WHAS (840 kHz) is an AM radio station owned by iHeartMedia, Inc. and licensed to Louisville, Kentucky. Its studios are located in the Louisville enclave of Watterson Park, and the transmitter site is in Long Run, in far east Jefferson County. First licensed in July 1922, it is the oldest radio station in Kentucky. WHAS is a clear channel station, operating around the clock on 840 kHz with 50,000 watts. Its daytime signal can be heard in almost all of central Kentucky, as well as large slices of Ohio and Indiana, providing city-grade coverage as far east as Lexington, as far south as Bowling Green, and as far north as Cincinnati. Secondary coverage extends as far as Nashville, Dayton, and Indianapolis. The nighttime signal can be heard with a good radio in most of the continental United States and much of Canada, and at times in other countries. Since September 2007 WHAS has also broadcast full-time using the HD Radio IBOC digital radio system, following an initial testing period which started in 2006. HD Radio has since been turned off. Prior to 1995, WHAS broadcast in C-QUAM AM stereo. History The U.S. Department of Commerce, which regulated radio communication at this time, adopted regulations, effective December 1, 1921, that formally established a broadcast service category, designating the wavelength of 360 meters (833 kHz) for "entertainment" broadcasting, and 485 meters (619 kHz) for "market and weather reports". On July 13, 1922, the Courier-Journal and Louisville Times were issued a license for the first broadcasting station in Kentucky, which was assigned the sequentially issued call letters of WHAS, for operation on both the 360- and 485-meter wavelengths. Kentucky was the 45th out of the then-48 states to establish a broadcasting station. Following a short series of test transmissions, WHAS made its formal debut broadcast on July 18, 1922. On May 16, 1925, the first live broadcast of the Kentucky Derby horse race was made by WHAS and also by WGN in Chicago. The call of the Derby featured an announcer who watched from the windows of one of the famous twin spires of Churchill Downs. On November 11, 1928, the Federal Radio Commission's (FRC) General Order 40 made a major reallocation of the broadcasting frequencies. This introduced a category known as "clear channel stations" that included WHAS, which was assigned exclusive nationwide use of 820 kHz. On May 15, 1932, WHAS changed