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Tallest Radio Tower

May 7th Fact-of-the-Day

The 2,120 foot (646 meter) Warsaw Radio tower in Konstantynw, Poland was not only the tallest radio tower ever built, it was the tallest structure ever built. It was completed in 1973, but collapsed in 1991 while being renovated, killing three people and injuring twelve. The original transmitting frequency was 227 kHz, but was later changed to 225 kHz. The mast was one-half-wavelength high at the transmitting frequency and therefore had a very high base-impedance. Because the transmitting power was two-megawatts, it was necessary to stand the tower on a two-meter-high base insulator that had a 120 kV break-over voltage. The transmitter building was approximately 600 meters from the tower base. It contained two one-megawatt transmitters constructed by Brown-Boveri and Cie that were operated in-phase to produce two-megawatts of amplitude-modulated RF power. ©2005 Martek International All rights reserved.

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