It isn't an individual rig problem, and if everyone who has noticed the problem sent their rig back Elecraft wouldn't get anything else done. I think recreating the conditions is the relevant issue ... not variation from rig to rig.
It isn't difficult to figure out how close the signals need to be. They need to be close enough in frequency that their sum and difference frequencies when mixed overlap onto the great majority of the originating signals. I can fairly easily discern two keyed signals 10 Hz apart, but put five of them within 30 Hz and the K3 turns them all into pudding. The mechanics of the problem seem pretty simple to me. The closer the signals are the fewer are needed to cause an overlap problem. The further apart they are, the more of them are required for the mixed products to land on originating signals. I'm sure someone could describe it mathematically, and probably already has. Here's a point that I think a lot of people are missing, though ... the signals need to be pretty weak. As someone else recently mentioned, the problem doesn't occur on strong signals. If you have a high ambient noise level you may never even have the opportunity to notice the problem. Dave AB7E On 12/4/2011 1:34 PM, Brian Alsop wrote: > Interesting. > > Just a thought: > To rule out or identify hardware problems, I wonder if someone with > "mush" problem would be willing to loan Elecraft the offending rig? > > I wonder just how "exactly" on frequency guys calling from spots really > are? Spots are quantized in 0.1 KHz steps. Many radios are off by 100 > Hz. So it is easy to imagine the responders calling within a 150-200Hz > window. That's still a mess. > > 73 de Brian/K3KO > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
