From what I though the original post was about the trouble copying signals in a pile up, it appears to me that thread has become at least 3 different topics. Seems there are people talking desense, AGC settings, and the pile up problem. To make mine clear, I do not have any desense problems with the K3, I can work within hundreds of HZ from very strong stations and have never had it blank the receiver when using narrow filters. AGC, I dont think it is the problem as I have it turned off most of the time and use the RF gain. The third problem is what I have had and apparently others, when there are many stations calling in a pile up that are a sig strength of say s4 to s5, the audio turns to mush and they all sound the same, no difference in strength, like they are all clipped somehow to the same level and distorted. Not a pure audio tone any longer, does not happen with just a couple stations in the pile up, only when maybe over 5 or 6 at a time are calling. Turns to mush as some one said. Have not tried turning the radio on and off when that happens, but will next time to see it that resets something. In an case dont lump all these comments that have come under the desense heading as one problem, it appears to be at least 3.. Perhaps the subject is incorrectly titled. Merv KH7C > It seems that this thread is VERY confused about how AGC works to > control the RF gain. I also suspect that some are using the radio > with too much RF gain. The settings that W4ZV posted are pretty > much what I use, except that I regularly also run the RF gains > (both main and sub) at about 2 o'clock when I hear signals getting > buried in the background noise. > > I also think many do not understand the definition of desense. > Desense occurs when a gain stage is driven into clip so badly that > the bias point shifts and reduces the gain (worst case, to > cutoff). So far, I've never heard my K3s desense. I have heard a > strong station pump the AGC when I'm copying a weak station. I've > also heard massive phase noise and clicks from a dirty transmitter > (most recently, a JA who was only about 5dB over S9 when I was > trying to run JAs 1 kHz away from him on 40M). And there's a JA > who made it into my logbook on 80M with a power exchange of 1 > watt! He wouldn't have with any other radio. > > One expansion of W4ZV's comments regarding perception of pitch. > Human sight and hearing are logarithmic. Human hearing works on > the basis of what acousticians call "critical bands," which are > logarithmic, and which are tied to the physical construction of > the human hearing system itself. The filter between our ears is > better able to separate a 50 Hz pitch difference at 300 Hz than at > 900 Hz! That's one reason why some CW operators like to work at > lower pitches when the going gets tough. > > 73, > > Jim Brown K9YC > (Member Acoustical Society of America) > > > ______________________________________________________________ > 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 > >
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