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Blaw-Knox towers Those few of the towers still standing do the opposite: They have a guyed lower section surmounted by a freestanding part. Zendstation Smilde is a tall tower with a guyed mast on top with guys which go to ground. Torre de Collserola is a guyed tower with a guyed mast on top where the tower portion is not free-standing.
In such cases the antennas for directional radio services are mounted on the top of the free-standing part of the tower, while the guyed mast on its top carry the FM and TV antennas. They can be also used in order to upgrade small stable towers (like watertowers) with a long antenna mast for FM and TV broadcasting.
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.
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.
Free standing wood lattice tower 75 Storm Two towers snapped off 25 metres above ground Langenberg, Germany October 10, 1935: Free standing wood lattice tower 150 Tornado Replaced by triangle antenna Liechtenstein-Haberfeld transmitter November 21, 1938: Storm Utbremen Radio Tower, Bremen, Germany 1939: Free standing wood lattice tower 90 Lightning
The WBNS TV Tower is a 839 ft (256 m) [1] tall free-standing lattice tower with a triangular cross section used by WBNS-TV in Columbus, Ohio. When originally completed in August 1948, the tower stood 595 ft (181 m) tall [ 2 ] making it one of the tallest freestanding towers in the United States at that time.
The LORAN-C scheme closed in 1994. In 1991, the original RÚV 1930 longwave transmitter tower at Vatnsendi (near Reykjavík) collapsed. As the Hellissandur mast was free for use, it was converted for use by RÚV (The Icelandic National Broadcasting Service) for its longwave transmissions on 189 kHz at a power of 300 kilowatts in the 1997. [2] [3]
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]
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