Berlin is the capital and the largest city of Germany, as well as one of its 16 constituent states.
In broadcasting and radio communications, a call sign (also known as a call name or call letters—and historically as a call signal—or abbreviated as a call) is a unique designation for a transmitter station.
East Germany, officially the German Democratic Republic (GDR; Deutsche Demokratische Republik, DDR), existed from 1949 to 1990 and covers the period when the eastern portion of Germany existed as a state that was part of the Eastern Bloc during the Cold War period.
High frequency (HF) is the ITU designation for the range of radio frequency electromagnetic waves (radio waves) between 3 and 30 megahertz (MHz).
Nauen Transmitter Station (German: Grossfunkstelle Nauen or Sender Nauen) in Nauen, Havelland district, Brandenburg, Germany, is the oldest continuously operating radio transmitting installation in the world.
A time signal is a visible, audible, mechanical, or electronic signal used as a reference to determine the time of day.