This article presents the Konstantynów Radio Transmitting Centre - Poland's leading longwave radio broadcasting facility, active between 1974 and 1991 - and its transmitter, the Brown Boveri SL 61 B3. Composed of two parts of 1000 kW each, it is considered one of World's most powerful radio transmitters. Having a five-staged modulator, three-staged high-frequency power circuit, nuclear standard frequency generators, microwave (5.6 GHz) modulation signal acquisition and elaborated automated control system, it presented the leading technology of radio broadcasting in the 2nd half of the XX century. Its high significance, both historic and technological, led to the unprecedented action of moving the entire (!) transmitter from the Centre (seriously dilapidated after the collapse of the World's highest radio mast in 1991 due to errors in renovation) to the Babice Transatlantic Radio Station Culture Park Association with the cooperation with the Warsaw University of Technology and other entities. The transmitter, despite the damages caused by devastations and thefts, shall be renovated as a functioning historic equipment with the possibilities of its use for research purposes.
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