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The ARRL's "Antenna Book" makes extensive use of EZnec and includes many example files (in .EZ format) to model amateur radio antennas. Opens .EZ files. (EZnec also works on Linux using Wine, or on Raspberry Pi using Wine inside ExaGear). 4nec2 - A free NEC2/NEC4 implementation for Microsoft Windows.
William Ittner Orr (1919–2001) was an engineer, educator, communicator, and ham radio operator. [1] [2] [3] He was the American author of numerous amateur radio and radio engineering texts.
The ARRL publishes various technical books and online courses. Members of the organization also have access to a special Members Only section of the ARRL web site that includes technical documents, expanded product reviews of amateur radio equipment, expanded contesting information, and a searchable database of all league publications.
A Goubau line or Sommerfeld–Goubau line, [1] or G-line for short, is a single-wire transmission line used to conduct radio waves at UHF and microwave frequencies. [2] [3] [4] The dielectric coated transmission line was invented by F. Harms [5] in 1907 and George J. E. Goubau [6] in 1950, based on work on surface waves on wires from 1899 by Arnold Sommerfeld.
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] It is used by amateur radio operators, shortwave listeners, longwave radio DXers and for military applications.
Karl Rothammel (1914 – 1987) was an amateur radio enthusiast, author and educator. He published articles in the journal Radioamatér for five years, and authored several books including Very High Frequencies and Practice of the Television Aerials.
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When the antenna is fed at some other point, the formula requires a correction factor discussed below. In a receiving antenna the radiation resistance represents the source resistance of the antenna, and the portion of the received radio power consumed by the radiation resistance represents radio waves re-radiated (scattered) by the antenna. [8 ...
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