cfhk was originally chlo, an am station broadcasting on 680 khz and with studios in st. thomas, ontario. in 1963, rogers radio broadcasting limited wanted to relocate the frequency of its toronto station, chfi, from 1540 khz, which is a clear-channel frequency assigned to stations in the united states and the bahamas, and as thus, chfi was authorized to broadcast only during the daytime. rogers selected 680 khz as the new frequency, which at that time was occupied by chlo. in the late 1960s, an agreement was reached enabling chfi to commence 24-hour broadcasting on 680, while sharing the frequency with chlo; eventually, chlo would relocate to 1570 khz in the 1970s. chlo had a top 40 music format during the 1960s into the 70s, and was a music of your life station in the mid-1980s. after a number of years as a country station, chlo moved to the fm band in 1994, changing its calls to cfhk-fm. cfhk, known on-air as "the hawk", had a modern rock format, which later evolved into classic rock. the station continued to operate out of st. thomas until the late 1990s.