Hi If you digitize the beat note it’s fairly simple:
The beat note is not really a sine wave. It’s periodic, but not a pure sine. The reason is fairly simple. The frequency changes as the beat note changes the EFC. You have a lower frequency as it gets closer to the “zero frequency”. The net result is a signal that is a bit flat on the side that is towards the zero. It’s a bit sharper away from the zero. Fit it with a sine wave and you will get a residual. From that you can work out which side is which. Bob > On Sep 26, 2015, at 5:47 PM, Hal Murray <hmur...@megapathdsl.net> wrote: > > > mag...@rubidium.dyndns.org said: >> Another method would be to measure the phase-detector beat-note frequency >> (most have mixer-like behavior), which you should be able to measure with >> quite good precision, then set the EFC accordingly and then close the loop. > > How do you get the sign out of a beat note? > > > -- > These are my opinions. I hate spam. > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
