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The first satellite radio broadcasts occurred in Africa and the Middle East in 1999. The first US broadcasts were in 2001 followed by Japan in 2004 and Canada in 2005. There have been three (not counting MobaHo! of Japan) major satellite radio companies: WorldSpace, Sirius Satellite Radio and XM Satellite Radio, all founded in the 1990s in 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 ...
WWVB is a time signal radio station near Fort Collins, Colorado and is operated by the National Institute of Standards and Technology (NIST). [ 1 ] Most radio-controlled clocks in North America [ 2 ] use WWVB's transmissions to set the correct time. The normal signal transmitted from WWVB is 70 kW ERP and uses a 60 kHz carrier wave yielding a ...
S-band tracking antenna at Kennedy Space Center S-band LNB with written local oscillator frequency. In the United States, the FCC approved satellite-based Digital Audio Radio Service (DARS) broadcasting in the S band from 2.31 to 2.36 GHz in 1995, [2] used by Sirius XM Radio. More recently, it has approved portions of the S band between 2.0 and ...
Hybrid C-/Ku-band satellite 85.2°W XM-5 United States 2015-08-19: 85.1°W XM 3 Rhythm: Boeing 702: United States XM Satellite Radio Holdings: Radio Broadcasting CONUS: 28 February 2005, Zenit-3SL: 85.0°W: AMC-16: Lockheed Martin A2100AXS: United States SES: Direct Broadcasting Canada, United States, Alaska, Hawaii, Mexico: 17 December 2004 ...
Goldstone Observatory in 1963. The Goldstone Deep Space Communications Complex (GDSCC), commonly called the Goldstone Observatory, is a satellite ground station located in Fort Irwin [ 1 ] in the U.S. state of California. Operated by NASA 's Jet Propulsion Laboratory (JPL), its main purpose is to track and communicate with interplanetary space ...
Replaced. Emergency Broadcast System, Local Access Alert. The Emergency Alert System (EAS) is a national warning system in the United States designed to allow authorized officials to broadcast emergency alerts and warning messages to the public via cable, satellite and broadcast television and AM, FM and satellite radio.
A clear-channel station is a North American AM radio station that has the highest level of protection from interference from other stations, particularly from nighttime skywave signals. This classification exists to ensure the viability of cross-country or cross-continent radio service enforced through a series of treaties and statutory laws.