Otakadoyayama Transmitter, 日本の福島県にある標準時の電波送信所
The Otakadoyayama Transmitter is a broadcasting station on a mountain peak in Tamura that continuously sends time signals across Japan. It features large umbrella-shaped antennas, a 250-meter tower, and operates with precise atomic clocks to ensure the accuracy of transmitted time signals.
The station started operating in the 1940s as a shortwave broadcaster sending time signals on various frequencies. Over the decades, it transitioned to longwave signals to provide more reliable time synchronization across Japan.
The transmitter serves as an invisible backbone for timekeeping across Japan, with its signals reaching radio clocks in homes and offices daily. People rely on devices powered by this station's broadcasts without ever knowing where the signal originates.
The transmitter sits on a mountain peak near Tamura and is protected by fences, though the antennas and landscape remain visible from outside the perimeter. The site is relatively accessible, but it is designed for technical operation rather than visitor experience.
The station was evacuated and powered down during the 2011 earthquake and tsunami, yet its recovery proved critical in restoring accurate time synchronization across Japan after the disaster. This reveals how dependent the entire national infrastructure is on this invisible system.
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