|City of license||St. Catharines, Ontario|
|Broadcast area||Niagara Region, Greater Toronto Area|
|Branding||1220 CHSC / Radio Uno|
|Slogan||"Niagara's True Variety Station" and "Niagara's All-Time Greatest Hits"|
|First air date||1967|
|Format||adult contemporary and Italian|
|Power||10,000 watts day and night|
CHSC was an AM radio station located in St. Catharines, Ontario, Canada. CHSC broadcast both daytime and nighttime with a radiated power of 10,000 watts at 1220 kHz AM. The signal pushed mainly north and west, but was on a reduced pattern in both easterly and southerly directions due to interference with a co-channel station in Cleveland (WHKW) and with AM 1230 WECK (Cheektowaga), forty miles to the east. CHSC could routinely be heard as far north as parts of cottage country and west beyond Guelph.
CHSC aired a mix of adult contemporary, oldies along with a bit of country typically attracting audiences ages 30 and up, both male and female. CHSC played a mix of 50 per cent gold and 50 per cent current/recurrent of which 45 per cent on average consisted of Canadian content during the broadcast week of Sunday to Saturday.
On July 30, 2010, the Canadian Radio-television and Telecommunications Commission (CRTC) denied the station's application for renewal. As of 2011, the station now broadcasts a full-time Italian language format via Internet streaming and marketed toward the Greater Toronto Area, but has not been licensed to relaunch on the AM band.
In later years, CHSC's program schedule consisted of English and Italian-language spoken word and music programming.
English-language programming ran during the week, interspersed with Italian-language music in the afternoons. 1220 CHSC was one of the last AM stations remaining in Canada that played current charted music. The music was 50% gold and 50% current-recurrent with above the average Canadian content required. The CRTC only required CHSC to play 35 per cent Canadian content over the course of the broadcast week (Sunday to Saturday) but CHSC averaged about 45% during the broadcast week.
Spoken word programming consisted largely of news updates at the top of each hour from 6 a.m. till 6 p.m. on weekdays, and the It's Your Call Sports Show on Monday nights. Italian-language programming branded as Radio Uno began at 9am Saturdays and ran right through till 6am Monday morning when programming reverted to English.
CHSC also experimented with other third-language programming. During about three months of 2008 South-Asian Dhoom (Hindu music and chat) aired weekdays in the last couple of hours before noon and at the supper hour for about three hours. Caribbean Connection, a mix of soca music and English-language chat aired on Saturdays and Sundays during the supper hour for three hours on Saturday and two hours on Sunday. Both South-Asian Dhoom and Caribbean Connection were eventually cancelled.
In the summer 2008, the Queenston Street building, which housed CHSC's studio and offices since its founding, were seized by bailiffs and all of the contents were auctioned off. This was allegedly due either to large sums of unpaid rent and taxes; to physical deterioration, according to documents filed by the station owner with the CRTC; or both.
The CRTC announced a January 2009 hearing to inquire into format violations, missing financial statements, logger tapes, the loss of the studio, and the station's allegedly being operated from Woodbridge, a suburb of Toronto, rather than St. Catharines. CHSC's web site is a mere welcome message and a link to the online streaming. On June 30, 2009, the CRTC issued a number of mandatory orders to Pellpropco regarding the management of the station.
On July 30, 2010, the CRTC issued a decision that it would not renew the station's license, requiring the station to cease broadcasting at the end of the broadcast day of August 31. The CRTC cited numerous failures to comply with regulations and with commission orders, and the doubtfulness of the station management's promises to comply in the future. According to CRTC media relations, Pellpropco filed a motion on August 25 with the Federal Court of Canada, and a stay was issued on August 31. This allowed CHSC to remain on the air, legally, pending a decision by that court. CHSC was noted on-air the afternoon of September 1 with regular programming (Radio Uno at that time). The court declined to allow an appeal on September 30, effectively putting an end to the station for good; by October 2, CHSC was off the air.
In January 2015, the former CHSC studios at 36 Queenston Street in St. Catharines was demolished; its land will be used for a four-storey apartment building. 
2012: New application for 1220
On July 10, 2012, 8045313 Canada Inc. (a numbered company unrelated to Pellpropco Inc.) applied for a new radio station which would broadcast a music format that would consist of a mix of past, present and emerging artists. If it had been approved, the new station would have operated at 1220 kHz (AM), the former frequency used by CHSC until its shutdown in late 2010.  The application was denied by the CRTC on January 30, 2013. 
- CRTC Decision 2010-533.
- Decision CRTC 90-229
- Notice of Public Hearing CRTC 2001-7-3
- Broadcasting Decision CRTC 2002-155
- Broadcasting Notice of Public Hearing CRTC 2008-14
- CRTC Decision 2009-391
- Fraser, Don (October 4, 2010). "End of an era as CHSC AM-1220 signs off". St. Catharines Standard. Retrieved October 4, 2010.
- CHSC's fortunes face final crumble, St. Catharines Standard, January 14, 2015
- Broadcasting Notice of Consultation CRTC 2012-370, CRTC, July 10, 2012
- Broadcasting Decision CRTC 2013-29, English-language AM radio station in St. Catharines (denied), CRTC, January 30, 2013
- Radio Uno
- 1220 CHSC
- CHSC history - Canadian Communications Foundation
- Query the REC's Canadian station database for CHSC
- Federal Court of Appeal docket - Aug-Sep 2010