[time-nuts] Cross-Correlation Results
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.
> -----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
> > 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
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