Condition as a Vintage but good 1 pcs of 12
Inscription: Do not touch the traction wires - danger to life.
Common warning boards had dimensions of ca. 18/25 cm.
Such large boards were made especially for the mast. They were to be visible from a long distance. About 12 pieces were made.
The Warsaw Radio Mast was the world's tallest structure from 1974 until its collapse on August 8, 1991 It is the second tallest structure ever built, being surpassed as a tallest by the Burj Khalifa, completed in 2010.
The mast, which was designed by Jan Polak, was 646.38 meters (2,120.7 ft) tall. Its construction, started in July 1970, was completed on May 18, 1974, and its transmitter entered. It was located in Konstantynów, Gąbin, Poland, and was used by Warsaw Radio-Television (Radio and Television Center) for longwave radio broadcasting on a frequency of AM-LW (long wave) 227 kHz before 1 February 1988 and AM-LW ( long wave) 225 kHz afterwards. Its base was 115.2 meters (378 ft) above sea level. Because a voltage potential of 120 kV existed between the mast and ground, it stood on a 2-meter (6.6 ft) -high insulator. It operates as a mast radiator (half-wave radiator), so it has a high frequency wavelength antenna at its broadcasting frequency. The signals from its 2 megawatt transmitters could be received across essentially the entire globe. Its weight was debated: Polish sources claimed 420 tonnes (930,000 lb).
DPD or IW-Juch Co.
|Lid sinds:||9 november 2017|
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