radiotelegraph
51Etymology of ham radio — Ham is an informal term for an amateur radio operator, and, by extension, ham radio refers to amateur radio in general. This use of the word first appeared in the United States during the opening decade of the twentieth century mdash; for example …
52Invention of radio — Great Radio Controversy redirects here. For the album by the band Tesla, see The Great Radio Controversy. Contents 1 Physics of wireless signalling 2 Theory of electromagnetism …
53Arc converter — The arc converter, sometimes called the arc transmitter or Poulsen arc after its inventor Valdemar Poulsen, is a device used to convert DC energy into RF energy. It is now on the list of IEEE Milestones as a historic achievement in electrical… …
54Amalgamated Wireless Australasia Limited — (AWA) was Australia s largest and most prominent manufacturer of radio, telecommunications and audio equipment throughout most of the 20th century. These days it is primarily an ICT services company. HistoryEarlyThe company commenced operations… …
55Flatey, Skjálfandi — Flatey is an island in Skjálfandi bay located about 8.7 kilometers from Húsavík, in northern Iceland. Its name in Icelandic means flat island ; its highest point is only about twenty two meters above mean sea level, hence its name. It is two and… …
56Morse code abbreviations — differ from prosigns for Morse Code in that they observe normal interletter spacing; that is, they are not run together the way prosigns are. From 1845 until well into the second half of the 20th century, commercial telegraphic code books were… …
57Robert Weitbrecht — Robert Haig Weitbrecht was born in Orange, California in 1920. cite web | author=Weitbrecht Communications| title=Birth | date=N/A | work=Dr. Robert Weitbrecht Inventor of the TTY | url=http://www.weitbrecht.com/about wci.phtml| accessdate=2007… …
58Hammarlund — The Hammarlund Manufacturing Company, founded by Oscar Hammarlund in New York City, New York, USA in 1910, initially designed and produced short wave radio equipment. HistoryThe first Hammarlund plant was a loft operation engaged in radio… …
59Amateur radio history — Throughout the history of amateur radio, amateur radio enthusiasts have made significant contributions to science, engineering, industry, and social services. Research by amateur radio operators has founded new industries, built economies,… …
60Title 47 of the United States Code — outlines the role of telegraphy in the United States Code.*: Telegraphs *: Submarine Cables *: Radiotelegraphs *: Radio Act of 1927 *: Wire or Radio Communication *: Communications Satellite System *: Campaign Communications *: National… …
