DCF-77 radio-controlled clock

This applet shows a DCF-77 radio controlled digital clock, realized as a gate-level circuit.
The DCF-77 radio sender is located near Frankfurt in Germany and continuously transmits a 77.5 KHz signal that encodes the local time using amplitude and phase modulation.

The sender is controlled by the high-precision atomic clocks of the German Institute of standards (Physikalische Bundesanstalt in Braunschweig).