>Date: Thu, 02 Oct 2008 23:58:55 +1300 >From: Bruce Griffiths >Subject: Re: [time-nuts] Testing frequency using NTP
[...] > For precision frequency comparisons NIST divide the frequencies to > be compared down to about 1Hz and time stamp the resultant signal > transitions and the leading edge of the PPS output of a GPS timing > receiver with a resolution of a few picosec. > The resultant timestamps are then processed (along with > measurements taken with a similar system that time stamps the > transitions of a 1Hz signal derived from one or more of their > frequency standards) to derive the frequencies of the various > sources. > Bruce Hello Bruce, This is my first attempt to post so I'm not sure if it will work. I have been researching the forum archive and find it is by far the best resource on time and frequency available anywhere. Also, your posts are extremely helpful to a newcomer. Thanks! I am curious about the NIST GPS timing receiver that has a resolution of a few ps. It doesn't seem possible to get that kind of precision with conventional GPS methods that produce a 1pps signal. Can you describe more how this is done, and do you have any web links that give more information? Thanks, Mike Monett _______________________________________________ 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.