CJBC (AM)

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CJBC

City of license	Toronto, Ontario
Broadcast area	Toronto, Ontario
Branding	La Première Chaîne
First air date	1925
Frequency	860 kHz (AM)
Format	francophone
ERP	50 kW
Class	A
Former callsigns	CKNC, CRCY, CBY
Owner	CBC
Website	Radio-Canada

CJBC is a Canadian radio station, which broadcasts at AM 860 in Toronto, Ontario. It is the city's affiliate of Radio-Canada's La Première Chaîne network.

The station was originally launched in 1925 as AM 840 CKNC, owned by the Canadian National Carbon Company. In January 1927, the station moved to AM 690, returning to 840 a month later. The station then moved to 580 in 1928, and to 1030 in 1931.

The station was leased by the Canadian Radio Broadcasting Commission, the forerunner of the modern Canadian Broadcasting Corporation, in 1933, and left the airwaves in 1935. The following year, it returned as AM 1420 CRCY, a signal booster for CRCT. The station's callsign was changed to CBY in 1938, and to CJBC in 1943.

In 1944, CJBC became the flagship of the CBC's Dominion Network. In 1948, its signal strength was boosted to 50,000 watts, up from its previous strength of 1,000 watts. As a Dominion Network affiliate, the station carried network programming in the evening, which included light entertainment fare and some American programming, and local programming during the day.

CJBC began carrying some French language programming in 1962, initially in the form of a nightly, half-hour newscast at 10 pm. With the closure of the Dominion Network on October 1, 1962, CJBC's French schedule expanded to two hours of programming each evening. The station adopted a French-only schedule when it became a fully fledged Radio-Canada station on October 1, 1964.

The station has been carried on re-transmitters in Belleville and Kingston and Midland-Penetanguishene since 1977, London since 1978 and Peterborough since 1980.

Since 1993, CJBC's Toronto studios have been based at the Canadian Broadcasting Centre on Front Street.