DCF77

DCF77 is a longwave time signal radio station. The callsign stands for D=Deutschland (Germany), C=long wave signal, F=Frankfurt, 77=frequency: 77.5 kHz. It is run by The Physikalisch-Technische Bundesanstalt.

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DCF77 radio signals (set by an atomic clock) are broadcast on 77.5 kHz from Mainflingen, Germany, about 25 km south-east of Frankfurt. The signal can be received from a distance of 2000 km. There are two transmitters so it is rarely off the air.

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Radio clocks are popular in this region and use DCF77's signal to set their time automatically.

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Longwave: :Longwave can also refer to the economics concept of Kondratiev waves, also called cycles, surges, or K-waves, or to the rock band Longwave....

Time signal: A time signal is a visible, audible, mechanical, or electronic signal used as a reference to determine the time of day....

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