CKDO

CKDO is a Canadian Class A clear-channel radio station, broadcasting at 1580 kHz in Oshawa, Ontario. The station airs an oldies format. CKDO also has an FM rebroadcaster in Oshawa, CKDO-FM-1, at 107.7 MHz. CKDO is one of only two radio stations in Canada that broadcast at 1580; the other is CBPK, a 50-watt weather information station in Revelstoke, British Columbia.
History.
CKDO was launched in 1946 by T. W. Elliott, an executive with the Canadian division of General Motors. Its original frequency was 1240.
In 1950, Elliott sold the station to Lakeland Broadcasting, who adopted the new callsign CKLB. The station moved to AM 1350 in 1956. The following year, Lakeland launched an FM sister station, CKLB-FM. In 1979, the stations were acquired by Grant Broadcasting, and CKLB adopted the new call sign CKAR. (The former CKAR call sign is now used at a radio station in Huntsville, Ontario).
In 1990, Grant Broadcasting sold the stations to Power Broadcasting. In 1992, Power readopted the station's original CKDO calls and its current format. In 1996, the station moved to an adult contemporary format, sometimes simulcasting the programming of its FM sister station and other times airing its own distinct programming schedule.
In 2000, Corus Entertainment acquired the stations. In February 2001, Corus converted CKDO to its short-lived talk radio network (also consisting of CHML in Hamilton, CFPL in London, CKRU in Peterborough, CFFX in Kingston and CJOY in Guelph), but the station returned to the oldies format by the summer of that year.
In 2003, CKDO and CKGE were acquired by their current owner, Durham Radio Inc.
Durham established the FM rebroadcaster in 2005. The station had originally been approved by the CRTC in 2004, conditional on choosing a different frequency than 107.7, for which the station had originally applied.
On August 13, 2006, CKDO moved from 1350 to 1580, a Class A "clear-channel" frequency. The station operates at the bare minimum power required to use a clear-channel frequency (10 kilowatts).
The CKDO call sign was also used by an unrelated station in Baie-Comeau (Quebec), which operated at 92.5 FM from 1988 to 1991.