John, would an AD measurement also benefit from Cross-Correlation or would we need 2 cross correlated disciplined ocxos for that? Being able to measure AD below that of a single reference would be a dream which could help a lot in avoiding to buy a H2 maser for low AD at all taus.
Best regards Ulrich, DF6JB > -----Ursprungliche Nachricht----- > Von: time-nuts-boun...@febo.com > [mailto:time-nuts-boun...@febo.com] Im Auftrag von John Miles > Gesendet: Sonntag, 5. August 2012 02:12 > An: 'Discussion of precise time and frequency measurement' > Betreff: Re: [time-nuts] Cross-Correlation Results > > > > They have their own cross-correlation system; it's not highly > > automated > but > > claims -190 dBc/Hz capability: > > http://www.wenzel.com/pdffiles1/PNTS%201000/BP-1000-CC.pdf > > Yes, this is equivalent to the "dual HP 3048A" technique. An > inelegant weapon from a less-civilized age.... but still, you > really can't beat a pair of cross-correlated quadrature PLLs > when you absolutely have to achieve the lowest measurement > floor possible. Dead-simple block diagram, no digital noise > or artifacts to worry about.... but a LOT of work to set up, > calibrate and use. > > -- john, KE5FX > www.miles.io > > > > _______________________________________________ > 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.