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time signal |
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time signal [′tīm ‚sig·nəl] (communications) An accurate signal which is broadcast by radio and marks a specified time or time interval, used for setting timepieces and for determining their errors; in particular, a radio signal broadcast at accurately known times each day on a number of different frequencies by WWV and other stations. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Wireless time signals existed long before satellites; in fact, telegraphic time signals from ground based transmitters were broadcast beginning in 1903 by the United States Navy [1, 2]. Naval Observatory in Washington and a handful of institutions being run or projected by colleges or urban groups--promised the possibility of supplying accurate time signals for local and regional distribution. Federal and state laws require local governments to time signals to allow a crossing time minimum of one second for every four feet, plus extra time to step off the curb. |
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