The offsets were determined by BIH for UTC as ; 1960, 1961 -150 x10-10 1962-1963 -130 x10-10 1964-1965 -150x10-10 1966-1971 -300x10-10 and in 1972 -0- "the offset in clock rate was chosen to keep the UTC clock in reasonable agreement with ET" (Chapter 1 - NBS Monograph 140)
Ulrich Bangert wrote: > John, > > >> offset that changed annually. IIRC, it was typically something like >> 300x10e-10. >> > > Agreed! And that is what the manual says its good for! > > However, the question remains why different physics packages need > DIFFERENT thumbwheel settings in order to achieve the SAME time scale. > > 73 de Ulrich, DF6JB > > >> -----Ursprüngliche Nachricht----- >> Von: [EMAIL PROTECTED] >> [mailto:[EMAIL PROTECTED] Im Auftrag von John Ackermann N8UR >> Gesendet: Montag, 6. November 2006 17:12 >> An: Discussion of precise time and frequency measurement >> Betreff: Re: [time-nuts] Frequency processing scheme of >> HP5065 vapour rubidium standard >> >> >> Ulrich Bangert wrote: >> >> >>> Agreed! But you are talking about things that happen INSIDE the >>> physics package, don't you? Ok, let us assume that there WERE big >>> differences in the physics packages that need to be >>> >> compensated for. >> >>> In THIS case the tunable synthesizer would indeed make >>> >> sense and even >> >>> more the printed synthesizer settings on the physics >>> >> packages! If this >> >>> were the only information available, i would immediatly >>> >> agree to you! >> >> Ulrich, one thing that hasn't been mentioned is that back in >> the ancient >> days, before leap seconds, UTC was "corrected" by applying a >> frequency >> offset that changed annually. IIRC, it was typically something like >> 300x10e-10. >> >> I think the main use of the adjustable synthesizer was to >> allow you to >> dial in that offset. >> >> I believe that in later versions of the 5065A, the thumbwheel setting >> was removed because after leap seconds came along the need to >> adjust the >> frequency annually went away. My 5065A is a very late one >> and I don't >> think it has those thumbwheels (but I'm not going to take it >> out of the >> rack to find out...). >> >> John >> >> _______________________________________________ >> time-nuts mailing list >> time-nuts@febo.com >> https://www.febo.com/cgi-> bin/mailman/listinfo/time-nuts >> >> > > > _______________________________________________ > time-nuts mailing list > time-nuts@febo.com > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
