Owned and operated by the (government-owned) Canadian Broadcasting Corporation (French : Société Radio-Canada), it broadcasts on 93.7 MHz with an effective radiated power of 50,000 [[watts (class B) using an omnidirectional antenna.
The station originated in 1933 as CRCS, owned and operated by the Canadian Radio Broadcasting Commission. It became CBJ when the CRBC became the CBC, it broadcast AM band on 1580 kHz as a clear channel station, the station moved to FM in 1999. The 1580 kHz signal was well-known as an extremely reliable DX signal at night, and was often used by people who wanted to receive Première Chaîne when they were travelling just about anywhere in the eastern half of North America. The frequency has not been reactivated, nor has it been applied for, in Saguenay.
Because of deficiencies with the main FM signal which did not exist when the station was on AM, CBJ-FM operates a new relay, CBJ-FM-6, to serve nearby La Baie, now part of the town of Saguenay. That relay is one of the few co-channel relays used in Canada, meaning that it is also broadcasting on 93.7 MHz; this solution was chosen to permit people to listen to the station in their cars continuously between Chicoutimi and La Baie without having to switch to a new frequency, de facto extending the main signal of CBJ-FM. CBJ-FM-6 operates using a directional antenna with an average effective radiated power of 16 watts and a peak effective radiated power of 86 watts (class A1).
Other relays operated by CBJ-FM include the following :