Thank you for your explanation. Your Lady Heather plot prompts a couple of questions though:
1) Presumably you created the 40ns phase step by changing the output timing offset? 2) Presumably, again, the plotted data is from the self reported data from the Thunderbolt? I have been running a series of tests myself this year, but on looking at the results, it became clear - and I should have twigged this earlier - that all the Thunderbolt can do is report the differences between itself and the noisy GPS signal. Whereas what I really wanted was a comparison to a stable external standard. Sadly I don't have TVB's Maser or 5071s, but I suspect that such a comparison would give a rather different plot. Tom has talked about these factors on his page at http://www.LeapSecond.com/pages/tbolt-tc/ just showing MDEV plots. Tom: would you have the time to replicate Warren's experiment, but show the phase and frequency plots with respect to your Maser or 5071? As an aside, at the beginning of the year when the TAPR offer was on, it was suggested on here that the time constant be set to that where the ADEV plot reaches a minimum whilst on holdover. A couple of days after turning on, mine was about 700 seconds. Now, nine months continuous operation later, and with the Thunderbolt in the recommended cardboard box to protect from drafts, the plot now reaches a minimum at about 2500 seconds! Peter _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
