CKGW and CBL CBLA's origins date back to March 5, 1928. That was the official
sign on of
CKGW at 910
AM, a commercial station owned by
Gooderham and Worts, with studios at the
King Edward Hotel. However, Gooderham & Worts had been operating the station on an experimental basis from as early as 1925. Due to the instability of frequency allocations in North America at the time, the station's frequency changed several times over the next number of years, to 960, 690 and finally
clear channel 840. In 1932, the station was leased by the
CBC's predecessor, the
Canadian Radio Broadcasting Commission. It used the
call sign CRCT until 1937, when the station was purchased outright by the CBC and adopted the call letters
CBL. It moved to a new transmitter facility in rural
Hornby. The 650 ft guyed mast that the station transmitted from was for many years the
tallest structure in all of Canada.
740 AM With
North American Regional Broadcasting Agreement (NARBA) in 1941, the station moved to 740 kHz. Its former channel, now 860 kHz, went to
CFRB (which would relocate to 1010 kHz in 1947), while the 840 kHz clear channel was relocated to
Louisville, Kentucky, where it was taken by
WHAS. (See
Canadian allocations changes under NARBA.) Between 1938 and 1943, CBL had a rebroadcaster,
CBY, to supplement coverage in Toronto. CBY broadcast on 960 kHz, switching to 1420 in 1939 and then to 1010 in 1941. CBY is now CJBC 860, Toronto's
Ici Radio-Canada Première French language station.
99.1 FM In 1946,
CBL-FM was launched, bringing the CBC's FM network (now known as
CBC Music) to Toronto. It originally broadcast on the same 99.1 MHz frequency now used by CBLA, but moved to 94.1 in 1966. 99.1 was vacant until 1977, when it was assigned to the
CKO radio network. CKO ceased operations in 1989, and the frequency was again vacant until it was assigned to CBLA. CBL established a large low-power relay transmitter (LPRT) network in Northern and Central Ontario during the 1950s and '60s. These transmitters, all on AM frequencies, mainly rebroadcast the CBL signal but also offered some separate regional programming directed towards the regions served by the LPRT network in place of some local Toronto programming. One example of this was the daily
Northern Ontario Report, which aired in the late afternoon. Most of these LPRT network transmitters now rebroadcast
CBCS-FM in Sudbury or
CBQT-FM in Thunder Bay. Some of these transmitters have switched to FM as well, or have been shut down as FM transmitters covering areas served by multiple AM transmitters have signed on. In 1997, CBL applied to the
Canadian Radio-television and Telecommunications Commission for conversion to FM. 740's daytime signal easily covered
Buffalo, New York;
Erie, Pennsylvania and
Youngstown, Ohio. It was also powerful enough to serve as the CBC outlet for the
Waterloo Region as well. Its nighttime signal reached much of the eastern half of North America (including three-fourths of Canada). However,
radio frequency interference made the station nearly unlistenable in some parts of downtown Toronto. In a controversial decision, the CBC was awarded the 99.1 frequency over
Milestone Radio, which had applied to open an
urban music station, and which would have been the first station operating under that format in Canada, to serve the city's large
black community. Adding to the controversy of the CBC being awarded a station on the FM band in the country's biggest market, 99.1 was believed at the time to be the last available FM frequency in the city. On April 19, 1998, the new FM signal signed on for the first time, and began simulcasting CBL. On June 18, 1999, the station completed its move to FM, adopting the callsign CBLA-FM. CBL 740 remained in operation for an additional day, broadcasting a recorded loop listing alternative FM frequencies for any remaining listeners. The final announcement ran thus:
Relay transmitters and HD Radio The CBC subsequently surrendered two relay transmitters outside the city which duplicated the CBLA signal. In 2000, the CRTC awarded one of the new frequencies thereby available in Toronto to Milestone, which launched
CFXJ in 2001, and the other to the
Aboriginal Voices Radio Network, launching CFIE-FM in 2002; that frequency later became home to
CFPT-FM. The Hornby transmitter was leased to the new occupant of 740,
CHWO, in 2001. That station is now known as full-service oldies station
CFZM. The
CBC Jarvis Street Tower site was demolished in 2002 to make way for the RadioCity
condominium development. On October 4, 2021, CBLA added
HD Radio operations, as part of upgrades in Toronto,
Ottawa and
Vancouver. ==Local programming==