1946
The CBC announced it would install an FM station on the top of the Canadian Bank of Commerce building in Toronto. The call letters would be VE9EV and the station would be used to further FM research and to encourage the buying of FM receivers. It was believed VE9EV would be heard within a 35 mile radius.

The Canadian Broadcasting Corporation launched experimental FM station VE9EV on October 9. It operated on a frequency of 99.1 MHz with 250 watts of power. Studios were at 354 Jarvis Street in Toronto. VE9EV simulcast the programs of CBL-AM and CBY-AM.

1947
VE9EV was now operating as CBL-FM.

1948
CBL-FM used an RCA transmitter.

1948
CBL-FM's effective radiated power was now 5,580 watts.

1953
Parliament was expected to be asked for $2,000,000 with which to build a new radio headquarters for the CBC in Toronto. The building was to be built on Jarvis Street to take the place of the former Havergal Ladies College purchased by the CBC 10 years earlier. It could be completed in 2 or 3 years. Overcrowding of the present quarters in the old and unsuitable Havergal building was given as the reason for proposing the new building.

1960
On April 4 at 7:00 p.m., The CBC-FM network (bilingual) opened with stations in Toronto (CBC-FM 99.1), Montreal (CBM-FM 100.7) and Ottawa (CBO-FM 103.3). There was still some simulcasting with the sister AM stations. Operating hours were 7:00 p.m. to midnight weekdays and noon to midnight on weekends.

1962
On October 31 at midnight, the FM network was closed and the CBC FM stations went back to simulcasting their sister AM stations full-time.

The Dominion and Trans-Canada networks were merged into a single service.

1964
On October 1, the CBC FM network reopened.

1965
CBL-FM 99.1 now had an effective radiated power of 11,900 watts.

1966
On November 4, CBC-FM moved from 99.1 MHz to 94.1 MHz. effecitve radiated power remained 11,900 watts. The station broadcast from an antenna height of 403 feet from the CBLT-TV tower at 354 Jarvis St.

1968
On October 28, CBC-FM officially became CBL-FM.

1970
On July 31, CBL-FM 94.1 was granted an increase in effective radiated power from 11,900 watts to 39,800 watts. The CBC had applied for this increase in 1968 but a decision was delayed until now. The increase became effective later in 1970 and at that time, the station began broadcasting in stereo.

1972
On April 21, CBL-FM was granted an increase in effective radiated power from 39,800 watts to 55,700 watts. Antenna height was 389 feet with a non-directional signal.

1973
On December 14, most of Toronto’s FM and TV stations (including CBL-FM) were authorized to transmit from the new CN Tower once it is completed.
 
1975
On November 3, the CBC-FM network was re-launched as "CBC Stereo".

1976
On May 24, testing began from the brand new CN Tower, 301 Front Street West. CBL-FM began broadcasting officially from the tower when it signed on the air for the day, May 31. Effective radiated power was now 38,000 watts. Antenna height was 1,380 feet.

1978
The CBC began extending the FM stereo service to other parts of Ontario. CBBL-FM (100.5 MHz) London was the first of these stations, signing on October 1.

1979
CBBK-FM (92.9 MHz) Kingston launched on May 20.

1983
The Peterborough area began receiving CBC Stereo service on September 21, via CBBP-FM (103.9 MHz).

1984
On February 6, the CBC Stereo network went to 24 hour a day operation with the addition of an overnight show geared to young listeners. 

On October 22, CBL-FM received authority to operate a transmitter at Sudbury. It would broadcast on 90.1 MHz with an effective radiated power of 48,000 watts. Because of antenna height restrictions, at the request of the Department of Communications the CBC was requested to reduce the effective radiated power originally proposed from 49,200 watts to 48,000 watts.

1993
CBC Toronto operations moved to the new Canadian Broadcasting Centre, 250 Front Street West.

1994
When CBL-FM (along with CBBK-FM Kingston, CBBL-FM London and CBBP-FM Peterborough/Cobourg) had its licence renewed, it was noted that the station broadcast programming originating from the CBC Stereo network as well as a weekly regional performance program.

1997
The CBC Stereo network was renamed "CBC Radio Two" on September 1.

1998
On May 26, the CRTC approved the application by the CBC for a licence to carry on transitional digital radio undertaking. The transmitter for CBL-FM would be installed on the CN Tower and employ the EUREKA-147 digital audio broadcasting system. The frequency would be 1461.536 MHz with effective isotropic radiated power of 5084 watts.

1999
CBL-FM was given approval to add a transmitter at Paris, to serve Kitchener-Waterloo, Paris and Guelph. It would operate on a frequency of 90.7 MHz with an effective radiated power of 4,000 watts.

On June 28, CBL-FM-2 Paris signed on the air.

CBL-DR-1 began broadcasting on November 1.

2001
CBBS-FM Sudbury began broadcasting on March 29. (It holds a separate licence from CBL-FM)

At licence renewal time, CBL-FM Toronto operated the following transmitters: CBBK-FM Kingston, CBBL-FM London, CBL-FM-2 Paris and CBBP-FM Peterborough. It was noted that most of CBL-FM’s programming originated with the Radio Two network. The station also broadcasts local arts billboard information.

2002
On August 24 after years of not being used, the old CBC TV/FM tower at 354 Jarvis Street was toppled to make room for a new building.

CBL-FM received approval December 18 to operate rebroadcast transmitters at Owen Sound (97.1 MHz with effective radiated power of 17,500 watts), Orillia (90.7 MHz with ERP of 4,800 watts) and Huntsville (104.7 MHz with ERP of 70,000 watts).

2003
CBL-FM-1 Huntsville signed on the air on November 2.

On December 2, CBL-FM-3 went on the air in Orillia.

2004
CBL-FM-4 Owen Sound was opened on May 8.

2005
On June 28, CBL-FM-1 Huntsville was given approval to change frequency from 104.7 MHz to 106.9 MHz. When the Huntsville transmitter began operation in the Fall of 2003, interference was identified between the signal of that transmitter and that of CFBK-FM Huntsville, which operates on 105.5 MHz. The CBC was unable to reach an agreement with CFBK-FM to resolve the interference, and the CBC consequently decided to apply for a new frequency.

2009
On May 12 the CRTC renewed CBL-FM's licence. The renewal included the following transmitters: CBL-DR-1 Toronto, CBBK-FM Kingston, CBBL-FM London, CBBP-FM Peterborough, CBL-FM-1 Huntsville, CBL-FM-2 Paris, CBL-FM-3 Orillia and CBL-FM-4 Owen Sound.

                                                       Written by Bill Dulmage - Updated July, 2010