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Broadcasts were originally dedicated to 6 kc in all cities, and all regular broadcast stations (AM, FM and TV) were to go silent when threatening information was aired.

EBS replaced CONELRAD in 1963, and EAS replaced EBS in 1997.

Kahn Communications is working on improvements to their original AM Stereo concept. Format: Southern Gospel (1986-90,) Black Christian Gospel (1990-5/18/1998,) Spanish/Ethnic/Spanish Religious (5/18/1998-2004; as "La Poderosa," 2004-present.) Calls stand for exas.

Ibiquity, another player who is developing solutions to the substandard sound, is currently marketing a digital broadcasting system for AM stations (known as IBOC/HD.) HD receivers are already being sold, despite limited station participation. Owner: Multicultural Broadcasting ("MRBI," 2004-present; Multicultural bought out all Radio Unica stations after Unica went bankrupt in 2003.) Former owners: Way Broadcasting (bought 4/19/2000,) Freedom Network, Radio Unica.

AM's popularity and far-reaching capabilities were used by the government to launch a civil defense system, CONELRAD ("CONtrol of ELectromagnetic RADiation,") the forerunner of the Emergency Broadcast System (now Emergency Alert System,) in 1951.

(WRR engineer Rick Teddlie co-created the CONELRAD system.) While the nuclear threat of the Cold War prompted the dedication of a national broadcast frequency, it wasn't until 1958 that the system was first used for weather alerts.

Powerhouse WBAP was awarded a clear channel position on the dial; it is one of only a small handful of stations in the nation that's allowed to blast its signal to a reported 42 states!