In order to transmit the exact time of an atomic clock e.g. to radio clocks (radio wristwatches, radio wall clocks or radio alarm clocks) but also to radio and TV transmitters there are worldwide different time signal transmitters. They are special transmitters that are usually linked to the atomic clock and transmit the current time as information in digital form to suitable reception facilities. The time signals have a large range, which are transmitted in the long, medium or short wave range. Thus the correct time is always displayed on the clocks and devices within range of the transmitters. In most cases, they also transmit coded information on the calendar date and weekday, so that these are always up to date.
The time signal services are networked with the highest precision, so that they match worldwide in the range far below nanoseconds.
Suction. Multifrequency radio clocks can even receive the signals of several time signal transmitters (usually DCF, MSF, JJY and WWV) and thus synchronise the time in large parts of the world.