In short, yes. If you want true traceability to NIST, you need to take into account UTC(GPS) versus UTC(NIST).
I don't think you would do this by adjusting the cable delay, because that offset will change over time. Instead, you post-process by getting the offset for the time during which you made the measurement, and adding it to your solution. John ---- Jason Rabel wrote: > Since we are on the subject... I came across this page the other day and am > curious about what other's thoughts are about it. > > http://tf.nist.gov/service/gpstrace.htm > > If I understand correctly looking at the graphs, they are saying the time > from GPS is currently off about 24-30ns from the NIST frequency standard. So > does that mean that a person wanting every last ns should adjust their delay > according to the data on that page (and of course things like cable delay > and other circuitry)? > > Jason > >> But we're time-nuts... we DO worry about those things. :-) >> >> While we were at it with the network analyzer, we did FDR (frequency >> domain reflectometry) to measure the cable delay to the antenna, and I >> spent yesterday making up six matched cables to go from the splitter to >> the receivers -- they all test within about 1 nanosecond of each other. >> >> Obsessive compulsive? Me? >> >> John > > > _______________________________________________ > time-nuts mailing list > [email protected] > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
