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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.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!While KLIF posted incredible ratings during the 1950s and 1960s, others like KRLD and WBAP found successful programming niches that catered to older audiences.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.And to honor the art of "DX-ing" (distance listening,) Wednesdays after 3PM were declared "Silent Night" in the '20s...low-powered stations turned off their transmitters so that high-powered stations across the US could be easily received on anyone's dial.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.
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.
This included Kahn Communications (who was at the forefront of AM Stereo development in 1958,) Harris, Motorola, Magnavox and Belar Electronics.
Motorola's C-Quam system was finally chosen by the FCC as the standard in 1993, but, by that time, the luster had worn off.
Attempts to revitalize AM have netted little; AM Stereo was proposed in 1958 and introduced in 1982 to big fanfare; many car manufacturers began to integrate AM Stereo into their radio units, and KRQX-570 became the first local AM Stereo station in 1983.
However, five different companies were pushing their systems to become the broadcasting standard.
Mc Lendon and Todd Storz's simultaneous discovery of the "Top 40" in the 1950s gave radio a special popularity among the younger generation, and his KLIF, along with KBOX and KFJZ, developed formats to capitalize on current music, especially rock and roll.