North American Regional Broadcasting AgreementThe North American Regional Broadcasting Agreement (NARBA, French: Accord régional sur la radiodiffusion en Amérique du Nord; Spanish: Convenio Regional Norteamericano de Radiodifusión) refers to a series of international treaties that defined technical standards for AM band (mediumwave) radio stations. These agreements also addressed how frequency assignments were distributed among the signatories, with a special emphasis on high-powered clear channel allocations.
General Order 40The Federal Radio Commission's (FRC) General Order 40, dated August 30, 1928, described the standards for a sweeping reorganization of radio broadcasting in the United States. This order grouped the AM radio band transmitting frequencies into three main categories, which became known as Clear Channel, Regional, and Local. It also included provisions for coordination with Canadian station assignments.
Regional Agreement for the Medium Frequency Broadcasting Service in Region 2The Regional Agreement for the Medium Frequency Broadcasting Service in Region 2, commonly known as the Rio Agreement, is an international treaty defining standards for AM band (mediumwave) radio stations. It was signed in Rio de Janeiro, Brazil, on 19 December 1981 and took effect on 1 July 1983 at 08:00 UTC.
Interference (communication)Problems playing this file? See .In telecommunications, an interference is that which modifies a signal in a disruptive manner, as it travels along a communication channel between its source and receiver. The term is often used to refer to the addition of unwanted signals to a useful signal.
SkywaveIn radio communication, skywave or skip refers to the propagation of radio waves reflected or refracted back toward Earth from the ionosphere, an electrically charged layer of the upper atmosphere. Since it is not limited by the curvature of the Earth, skywave propagation can be used to communicate beyond the horizon, at intercontinental distances. It is mostly used in the shortwave frequency bands.
Transmitter power outputIn radio transmission, transmitter power output (TPO) is the actual amount of power (in watts) of radio frequency (RF) energy that a transmitter produces at its output. TPO is a concept related to effective radiated power (ERP), but refers to the power output of a transmitter, without accounting for antenna gain. The ERP for VHF/UHF transmitters is normally more than the TPO, for LF/MF transmitters it has nearly the same value, while for VLF transmitters it may be less.XEW-AMXEW-AM (900 kHz) and XEW-FM (96.9 MHz) are commercialradio stations in Mexico City, Mexico, simulcasting a news/talkradio format branded as W Radio. XEW serves as the flagship for other "W Radio" stations around Mexico that carry some or all of its programs. The stations feature frequent news segments, talk and sports shows, and musical programming during overnights and weekends.
AM broadcastingAM broadcasting is radio broadcasting using amplitude modulation (AM) transmissions. It was the first method developed for making audio radio transmissions, and is still used worldwide, primarily for medium wave (also known as "AM band") transmissions, but also on the longwave and shortwave radio bands.
Mexico CityCapital and most populous city of MexicoCapital and megacity in MexicoMexico City is the capital and largest city of Mexico, as well as the most populous city in North America. It is one of the world's leading cultural and financial centers and, according to the Globalization and World Cities Research Network's 2024 ranking, is classified as an Alpha world city.
WattThe watt (symbol: W) is the unit of power or radiant flux in the International System of Units (SI), equal to 1 joule per second or 1 kg⋅m⋅s. It is used to quantify the rate of energy transfer. The watt is named in honor of James Watt (1736–1819), an 18th-century Scottishinventor, mechanical engineer, and chemist who in 1776 improved the Newcomen engine with his own steam engine, which became fundamental for the Industrial Revolution.
Cuban RevolutionThe Cuban Revolution (Spanish: Revolución cubana) was the military and political movement that overthrew the dictatorship of Fulgencio Batista, who had ruled Cuba from 1952 to 1959. The revolution began after the 1952 Cuban coup d'état, in which Batista overthrew the emerging Cuban democracy and consolidated power. Among those who opposed the coup was Fidel Castro, then a young lawyer, who initially tried to challenge the takeover through legal means in the Cuban courts.
Radio broadcastingRadio broadcasting is the transmission of signals, especially audio, to receivers using radio waves over a wide area. Listeners require a broadcast radio receiver to receive these signals. "Terrestrial" broadcasts come from stations on land, and include AM and FM (both analog); and DAB (digital). Audio is also broadcast via satellite in both digital and analog, originating from a satellite in orbit around Earth.*As an Amazon Associate I earn from qualifying purchases.