The wristwatches and clocks that advertise accurate “atomic time” rely on the 60 kHz signal from WWVB in Boulder Colo. to synchronize them to official U.S. time. In the days of analog TV, some ...
National Institute of Standards and Technology radio station WWVB(AM), near Fort Collins, Colo., is conducting another phase-modulated broadcast test beginning at 11 a.m. Pacific on Tuesday, Sept. 4.
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