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The National Radio Quiet Zone ( NRQZ) is a large area of land in the United States designated as a radio quiet zone, in which radio transmissions are restricted by law to facilitate scientific research and the gathering of military intelligence. About half of the zone is located in the Blue Ridge Mountains of west-central Virginia while the ...
Radio broadcasting has been used in the United States since the early 1920s to distribute news and entertainment to a national audience. In 1923, 1 percent of U.S. households owned at least one radio receiver, while a majority did by 1931 and 75 percent did by 1937. [ 1][ 2] It was the first electronic "mass medium" technology, and its ...
Radio stations in United States have evolved since their early twentieth-century origins. In 1920 8MK started operations in Detroit; after it, thousands of private and public radio have operated in the United States.
A topographic map of the United States. The United States is the world's third-largest country by total area behind Russia and Canada. [d] [165] [166] The 48 contiguous states and the District of Columbia occupy a combined area of 3,119,885 square miles (8,080,470 km 2).
Shortwave broadcasting in the United States. Shortwave broadcasting in the United States allows private ownership of commercial and non-commercial shortwave stations that are not relays of existing AM/MW or FM radio stations, as are common in Africa, Europe, Asia, Oceania except Australia and Latin America. In addition to private broadcasters ...
The following is a list of radio stations in the United States that are authorized to run 50 kW (50,000 watts) of power. This is the highest power authorized to any AM station in the United States. Power Legend: U=unlimited time, D=daytime power, N=nighttime power, CH= critical hours power.
Consisted of 27 stations (3 owned and operated and up to 24 "phantom stations" – time leased on affiliated radio stations. WEAF chain. Broadcasting Company of America. Northeast and Midwest United States. 1923–1926. Regional network of AT&T -owned radio stations with New York City radio station WEAF as its hub.
In the United States, radio stations are assigned callsigns that either start with K (for those located west of the Mississippi River), or W (for those located east of the Mississippi River). AM radio stations by call sign (starting with KA–KF)