In May 1940 the FCC authorized a commercial FM band effective January 1, 1941, operating on 40 channels spanning 42–50 MHz. WDRC, Inc. was issued a Construction Permit for a station on 46.5 MHz that was assigned the call sign W65H. Effective November 1, 1943, the FCC modified its policy for FM call letters, and the call sign was changed to WDRC-FM. In 1946, as part of a general relocation to a new FM band allocation, the station was reassigned to 94.3 MHz, and the following year moved to 93.7 MHz.