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 D 
DCF77
DCF77 is a longwave time signal broadcast station at Mainflingen, Germany, about 25 km south-east of Frankfurt (50°01' North, 09°00' East). The DCF77 radio signals are derived from an atomic clock, and broadcasted on 77.5 kHz. The signal can be received up to a distance of 2000 km and more. There are 2 transmitters installed, so in case of failure of the first one it is possible to use the reserve system.

The callsign "DCF77" stands for D=Deutsch (German), C=long wave signal, F=Frankfurt, 77=frequency: 77.5 kHz. The transmitter is controlled by the Physikalisch-Technische Bundesanstalt (PTB) in Brauschweig, Germany. More specific information can be found at DCF77 info.



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DCF77