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Heavy-duty ham rotators are designed to turn extremely large, heavy, high frequency beam antennas, and cost hundreds or possibly thousands of dollars. In the center of the reference picture, the accompanying image includes an AzEl installation rotator, so named for its controlling of both the azimuth and the elevation components of the ...
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Miller Industries is an American tow truck and towing equipment manufacturing company based in the Chattanooga suburb of Ooltewah, Tennessee.Its primary subsidiary, Miller Industries Towing Equipment Inc., manufactures a variety of light- to heavy-duty wreckers, car carriers, and rotators under several brand names, including Century, Vulcan, Chevron, and Holmes.
Thrust bearings are also used with radio antenna masts to reduce the load on an antenna rotator. One kind of thrust bearing in an automobile is the clutch "throw out" bearing, sometimes called the clutch release bearing. [4] [clarification needed] [5] [6]
The antenna used for broadcasting through the 1920s was the T-antenna, which consisted of two masts with loading wires on top, strung between them, requiring twice the construction costs and land area of a single mast. [2] (pp 77–78) In 1924 Stuart Ballantine published two historic papers which led to the development of the single mast antenna.
Rebuilt in 2003, the new tower has almost the same height, i.e. 326.8 m (307.1 m for the structure, but the antenna is shorter (19.7 m)). Angara transmitter, Northern Mast, Angara, Russia June 6, 2001: Guyed steel lattice mast carrying a T-antenna 205 Deteriorated support guys World Trade Center North Tower, New York City, NY September 11, 2001