--- John Ackermann N8UR <[EMAIL PROTECTED]> wrote: > Hi Normand -- > > Your method is similar to mine, except that I use a > much closer beat > note (usually less than 100 Hz) and use spectrum > analyzer software and a > sound card to measure the beat note (in the form of > the delta between > two traces on the waterfall display).
Well, you use long term DIGITAL techniques to track probably to the µHz.. i simply use an ANALOG technique to get down to a +/- 10 mHz resolution, and using a higher beat frequency is simply more comfortable to the eye (X-Y scope display). Also, my generator has a 100 Hz resolution, so i can only use 100 Hz multiple beat notes. > > I think one of the reasons this method works so well > is that the FFT > effectively averages the signal over some time, and > I use a tool in the > software to derive an average across all the FFT > results. That smooths > out the instantaneous variations that make real-time > measurement such a > challenge. > > John > ---- Maybe some day!! 73 de Normand VE2UM ____________________________________________________________________________________ Cheap talk? Check out Yahoo! Messenger's low PC-to-Phone call rates. http://voice.yahoo.com _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts