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A radio mast base showing how virtually all lateral support is provided by the guy-wires. The terms "mast" and "tower" are often used interchangeably. However, in structural engineering terms, a tower is a self-supporting or cantilevered structure, while a mast is held up by stays or guy-wires. [1] A mast
Series excited (base feed): the mast is supported on an insulator, and is fed at the bottom; one side of the feedline from the helix house is connected to the bottom of the mast and the other to a ground system under the mast. This is the most common feed type, used in most AM radio station masts. [4] [6]
The Warsaw Radio Mast (centre) from a distance (as pictured in 1989) Warsaw Radio Mast compared with some other tall structures The Warsaw Radio Mast (Polish: Maszt radiowy w Warszawie) was a radio mast located near Gąbin, Poland, and was the world's tallest structure at 2,120 ft (646.30 m) from 1974 until its collapse on 8 August 1991. [1]
Cellular lattice tower A cell tower in Peristeri, Greece. A cell site, cell phone tower, cell base tower, or cellular base station is a cellular-enabled mobile device site where antennas and electronic communications equipment are placed (typically on a radio mast, tower, or other raised structure) to create a cell, or adjacent cells, in a cellular network.
Diagram of towers VLF transmitter masts as seen from nearby Bundegi Beach. The station features thirteen tall radio towers.The tallest tower is called Tower Zero and is 387.4 metres (1,271 ft) tall, and was for many years the tallest human-made structure in the Southern Hemisphere. [3]
A guyed radio mast. A guyed mast is a tall thin vertical structure that depends on guy lines (diagonal tensioned cables attached to the ground or a base) for stability. The mast itself has the compressive strength to support its own weight, but does not have the shear strength to stand unsupported or bear loads.
The diamond-shaped tower was patented by Nicholas Gerten and Ralph Jenner for Blaw-Knox July 29, 1930. [5] and was one of the first mast radiators.[1] [6] Previous antennas for medium and longwave broadcasting usually consisted of wires strung between masts, but in the Blaw-Knox antenna, as in modern AM broadcasting mast radiators, the metal mast structure functioned as the antenna. [1]
Two masts WLHR-FM Radio Tower Lavonia, GA, US January 30, 2010: Guyed steel lattice mast 86 Sabotage Guyed wires cut a MW mast [28] and 3 SW masts [29] in Qinghai Transmitting Station 920, Gyêgu, Yushu, Qinghai, China: April 14, 2010: Guyed steel lattice mast (MW) Guyed steel tubular mast (SW) 76 (MW) & 25 (SW) 2010 Yushu earthquake