In your opinion, how the Wenzel company got the data for the ULN specifications?
On Sat, Aug 4, 2012 at 11:02 PM, Bruce Griffiths <bruce.griffi...@xtra.co.nz > wrote: > John Ackermann N8UR wrote: > >> Magnus inspired me to try my own cross-correlation experiment with the >> TimePod today. I used two fairly normal OCXO frequency standards as the >> reference, and a Wenzel 5 MHz ULN as the device under test. >> >> By doing single-reference measurements of each OCXO versus the ULN, I was >> able to plot their noise. Since the ULN has performance near the noise >> floor of the TimePod, I could then test how well the correlation works to >> allow measurements below the noise of either reference. >> >> Conclusion: it works *really* well. Plots and a little write-up are at: >> http://www.febo.com/pages/cross-correlation/index.html >> >> John >> >> _______________________________________________ >> 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. >> >> Even a pair of Trimble 34310T ocxos appear to work well as the dual > reference oscillators. > > If one could use a pair of ocxos to drive the other pair of ADCs it should > be possible to evaluate the contribution of the Timepod itself to the noise > floor. > > Using an interferometric technique with a Timepod allows a PN noise floor > of -200dBc/Hz or less to be achieved (with a test source noise floor of > around -175dBc/Hz or worse) when measuring the additive PN of components > such as amplifiers. > > Bruce > > > _______________________________________________ > 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.