Don, Thanks a lot. It appears that I'm probably over-thinking this. I'm using my n-gen for a source, and I can identify the skirts. I did as you suggested with L-34, and then adjusted it again using my ears. With Spectrogram, as I adjusted the height of the peak of the spike, the noise on the signal did not ever change. Using my ears I could tell that the noise was being reduced, so you're probably right about picking up the noise between the rig and computer.
L-34 is still maxed out. I wonder if that's a problem, and if there would be more to be gained if there were more adjustment, or should I just declare victory, and move on? 73, Jim KO5V On Tue, 2011-05-03 at 13:32 -0400, Don Wilhelm wrote: > Jim, > > You may be picking up noise on your soundcard input cable. > The only thing you really need to see are the skirts of the passband (so > you can discern the center for CW and the proper placement of the low > frequency skirt close to 300 Hz for the SSB filters) - most everything > else can be ignored for the purpose of aligning the filters. In other > words, you are not analyzing all aspects of the audio signal, just > determining where the passband is. You should have only noise coming > into the K2. If there is a signal present, it will only confuse the > display and make things more difficult. > > For the L34 adjustment, tune to the birdie at 7000 kHz - turn the preamp > on so it is more pronounced. > Use something close to a 700 Hz wide filter. Then first adjust L34 so > the signal spike goes up as far as possible - then tune around that > point (about a turn either direction) while observing the high frequency > end of the audio spectral display to see if you can reduce the noise > level there without reducing the height of the signal spike. If you do > not observe any difference, leave L34 set at the peak for the spike. > > That is all there is to it. > > 73, > Don W3FPR ______________________________________________________________ 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
