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The history of amateur radio, dates from the dawn of radio communications, with published instructions for building simple wireless sets appearing at the beginning of the twentieth century. [1] Throughout its history, amateur radio enthusiasts have made significant contributions to science , engineering , industry , and social services .
The amateur radio service (amateur service and amateur-satellite service) is established by the International Telecommunication Union (ITU) through the Radio Regulations. National governments regulate technical and operational characteristics of transmissions and issue individual station licenses with a unique identifying call sign , which must ...
In ITU Radio Regulations, the range 275 – 3,000 GHz whilst not formally allocated, is subject to footnote 5.565; this was last revised by WRC-12 and the current version is below: 5.565 The following frequency bands in the range 275-1,000 GHz are identified for use by administrations for passive service applications: Radio astronomy service:
Two way radio services take up most of the rest of the geomagnetic spectrum, including marine VHF radio, amateur radio, the aforementioned citizens band, the Family Radio Service and the General Mobile Radio Service. Unlike most one-way broadcast services, these services are generally limited to voice transmission.
1920s: Radio was first used to transmit pictures visible as television. 1926: Official Egyptian decree to regulate radio transmission stations and radio receivers. [40] Early 1930s: Single sideband (SSB) and frequency modulation (FM) were invented by amateur radio operators. By 1940, they were established commercial modes.
Pages in category "Amateur radio history" The following 13 pages are in this category, out of 13 total. ... War Emergency Radio Service; Women in early radio
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During World War II, the Amateur Radio Service had been silenced and a new War Emergency Radio Service (WERS) had to be created from scratch in a process that took six months. The resulting standby RACES service was designed to provide a quicker and smoother transition in the event the President ever needed to silence the regular Amateur Radio ...