Establishment Experimental broadcasts by
Carl Graham Fisher, a Miami Beach developer, began in the spring of 1925. The station was licensed on January 9, 1926, and formally
signed on the air on January 18, 1926. Fisher selected WIOD as the
call sign, signifying the "Wonderful Isle of Dreams" to commemorate Collins Island, where studios and offices were located. WIOD is Florida's seventh-oldest continuously licensed broadcast radio station.
Consolidation with WMBF On February 7, 1925, an earlier station, WMBF, had been licensed to the Fleetwood Hotel Corporation in Miami Beach, with studios on the 16th floor. However, in early 1929 WMBF was consolidated with WIOD, with the combination assigned the dual call sign of WIOD-WMBF. The consolidated station was briefly assigned to WMBF's old frequency of 560 kHz, before moving to 1300 kHz later the same year. In 1937, the station moved to 610 kHz. In 1940, the WMBF call letters were dropped from the dual call sign, and the station became just WIOD. It was an
NBC Red Network affiliate through the 1930s, '40s and '50s, airing NBC's schedule of dramas, comedies, news and sports during the "
Golden Age of Radio". The studios were at 600 Biscayne Boulevard in Miami. In the 1950s, as network programming was moving from radio to television, WIOD switched to a
full service format of
middle of the road music (MOR), news and sports.
Call letter change to WCKR In 1956, a new Miami television station, channel 7 WCKT (now
WSVN), began operation. Its owner was Biscayne Television, which was a joint arrangement with Miami's two daily newspapers, the
Cox-owned
Miami News and the
Knight-owned
Miami Herald. In 1956, Biscayne Television acquired 610 AM, and changed the call sign to WCKR, taking the first letters of Cox, Knight and Radio for its call letters. Branded
Wacker Radio, it broadcast adult pop music by day, but offered
Top 40 hits at night. The station featured noted South Florida disc jockey Rick Shaw. It also carried
NBC Radio's "
Monitor" program on weekends. On April 1, 1963, the station returned to its original call sign of WIOD.
Cuban interference On June 16, 1981, WIOD began operating with 10,000 watts day and night, after having been powered at 5,000 watts, the normal maximum for U.S. stations on "regional" frquencies, for most of its post-war history. This was to counter interference being caused by a high-powered Cuban station. This was permitted by a
special temporary authority (STA) granted by the FCC, that was regularly renewed. On April 6, 2017, WIOD filed an application for an FCC
construction permit to move to a new transmitter site, increase day power to 50,000 watts and increase night power to 20,000 watts. It was accepted for filing the following day. ==Honors and sports==