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Homebrew is an amateur radio slang term for home-built, noncommercial radio equipment. [1] Design and construction of equipment from first principles is valued by amateur radio hobbyists, known as "hams", for educational value, and to allow experimentation and development of techniques or levels of performance not readily available as commercial products.
Vintage amateur radio is a subset of amateur radio hobby where enthusiasts collect, restore, preserve, build, and operate amateur radio equipment from bygone years, such as those using vacuum tube technology.
[6] [7] Even prior to 1976, a similar woodpecker-style interference is remembered by radio amateurs occurring in the high frequencies. As early as 1963, or before, radio amateurs were calling this "the Russian Woodpecker". [8] Little is known about the power levels or Russian designation but it was probably a forerunner of the Duga radar systems.
Although the superheterodyne receiver is the most common receiver in use today [citation needed], the regenerative radio made the most out of very few parts. In World War II the regenerative circuit was used in some military equipment. An example is the German field radio "Torn.E.b". [34]
Curtain arrays were originally developed during the 1920s and 1930s when there was a lot of experimentation with long distance shortwave broadcasting. The underlying concept was to achieve improvements in gain and/or directionality over the simple dipole antenna, possibly by folding one or more dipoles into a smaller physical space, or to arrange multiple dipoles such that their radiation ...
By 1928, RCA had scrapped plans for more longwave transmitters and instead built six shortwave transmitters, 2XT and WTT at 40 kw and WBU, WIK, WQO and WLL at 20 kw. The Radio Central complex was used to relay international broadcast programming received by, or sent from, RCA's broadcast stations in the United States.
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The AT&T receiving Beverage antenna (left) and radio receiver (right) at Houlton, Maine, used for transatlantic telephone calls, from a 1920s magazine. The Beverage antenna or "wave antenna" is a long-wire receiving antenna mainly used in the low frequency and medium frequency radio bands, invented by Harold H. Beverage in 1921. [1]