initial license, WBAV was authorized to also broadcast on the 485 meter "market and weather" wavelength. In September 1922 the Department of Commerce set aside a second entertainment wavelength, 400 meters (750 kHz) for "Class B" stations that had quality equipment and programming. In May 1923 additional "Class B" frequencies were made available. One of the Ohio allocations was 770 kHz, and WBAV was assigned to this frequency on a time-sharing basis with WJAX in Cleveland. In mid-1924 WBAV was reassigned to 710 kHz, now sharing time with WLW in Cincinnati, which was changed in early 1925 to 1020 kHz, with a new timeshare partner of WEAO in Columbus. In early November 1925, the American Insurance Union took over the station, changing the call letters to WAIU. WAIU was a charter member of the CBS Radio Network, being one of the 16 stations that aired the first CBS network program on September 18, 1927. On June 15, 1927, the newly formed Federal Radio Commission (FRC) reassigned WAIU to 1060 kHz, still sharing time with WEAO. On November 11, 1928, the FRC made a major nationwide reallocation, implementing standards contained in its General Order 40. With these reassignments, most former "Class B" stations were granted a primary status on what were known as "clear channel" frequencies. However, WAIU was reduced to a secondary station on the clear channel frequency of 640 kHz. Also, now a "limited time" station, it had unrestricted daytime operating hours, but its evening hours were limited to operation only until sunset in Los Angeles, California, which was the location of the frequency's primary station, KFI. On July 1, 1936, WAIU's call sign was changed to WHKC, to go with that of then commonly owned WHK in Cleveland. 1945 move from 640 to 610 kHz In August 1941 the Federal Communications Commission (FCC) adopted a "duopoly" rule, which restricted licensees from operating more than one radio station in a city. At this time, in addition to owning WHKC in Columbus, United Broadcasting owned two stations in Cleveland: WHK and WCLE. As part of a successful plan to avoid having to give up one of its Cleveland stations, United arranged for a frequency swap between WCLE, then on 610 kHz, and WHKC on 640 kHz. In order to conform to the duopoly restrictions, WCLE was moved from Cleveland to Akron. In conjunction with this transfer WCLE, which had been