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DCF
The DCF77 radio controlled clocks receive the official time of the Federal Republic of Germany from Physikalisch-Technischen Bundesanstalt (PTB) in Braunschweig. The radio synchronisation of the DCF77 transmitter in Mainflingen (50 01 N, 9 00 0) reaches a long-term accuracy of the PTB-calibration standard of 1 x 10 E-13 per week or less than 1 second in 300,000 years. Due to its high accuracy, only this
time is accepted as legally binding in the Federal Republic of Germany.