshold value might be at a particular numerical setting? For example, is AGC action initiated at about 5 uv with a setting of "3" and a setting of "2" might be at 1 uv.
I'm still trying to understand how this works. It seems the Orion threshold setting worked in the opposite way--that is, lowering the threshold raised the signal level. Or maybe my memory is faulty. thanks, Gary W7TEA Lyle Johnson wrote: > > DSP firmware 1.87 corrects two AGC problems occasionally resulting in > complaints of unexpectedly loud signals in an operator's headphones. > > The first lowers the AGC threshold. It was inadvertently raised > sometime after release 1.47. It is now back to its original range. > > The second corrects a problem in the AGC slope. As signals grew > stronger, the AGC was not properly restricting their range, particularly > for signals from about S9 to the activation of hardware AGC (about S9+5 > or 10 in the earliest K3s; about S9+20 in later K3s and those with the > HAGC mod). > > The new code sets the slope of the AGC as "linear in dB." This means > that if you have it set for, say, 1 dB of output change for 10 dB of > signal change, then an input signal change of 40 dB will result in about > a 4 dB change in the audio level. > > The slope now ranges from essentially flat output (CONFIG:AGC SLP 15) to > about 3.75 dB audio rise per 10 dB signal rise (CONFIG:AGC SLP 0). Each > step is about 0.25 dB audio change per 10 dB of input signal change. > > You probably won't need to alter any AGC settings in your K3, but you > may want to experiment with different values of CONFIG:AGC THR and > CONFIG:AGC SLP. Remember, there is no "correct" setting; the K3 is > designed to be tailored to your preferences. > > Enjoy! > > 73, > > Lyle KK7P > > -- View this message in context: http://n2.nabble.com/K3-Beta-Firmware-Release----MCU-Revision-2.19-tp577543p579742.html Sent from the Elecraft mailing list archive at Nabble.com. _______________________________________________ Elecraft mailing list Post to: [email protected] 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
