It is not "on the same" frequency problem, however signals are quite close together but it´s difficult to say exactly how close. The thing is that the "signal package" has to be weak enough, lets say in the S4-S6 region, if you make the same signal package stronger the problem will go away. I would say you need at least 3 signals or maybe 4 to 5 to get the problem. I do understand that it would be very difficult to reproduce, after all the noise floor might even be a key factor, at least I do think so. Well at least it´s nice to know that Elecraft is working on it.
Oh by the way, I just computerized all my paper logs and do find QSO´s with WA6HHQ back in 1973 1976 and 1998, jeez 1973 a long time ago. 73 Jim SM2EKM -------------------- On 2011-12-04 21:31, Eric Swartz WA6HHQ - Elecraft wrote: > We actually have a 'pile-up' generator we designed that sends multiple > cw signals. So far it has not reproduced the issue here. > > What is the signal spacing you are hearing this with? All -exactly- on > the same freq? Or spread out? > > 73, Eric > > _..._ > > > On 12/4/2011 12:20 PM, Jan Erik Holm wrote: >> This is exactly what I have noticed too. Not even 10 signals >> are needed either. >> /SM2EKM >> ------------------------------------------- >> On 2011-12-04 20:53, Merv Schweigert wrote: >>>> Also, in the heat of the contest or DX pile up most reporters do not >>>> recall how they had their AGC parameters set (threshold, slope, AGC >>>> decay soft/hard, fast or slow, and fast/slow settings etc. If you can >>>> let us know your complete set up for AGC parameters, if you are using >>>> headphones or speakers, the signal strengths, CW or SSB, RX b/w, what >>>> different settings you tried etc., that will be extremely helpful. >>>> >>> AGC DCY = NOR >>> AGG HLD = 20 >>> AGC PLS = NOR >>> AGC SLP = 000 >>> AGC THR = 008 >>> AGC F = 200 >>> AGC S = 020 >>> >>> Headphones and speaker, no difference >>> signals S3-S4 range >>> CW >>> all bandwidths, use mostly 400hz and narrower. >>> Tried AGC DCY = SOFT (have PF1 programmed to switch that in and out >>> fast) >>> ALL settings of SLP and THR >>> Turning off the AGC improves the "mush". >>> Loud signals are no problem at all, the K3 handles loud signals >>> better than >>> any radio.. its when multiple signals of about S-4 are on this occurs, >>> more >>> than two or three, a pile up of same strength signals. >>> I can understand it may difficult to reproduce unless you have a way to >>> have >>> 10 signals of the same strength, close to the same freq, and keying, >>> just a >>> carrier will not reproduce the effect, has to be keyed signals you are >>> trying >>> to copy. They turn into a single level buzz of sorts. >>> >>> One note - If signals are below S9+20 and turning AGC off does not help, >>>> its probably not a DSP AGC or H/W AGC issue. >>>> >>>> Also, make sure to use the AGC Limiter menu setting to hard limit audio >>>> levels if you use AGC OFF. >>>> >>> Never use NR or NB and have the AGC limiter set for no AGC times. >>> >>> In my rough gestimation it seems that signals in the S3-S4 range need to >>> not trigger >>> the AGC as they do, if one could set the THR to higher level? perhaps >>> it would stop the >>> problem. >>> Is it possible to increase the range of SLP and THR to move the point >>> where S-3 or S-4 >>> signals trigger the AGC? >>> Thanks much Eric. 73 Merv K9FD/KH6 >>> > ______________________________________________________________ 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
