CHNO-FM

The station began broadcasting on June 24, 1947 on AM 1440. It was a bilingual radio station, airing programming in both English and French, and was an affiliate of both CBC Radio's Dominion Network and Radio-Canada. It was operated by Sudbury Broadcasting, a company owned by F. Baxter Ricard and his wife Alma Ricard, and was the first bilingual radio station in Canada outside of Quebec.

In 1952, the station was the subject of controversy when Ricard refused to permit Local 598 of the International Union of Mine, Mill and Smelter Workers to purchase airtime on the station for a labour-oriented news program, on the grounds that the program represented "Communist propaganda".[1] His objection had less to do with the program's spoken content and more to do with the host's choice of interstitial music between segments, including a song by Paul Robeson.[1]

On November 9, 1954, CHNO moved to AM 900.

In 1957, Ricard opened CFBR on AM 550 as a full-time French-language station, and CHNO switched to full-time English. The licensing of CFBR, which took over the Radio-Canada affiliation from CHNO, made Sudbury Broadcasting the first commercial broadcaster in Canada licensed to operate two AM radio stations in the same city.[2] In 1962, the station became independent following the dissolution of the Dominion Network. On December 31, 1969, CFBR and CHNO swapped frequencies, CHNO moving to 550 and CFBR taking over the 900 slot. On May 14, 1976, the CRTC denied an application by Sudbury Broadcasting Co. Ltd. to change CHNO's frequency from 550 kHz to 570 kHz.[3]

In 1980, Sudbury Broadcasting launched a new FM station CJMX. That same year, CHNO received approval to increase daytime power from 10,000 watts to 50,000 watts with the nighttime power to remain at 10,000 watts and would remain on 550 kHz. Also in 1980, Ricard also became a major shareholder in Mid-Canada Communications. Sudbury Broadcasting continued to operate independently, although it was eventually merged into Mid-Canada Radio in 1985.[4] In 1990, Mid-Canada sold the stations to Pelmorex.[5] Following this sale, CFBR adopted the new call letters CHYC.

In the 1970s and 1980s, CHNO was Northern Ontario's most listened-to and most influential radio station, broadcasting a Top 40 format branded as 55 CHNO, Rock Radio CHNO 55, "Sudbury's Best Rock", and "Sudbury's Hit Music Leader, NO55" (pronounced "N-oh fifty-five"). However, the 1990 launch of CJRQ ended CHNO's dominance, and on July 6, 1992 at 6:00 AM, CHNO flipped to an oldies format as "Oldies 55".[6] After struggling through a variety of formats, including classic rock as AM 55 The Crusher in 1994,[6] country and talk in 1995 and 1996,[6] the station reverted to oldies in 1997.[6] Former program director Scott Jackson, now the manager of CJLF-FM in Barrie, has stated that CHNO and CJMX were the most neglected stations in the entire Pelmorex corporate family during the time that he worked there, despite being the network's nominal flagships.[7]

In 1998, Pelmorex sold CJMX to Telemedia. The following year, Pelmorex sold CHNO and CHYC to Haliburton Broadcasting Group.

At 12:00 AM on January 1, 2006, with little or no warning, the station flipped to a variety hits format branded as Big Daddy 103.9, ending another era of Top 40 music in the Sudbury market. The station's slogan during the Big Daddy period was "Playing Anything". The last song on "Z" was "Lose Yourself" by Eminem, while the first song on "Big Daddy" was "Start Me Up" by The Rolling Stones. General manager Darlene Palmer said the station wanted to offer Sudbury "music you can dance to, sing to, date to, divorce to." Some promotional bumpers for the station featured a stiff-voiced character representing "Big Daddy" himself. The stiff-voiced character was replaced by a new one around the middle of 2008.

In the first quarter BBM ratings for 2006, CHNO's first ratings book under the Big Daddy format, the station regained the #1 status in the Sudbury market for the first time since 1990. However, the move was controversial with some of the station's prior listeners, and in July 2006, just seven months after flipping CHNO to the adult hits format, Newcap applied to the CRTC for a new contemporary hit radio station in the Sudbury market. In the application, Newcap stated that its market research found that a contemporary hit radio station could only be profitable in the market as one station within an ownership cluster, and not as a standalone entity. However, the application was denied by the CRTC on July 12, 2007.[17]

The denial of the proposed CHR/Top 40 station also became controversial, in part because the station that was licensed, CICS-FM, duplicated the format of an existing station in the market, Rogers' CIGM. In July 2008, however, Newcap announced a deal to acquire CIGM from Rogers in exchange for CFDR in Halifax. Both CIGM and CFDR were the sole remaining AM stations in their respective markets, and in both cases the current owner already had the maximum permitted number of FM stations in the applicable market, whereas the acquirer only had a single FM station. Both companies applied to move the stations to FM as part of the trade.[18] This deal was approved on November 24, 2008.[19]

On June 25, 2009, Newcap received approval from the CRTC to increase CHNO-FM's effected radiated power from 11,000 watts to 100,000 watts, to increase the station's antenna height and to relocate the transmitter.[20] On August 17, 2009, the station increased their power to 100,000 watts the same day CHNO-FM's sister station CIGM-FM began on-air tests at 93.5 FM.

On May 21, 2010, at 12:00 AM without warning, the station dropped adult hits and switched to its current classic hits format as Rewind 103.9, playing 1960s, 1970s, 1980s and 1990s music with the slogan "Sudbury's Greatest Hits". The first song after the change was Bob Seger's "Old Time Rock and Roll".[21] In 2011, CHNO-FM aired syndicated programs such as the 1970s reruns of American Top 40 with Casey Kasem, the Classic Countdown with Dick Bartley and the Donny Osmond show. The syndicated daily radio show, Daily Dees, hosted by Rick Dees was heard each weeknight. The station, like most classic hits stations, has evolved to playing more 80's and 90's and currently uses the slogan "Rewind 103.9..70's, 80's and More!".

• Rewind 103.9
• CHNO-FM history – Canadian Communications Foundation
• CHNO-FM in the REC Canadian station database