[time-nuts] Cross-Correlation Results

John Miles jmiles at pop.net
Sat Aug 4 20:11:53 EDT 2012


> 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






More information about the time-nuts mailing list