Performance Data of U.S. Naval Observatory VLG-11 Hydrogen Masers Since September 1983

R.F.C. Vessot, E.M. Mattison, E.A. Imbier and Z.C. Zhai, W.J. Klepczynski, P.G. Wheeler, A.J. Kubik, G.M.K. Winkler

Abstract:	In 1983, two VLG-11 masers were delivered to the U.S. Naval Observatory by the Smithsonian Astrophysical Observatory. Last year the short-term stability of these masers was reported and the effect of this short-term stability on timekeeping performance was discussed by G.M.R. Winkler [1]. Since the date of installation, 13 September 1983, data on the masers' long-term performance have been accumulated. Figure 1 from reference [1] shows the Allan variance of the relative frequency between the masers. This variance reaches a minimum of about 4 parts in 1016 at averaging times of 5x10^3 seconds and rises at longer averaging times due, at least partly, to systematic frequency drift. In this paper we discuss the systematic frequency drifts.
Published in:	Proceedings of the 16th Annual Precise Time and Time Interval Systems and Applications Meeting November 27 - 29, 1984 NASA Goddard Space Flight Center Greenbelt, Maryland
Pages:	375 - 384
Cite this article:	Vessot, R.F.C., Mattison, E.M., Imbier, E.A., Zhai, Z.C., Klepczynski, W.J., Wheeler, P.G., Kubik, A.J., Winkler, G.M.K., "Performance Data of U.S. Naval Observatory VLG-11 Hydrogen Masers Since September 1983," Proceedings of the 16th Annual Precise Time and Time Interval Systems and Applications Meeting, Greenbelt, Maryland, November 1984, pp. 375-384.
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