New inexpensive frequency calibration service from NIST

Author

Allan, D.W. ; Davis, D.D. ; Levine, J. ; Weiss, M.A. ; Hironaka, N. ; Okayama, D.

Author_Institution

Nat. Inst. of Stand. & Technol., Boulder, CO, USA

fYear

1990

fDate

23-25 May 1990

Firstpage

107

Lastpage

116

Abstract

An extremely cost-effective, modest-accuracy method of remotely obtaining time and frequency via a telephone model is demonstrated. This method uses the operation of the National Institute of Standards and Technology´s (NIST) Automated Computer Time System (ACTS), which was begun in 1988. Time and frequency dissemination by this service depends on the reciprocity of the telephone system. The round-trip delay is measured by the NIST equipment. The advance of an on-time marker is adjusted so as to arrive at the user´s site on time. A frequency calibration method taking advantage of this service, and preliminary tests are discussed. A computer is not required to access this service. All that is required is a telephone modem, a simple peripheral circuit to generator an on time marker and standard time and frequency measurement and data processing equipment

Keywords

calibration; frequency measurement; modems; telephony; time measurement; NIST; frequency calibration; frequency measurement; on time marker; on-time marker; round-trip delay; telephone model; time measurement; Calibration; Circuits; Frequency conversion; Frequency measurement; Measurement standards; Modems; NIST; Stability; Telephony; Time measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Frequency Control, 1990., Proceedings of the 44th Annual Symposium on

Conference_Location

Baltimore, MD

Type

conf

DOI

10.1109/FREQ.1990.177488

Filename

177488