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Removal of load-bearing diagonals during FM antenna installation Multi-station tower supporting antennas of TV stations WDBO-TV, WFTV, and WMFE-TV, and radio stations WDBO-FM and WDIZ-FM – two workers on tower killed KCRG-TV Tower Walker, Iowa: October 4, 1973: Guyed Steel Tower 598 Tower modifications
The beam waveguide antenna addresses these problems by locating the feed antenna in a "feed house" at the base of the antenna, instead of in front of the dish. The radio waves collected by the dish are focused into a beam and reflected by metal surfaces in a path through the supporting structure to the stationary feed antenna at the base.
For instance, if a radio wave passing a given location has a flux of 1 pW / m 2 (10 −12 Watts per square meter) and an antenna has an effective area of 12 m 2, then the antenna would deliver 12 pW of RF power to the receiver (30 microvolts RMS at 75 ohms). Since the receiving antenna is not equally sensitive to signals received from all ...
An antenna like effect is achieved by periodic swing of electrons from its capacitive element to the ground plane which behaves like an inductor. The authors further argued that the operation of a dielectric antenna resembles the antenna conceived by Marconi, the only difference is that inductive element is replaced by the dielectric material. [5]
ALLISS is a somewhat rotatable antenna system for high power shortwave radio broadcasting in the 6 MHz to 26 MHz range. An ALLISS module is a self-contained shortwave relay station that is used for international broadcasting .
Geneseo, Illinois radio stations WGEN (1500 AM) and WGEN-FM (104.9) are sold to Connoisseur Communications, owner of KJOC, KQCS, WXLP and KBOB with studios in Davenport, Iowa. The FM signal is simply a repeater of KJOC's signal, which has an all-sports format, while the AM signal repeats KBOB (at the time, located at 99.7 FM with a country ...
In 1986 Andrew acquired Scientific Communications, Inc. (SciComm), [10] and Kintec Corp, further acquiring The Antenna Company in 1996. Andrew acquired Channel Master 's Smithfield, North Carolina satellite dish factory, equipment, inventory and intellectual property in an $18 million deal [ 11 ] [ 12 ] after that firm filed for chapter 11 ...
Small rhombic UHF television antenna from 1952. Its broad bandwidth allowed it to cover the 470 to 890 MHz UHF television band. A rhombic antenna is made of four sections of wire suspended parallel to the ground in a diamond or "rhombus" shape. Each of the four sides is the same length – about a quarter-wavelength to one wavelength per ...
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