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The ground-hugging waves allowed the signals to travel beyond the horizon, out to hundreds of kilometers. However the newer FM and TV transmitters used the VHF band, in which radio waves travel by line-of-sight, so they are limited by the visual horizon. The only way to cover larger areas is to raise the antenna high enough so it has a line-of ...
Mast radiators radiate vertically polarized radio waves, with most of the power emitted at low elevation angles. In the medium frequency (MF) and low frequency (LF) bands AM radio stations cover their listening area using ground waves, vertically polarized radio waves which travel close to the ground surface, following the contour of the ...
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]
RCA contractor for erection, stainless subcontractor. No definitive cause ever found for collapse. Speculation of "galloping guy lines" (mechanical standing waves in one of the guys), causing stress-to-failure in the guys due to rapidly alternating strain. TV mast of Shaanxi No.9 Transmitting Station, Chang'an, Xi'an, Shaanxi, China: December ...
The Lakihegy Tower is a 314-metre-high (1,031 ft) radio mast at Szigetszentmiklós-Lakihegy in Hungary. The Blaw-Knox type tower was built in 1933 and was one of Europe's tallest structures at the time of construction. It was designed to provide broadcast coverage for Hungary with a 120 kW transmitter.
Radio towers and masts that have been demolished or destroyed due to engineering error, replacement, or controlled demolition. Some of the radio masts could be either unfinished or abandoned. Pages in category "Former radio masts and towers"
A tower array is an arrangement of multiple radio towers which are mast radiators in a phased array. [1] They were originally developed as ground-based tracking radars. [2] Tower arrays can consist of free-standing or guyed towers or a mix of them. Tower arrays are used to constitute a directional antenna of a mediumwave or longwave radio station.
The Telefarm Towers is a transmission site for FM radio and television broadcasting in Shoreview, Minnesota consisting of two guyed towers.. The towers, called Shoreview Towers by local residents, are owned by Telefarm, Inc., a joint venture of Twin Cities broadcasters CBS Television Stations (WCCO channel 4), Hubbard Broadcasting (KSTP channel 5, KSTC channel 5.2, KSTP-FM 94.5 FM, and KTMY ...