are used inter alia. DCF signals are used for example in railways, radio and television stations, computer systems, communications and industry. The DCF signal is also used for synchronizing home clocks and even some wrist watches. Devices using DCF may automatically switch from daylight savings time to winter time and vice versa. Due to the common time zone with DCF, the DCF signal can be successfully used in Poland.

Coils wound on ferrite rods are induction components of selective input circuits. The windings of the antennas together with the capacitors form parallel resonant circuits tuned to the required frequency.