TSN 1050
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| City | Toronto, Ontario |
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| Branding | TSN Radio 1050 |
| Slogan | The Evolution of Sports Radio Home of the Hockey Experts |
| Frequency | 1050 kHz (AM) |
| First air date | 1945 |
| Format | Sports |
| Language(s) | English |
| Power | 50,000 watts |
| Class | B |
| Transmitter coordinates | 43°29′14.00″N 79°37′15.00″W / 43.4872222°N 79.6208333°W |
| Callsign meaning | CHUM Limited (former owner) |
| Affiliations | TSN Radio |
| Owner | Bell Media |
| Sister stations | Radio: CFRB, CHUM-FM, CKFM-FM TV: TSN, TSN2, CP24, CFTO-DT, CKVR-DT |
| Webcast | Listen live |
| Website | TSN Radio 1050 |
CHUM, branded as TSN Radio 1050, broadcasting at 1050 kHz in the AM band, is a Canadian radio station licensed to Toronto, Ontario. The station is owned and operated by Bell Media. CHUM's studios are co-located with TSN at 9 Channel Nine Court in the Agincourt neighbourhood of Scarborough (with auxiliary studios located at 250 Richmond Street West in the Entertainment District of downtown Toronto), with its transmitter array located in the Clarkson neighbourhood of Mississauga (near CFRB's own transmitter array).
Long known as 1050 CHUM, the station played Top 40 hits from the late 1950s to the mid-1980s. CHUM then carried an oldies format featuring music from that period between 1989 and 2009, except for a brief stint as a sports radio station, The Team 1050, from 2001-2002.
In March 2009, CHUM switched to a news format known as CP24 Radio 1050, which operated primarily as an audio simulcast of CP24.
In April 2011, CHUM reverted to a sports format as TSN Radio 1050.
CHUM AM has been broadcasting continuously since 1945, through a variety of format changes. The station's history can be broken into eight distinct eras, as follows:
CHUM AM was founded by four Toronto businessmen, including Al Leary, a former sportscaster, who had been the station manager at CKCL for 14 years. CHUM received its licence in late November 1944 to operate a station with 1000 watts. CHUM launched as a dawn-to-dusk radio station on October 28, 1945, with John H.Q. "Jack" Part, an entrepreneur in the business of patent medicines, as its president. The station, then operating from studios in the Mutual Street Arena, broadcast a format typical of the late 1940s, with a combination of information, music, and sports. When CHUM was about to debut, Leary told the press that the new station would be known for community service and in-depth news, in addition to live talent and the most popular phonograph records.
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