[time-nuts] Cross-Correlation Results

Ulrich Bangert df6jb at ulrich-bangert.de
Sun Aug 5 08:50:03 UTC 2012


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-bounces at febo.com 
> [mailto:time-nuts-bounces at 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 at febo.com
> To unsubscribe, go to 
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.

More information about the Time-nuts_lists.febo.com mailing list