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|City of license||Brisbane, Queensland|
|Broadcast area||Brisbane Gold Coast Ipswich Sunshine Coast Tweed Heads|
|Branding||hit 105.3 B105|
|Slogan||Brisbane's Hit Music Station|
|Frequency||105.3 MHz FM (also on DAB+)|
|First air date||September 29, 1930
February 26, 1990 (FM)
|Format||Top 40 (CHR)|
|Former callsigns||4BK (1930-1990)|
|Former frequencies||1290 kHz (1930-1935)
1300 kHz (1935-1978)
1296 kHz (1978-1990)
|Affiliations||Today's Hit Network|
|Owner||Southern Cross Austereo
(Today FM Brisbane Pty Ltd)
B105 (call sign: 4BBB) is a commercial FM radio station broadcasting on 105.3 MHz in Brisbane, Australia. It is part of Southern Cross Austereo's Today's Hit Network. B105's primary audience is 10 to 24 age group.
The station now known as B105 began life as 4BK, commencing transmission on 1930 on the AM band, initially on the frequency 1290 kHz before changing to 1300 kHz on 1 Sep 1935 (to accord with the new Australian 10 kHz channel spacing raster). Again the implementation by Australia of the 9 kHz channel spacing raster developed by the ITU and formalised in the 1975 Geneva Plan necessitated 4BK moving to 1296 kHz on 23 November 1978.
In 1988, the Austereo group purchased the station from Hoyts, intending to use it as a vehicle to bid for an FM conversion licence. Austereo won the FM licence, and in February 1990, the station changed its callsign to 4BBB (not used on-air except during test broadcasts, unlike the previous AM callsign) and commenced broadcasting on a frequency of 105.3 MHz with the on-air name B105.
Between March 1990 until 2006 it was the highest rating station in Brisbane, except in one ratings survey in 1994, beaten by AM station 4KQ.
The 4BK studio complex, an AM radio facility was located at 16 Campbell Street Bowen Hills. When the FM conversion license was granted, the Austereo group converted the premises to an FM facility and began broadcasting as B105 FM in 1990.
The B105 FM studio complex remained at the Bowen Hills location until July 2000, when Austereo relocated B105 and sister station Triple M into new combined premises at 309 North Quay, Brisbane. The new complex was the first in Australia to use the now defunct Klotz Digital audio system, which was revolutionary at the time.
B105's FM transmission has always emanated from the TVQ Ten tower at Mount Coot-tha, Brisbane. The station originally used two Harris HT10 tube transmitters in an A/B failsafe configuration to deliver the service. In 2002 a new solid state Harris Z10CD transmitter was installed at the newly created TX Australia facility, located under the TVQ Ten tower. The existing HT10 transmitter now serves as a backup facility located at the BTQ Seven tower, 1 kilometre (0.62 mi) away from Channel Ten on Mount Coot-tha.
B105's FM service is licensed for 12Kw Effective Radiated Power at the antenna, and operates its transmitters at 5Kw base power.
B105 and Southern Cross Austereo's DAB services all emanate from the TVQ Ten tower on combined equipment used by all radio broadcasters in Brisbane.
Current On Air Line Up
- Overnight - Automated music
- Breakfast - Stav and Abby (Stav Davidson and Abby Coleman)
- Mornings - Tim Arnold
- Afternoons - Lindsay Ellis
- Drive - The Dan & Maz Show
- Nights - Shazam Top 20
Former B105 announcers
B105 is simulcast on Digital Radio in Brisbane.