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(By mid-1922, all five DFW stations agreed to a timesharing plan on each frequency.) November 11, 1928 was declared "National Frequency Allocation Day," when the Federal Radio Commission (FRC, predecessor to the FCC) brought organization to the dial by assigning dedicated frequencies to the strongest stations, and culling out many of the small-time opportunists who weren't serious about broadcasting.AM radio in Dallas-Fort Worth, as with the rest of the nation, was mostly entertainment and news programming in its infancy; however, its value and importance was secured during World War II as the center of information for a concerned public.With the introduction of television to the masses in the late 1940s, radio's demise was assumed to be imminent.This would allow new investors to start new stations from scratch (as the pool of available frequencies was quickly drying up) and would permit existing restricted-signal stations to move into an uncrowded part of the band and beef up their coverage area.
Automakers and consumer electronics manufacturers began adding the extended band to their units in the early 1990s, and existing stations were permitted to simulcast on their new frequencies beginning in the mid-1990s.
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.
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