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Austin ring transformer at the base of a WMCA and WNYC transmitting tower in Kearny, New Jersey. The two interlocking rings are the primary and secondary transformer windings. The spherical objects directly below and to the right of the windings are a spark ball gap, for lightning protection.
When lightning strikes a metal tower or strikes near a building containing electrical equipment, a large, rapidly changing magnetic field is generated. This magnetic field induces current onto power lines, often disrupting electrical service, and also induces current into other electrical conductors such as electrical equipment and even ...
A mast radiator (or radiating tower) is a radio mast or tower in which the metal structure itself is energized and functions as an antenna. This design, first used widely in the 1930s, is commonly used for transmitting antennas operating at low frequencies , in the LF and MF bands, in particular those used for AM radio broadcasting stations.
AM radio broadcast towers are often fitted with insulators at the mast base and the RF energy is fed at that point. Some are also insulated at the center for feeding the RF energy at that point. Wire rope guys are frequently used and segmented with insulators at several points. Extensive lightning protection is required for insulated towers.
The building may also contain lightning protection devices and power transformers for aircraft warning lights on the tower. The radio transmitter which generates the radio frequency current which powers the antenna is generally located away from the antenna, to prevent the powerful radio waves from interfering with the sensitive transmitter ...
[citation needed] To perform adequately, the counterpoise should extend at least half a wavelength from the antenna tower in all directions. [8] In designing a counterpoise for a medium-wave radio station, for example, radio-waves are a maximum of 566 metres (1,857 ft) long. Therefore, the counterpoise should extend 282 metres (925 ft) from the ...
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U.S. Patent 1,968,868 for an insulated radio tower. In the late 1920s, AM radio station WHK in Cleveland, Ohio was investigating ways to improve their signal coverage.Chief engineer E. L. Grove believed that the station's poor signal coverage was due to the effect of other steel-frame buildings in the vicinity of their transmitter site atop a downtown office building, poor grounding, and power ...
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