> The time constant should have been 22ms and the phase shift 1.16us with > a tempco of 580ps/C. > Since both channels have the same nominal low frequency cutoff the > differential phase shift tempco will be somewhat smaller.
Thanks for the calculations. So it's probably safe to say the differential phase shift stability is many orders of magnitude less than NTP jitter. Good. Anyway, I think it would make a fun project to see how well a typical PC sound card actually does as a 1PPS or LF phase comparator and frequency counter. I wouldn't expect better results than a $50 surplus eBay time interval counter, but it would be interesting to see just how bad or even how good it might be. There are, after all, many timing applications where nanosecond and picosecond resolution isn't required. /tvb _______________________________________________ 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.
