which became known as "Clear", "Regional" and "Local". WWJ was tentatively assigned to a clear channel frequency of 820 kHz, which would have permitted operation with up to 50,000 watts. However, the station's management was unprepared to bear the cost of a major transmitter upgrade, and instead settled for assignment to one of the regional frequencies, 920 kHz (325.9 meters), with a transmitter power of 1,000 watts, the maximum permitted at the time for regional frequencies. 1930s and 1940s In 1937 WWJ became one of the first stations to increase its power to the new maximum of 5,000 watts for regional frequencies. On March 29, 1941, as part of the North American Regional Broadcasting Agreement (NARBA) frequency reassignments, the station moved to 950 kHz, where it remains to this day. The programming throughout this time was focused on variety. During the 1940s, WWJ transmitted most of the NBC Red Network schedule, along with locally produced news, entertainment and music programming. After World War II, especially as television grew in household reach and popularity, music and regularly scheduled local news would make up a larger portion of its format as television eroded support for variety programming on radio and the Golden Age of Radio gradually ended. The Federal Communications Commission (FCC) was interested in increasing the number of broadcasting outlets, and began licensing "Apex" stations, operating on higher transmitting frequencies than the original AM band. On January 29, 1936, the Detroit News activated its own Apex station, W8XWJ, initially broadcasting at 31.6 MHz and relaying WWJ's programs. As with WWJ, W8XWJ used amplitude modulation (AM), but it was also engineered to transmit in high-fidelity. The FCC ultimately decided that the second broadcast band would use frequency modulation (FM), so W8XWJ ceased operating in early 1940, as the News prepared to replace it with an FM station. On May 10, 1941, that new station, W45D, debuted as Michigan's first FM station, which would later undergo five call letter changes – to WENA, WWJ-FM, WJOI, WYST and WKRK – before becoming WXYT-FM. WWJ also got into the nascent medium of television when WWDT began service on October 23, 1946, for one day of demonstrative programming; regular programming commenced on March 4, 1947, with the call letters changing to match the radio station, WWJ-TV two months later on May 15, and has been affiliated with the NBC television network since its sign-on, owing to