[time-nuts] Cross-Correlation Results

John Miles jmiles at pop.net
Sun Aug 5 00:11:53 UTC 2012

> 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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