On February 19, 1922, the "Kansas City Star" signed on experimental station 9XAB, licensed at 833 kHz, at a time when other newspapers in town were also putting radio stations on the air. "Popular Science" magazine noted the station in its March 1922 issue for airing weather and market reports at 11:30 a.m. and 2:00 p.m., and concerts in the evening. The station took the call sign WDAF on May 16, 1922. In the early days of radio, the dividing line between stations holding call letters beginning with a "W" and those with a "K" was the western border of Kansas, which is why its original call sign began with a "W." WDAF bounced around various frequencies, including 750, 730, 680, 820 and 810 kHz. It moved to 610 kHz in 1928, splitting time with station WOQ, before becoming the sole occupant of 610 AM in Kansas City.