I think I have the unwrapping and scaling sorted out, so here's the result for 1PPS vs 10MHz for my GPSDO, as measured by a 5334B clocked by the same 10MHz. I don't know how to read these, but 6,3,1,6,3,1 etc. doesn't look normal. I wonder if that merely reflects the consumer grade GPS receiver I'm using (Adafruit Ultimate Breakout), rather than a reflection on the ultimate result? I can link to a plot of the 1PPS vs 10MHz if that's wanted.
Any comments appreciated. ** Sampling period: 1 s ** Phase data scale factor: 1.000e-09 ** Total phase samples: 86399 ** Normal and Overlapping Allan deviation: 1 tau, 6.1669e-09 adev(n=86397), 6.1669e-09 oadev(n=86397) 2 tau, 3.2413e-09 adev(n=43198), 3.2349e-09 oadev(n=86395) 5 tau, 1.2603e-09 adev(n=17278), 1.2470e-09 oadev(n=86389) 10 tau, 6.0606e-10 adev(n=8638), 5.9837e-10 oadev(n=86379) 20 tau, 3.1173e-10 adev(n=4318), 3.0967e-10 oadev(n=86359) 50 tau, 1.2778e-10 adev(n=1726), 1.2618e-10 oadev(n=86299) 100 tau, 6.2970e-11 adev(n=862), 6.3607e-11 oadev(n=86199) 200 tau, 3.6391e-11 adev(n=430), 3.2994e-11 oadev(n=85999) 500 tau, 1.4055e-11 adev(n=171), 1.4008e-11 oadev(n=85399) 1000 tau, 8.4596e-12 adev(n=85), 7.8291e-12 oadev(n=84399) 2000 tau, 4.8688e-12 adev(n=42), 5.0306e-12 oadev(n=82399) 5000 tau, 3.7358e-12 adev(n=16), 4.1679e-12 oadev(n=76399) 10000 tau, 3.7403e-12 adev(n=7), 3.5550e-12 oadev(n=66399) 20000 tau, 1.9271e-12 adev(n=3), 2.6676e-12 oadev(n=46399) _______________________________________________ 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.
