Re: [time-nuts] NIST's WWVB phase modulation format paper from PTTI 2011
If I'm right, that's another broken egg in the frequency reference basket. I read the paper, but I could use an expert ruling from the list: What does this actually mean for my Spectracom 8170 and Spectracom 8164, i.e. the twins? The latter I frankly don't use much (I'm early in the time-nuts disease progression), but the 8170 I want to continue to rely on, at least to set itself. A little phase noise I can tolerate. But the recent transmission-format experiments coincided (to a first approximation) with the recent coronal mass ejection that knocked the 8170 on its ass for most of a week, so my observations are not conclusive. The circuit (still a-building) to set my SWCC clock will take the 1PPS edge, but the speed of the solenoid, not to mention the time constant of the current-loop, I'm sure vastly outweighs this new source of error. Right? Will the strip-chart recorder on the 8164 provide a new source of amusement, as it tries to plot the 180-degree phase changes every second? ___ 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] NIST's WWVB phase modulation format paper from PTTI 2011
Here is a copy of the paper NIST co-authored describing the new WWVB phase modulation format: http://jks.com/wwvb.pdf (2MB PDF) John Lowe from NIST said I could redistribute it to the list. It will be available on the NIST website sometime in April once the official PTTI 2011 proceedings are published. When that happens I'll remove my link above and you can find the paper here: http://tf.boulder.nist.gov/general/publications.htm (search for Bin Number 2591) Also of interest, a company contracted to help with the development will have silicon (and patents) at some point: http://www.xtendwave.com/xtendwave-awarded-grant-for-atomic-clock-enhancements.html http://www.xtendwave.com/atomictimekeeping.html ___ 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.
Re: [time-nuts] NIST's WWVB phase modulation format paper from PTTI 2011
Has anybody looked at the impact of the periodic phase reversals of BPSK on the loop of phase-tracking receivers, like the Fluke or the HP 117A? NIST does claim backward compatability for time. But what about time interval? I know you can extract the carries from BPSK with a Costas Loop (which essentially squares the signal and uses the second harmonic) but the existing, installed hardware does not do this. If I'm right, that's another broken egg in the frequency reference basket. Best, -John Here is a copy of the paper NIST co-authored describing the new WWVB phase modulation format: http://jks.com/wwvb.pdf (2MB PDF) John Lowe from NIST said I could redistribute it to the list. It will be available on the NIST website sometime in April once the official PTTI 2011 proceedings are published. When that happens I'll remove my link above and you can find the paper here: http://tf.boulder.nist.gov/general/publications.htm (search for Bin Number 2591) Also of interest, a company contracted to help with the development will have silicon (and patents) at some point: http://www.xtendwave.com/xtendwave-awarded-grant-for-atomic-clock-enhancements.html http://www.xtendwave.com/atomictimekeeping.html ___ 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.
