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- W2186602760 abstract "Because of the increasing interest in time and frequency dissemination via television signals, the National Bureau of Standards (NBS) has sponsored an experiment using an active time and frequency code transmitted on a U.S. television network encompassing nationwide coverage. Some history of the project is given. The format of the tele- vision code and the equipment necessary to generate and decode the transmitted information are discussed. Statistical results of system stability from New York City, New York, to Boulder, Colorado, and to Los Angeles, California, are presented, and comparisons are made with earlier observations using the passive line-10 television time synchroniza- tion technique and the 3.58-MHz color-burst frequency reference used for colorcasts. Analysis of the frequency-transfer capability is presented, and the ability of a phase-locked oscillator to lock to the code's fre- quency reference is discussed. With the decoder's oscillator in a locked condition, plots of phase with respect to time, time domain stability using the Allan variance, and spectral noise reveal that the system per- mits calibrationof aremote standard to onepart in within one-half hour. Long-term stability (several days) is typically a few parts in 10l2. Using an active time code, short-term stability is governed to a Experiments completed previously between the National Bureau of Standards and Newark Air Force Station, Ohio, using the ABC, CBS, and NBC' television networks, indicate that the distribution system is very stable with respect to both short- and long-term measures (I). The method of measure- ment utilized line 10 (tenth line of the odd field of video) in the 525-line system as a time transfer. This has come to be called the passive line-10 synchronization method and is widely used in areas where a common television network or station may be monitored at two receiver sites simultaneously. With this method it is necessary that the two sites be time syn- chronized previous to taking measurements to within 33 ms, the ambiguity of the technique. (The period of the recurrent line 10 is approximately 33 ms.) The time of arrival of line 10 at each site must then be coordinated either through joint communication or bv relating measurements to published noticeable degree by the television industry's standard video format. data from the ~~~i~~d B~~~~~ if Standards (NBS) or us ~~~al Finally, a schematic diagram, with discussion, outlines how time-of-day Observatory (USNO). At some TV stations cesium beams are information can be extracted from the television code used in this exoeriment. used to control the line-10 rate, and time-of-coincidence" @default.
- W2186602760 created "2016-06-24" @default.
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- W2186602760 date "1972-01-01" @default.
- W2186602760 modified "2023-09-24" @default.
- W2186602760 title "Nationwide Precise Time and Frequency Distribution Utilizing an Active Code Within" @default.
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