On Sun, October 14, 2018 9:07 pm, Chris Burford wrote: > I've collected several data sets over the last few days from my RFS > and I'm puzzled by what I'm seeing.
Frequency stability measurements must always compare one device against another. I do not recall that you mentioned what is providing the reference frequency for your measurement. Is it possible that your reference signal has some odd behavior that falls in that time range? It reminds me of the behavior of a PLL crossing over between the noise behavior of the local oscillator and the noise of the reference signal. Are you by chance using a GPS disciplined oscillator for reference, which would have effectively a PLL which crosses over noise behavior from the local oscillator at short time scales to the GPS receiver behavior at long time scales? For that matter a rubidium standard would have an OCXO providing the output frequency, but it would be locked to the rubidium transitions at long time scales, so even with a perfect reference signal you may still see PLL crossover behavior in the output of a rubidium standard. -- Chris Caudle _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
