New inexpensive frequency calibration service from NIST
- 4 December 2002
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- p. 107-116
- https://doi.org/10.1109/freq.1990.177488
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
This publication has 2 references indexed in Scilit:
- The NIST automated computer-time serviceJournal of Research of the National Institute of Standards and Technology, 1989
- Time and Frequency (Time-Domain) Characterization, Estimation, and Prediction of Precision Clocks and OscillatorsIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 1987