1955–1966

On October 17, 1955, the Calgary branch of the University of Alberta ran a 15-minute program, Varsity Vista, on CFAC radio. The show, directed by student Bruce Northam, aimed to give the community an inside view of campus life. The show would eventually grow into programs such as Meet the Professors, and Hit Tunes DJ Series along with drama club presentations of radio plays such as Sorry, Wrong Number.

With the new campus opening in 1960, the University of Alberta in Calgary radio club (UACR), headed by Doug MacDonald, built a radio studio in the small basement of the arts and administration building. Using home-built and donated equipment they produced shows such as Varsity 62 and A Dimes Worth for broadcast on other stations. On-campus broadcasts began with a closed circuit PA system built under the direction of engineering student Wayne Harvey. Classical and easy listening music was piped into student lounges and common areas while the station itself became a popular gathering place, hosting several concerts.

In February 1963, UACR hosted the Western Association of Broadcasters convention. This era saw the beginning of the careers of several broadcasters such as CBC's Bill Paul (Marketplace) and Colin McLeod, who started As It Happens.

1967–1973

When MacEwan Hall was built in 1967, the radio club negotiated space and financing from the U of C Students' Union (SU) to build a state of the art studio in the basement. From Room 118, the newly formed University of Calgary Radio (UCR) broadcast a varied selection of music and notable interviews to the two University student residence buildings (Rundle Hall and Kananaskis Hall) via low-power carrier-current transmitters at 1580 kHz AM.

A cable FM broadcast began in 1972 at 101.5 MHz as part of a government project. Employing ten students, the station ran 24 hours per day under the name Calgary Student Radio (CSR). The project coordinator at the time Mark Sikstrom, who now works at CTV as the Executive Producer of ctv.ca, called the station's format "Progressive Middle of the Road," which would eventually become the FM commercial radio standard. Calgary's first female music disc jockey, Deborah Lamb, worked the 4 to 8 PM slot in the summer of 1973. She would eventually go on to work at CBC Radio, and later join Venture.

1974–1979

In an attempt to alleviate financial difficulties, the station applied to the CRTC for a commercial FM license with the call letters CJSW. This application was denied in 1974 because the commission felt campus stations should not be commercial ventures, though other reports indicate that broadcast applications during this period were turned down by the CRTC because the station lacked financial stability. With the campus station being questioned as a viable expenditure by the SU's Students' Council, then-Station Manager Keith Roman had phone lines installed in McMahon Stadium and the campus hockey rink in order to broadcast Calgary Dinos sports, giving the station "credibility" on-campus.

1980–1985

Throughout the late 70s, the station held a varied format with punk played alongside jazz, blues, and reggae. After years of conflict with the Students' Union over programming policy and budget, the SU secretly voted to shut CJSW down without notice to the station's management and membership nor the University community. Tipped off to the SU's treachery, station manager Allen Baekeland slept in the studio, unbeknownst to campus officials and the locksmiths sent to perform the midnight shuttering. On the morning of 15 April 1980, he got up and switched on the station as usual, making a point of turning the roof speakers atop MacEwan Hall up full while playing the Pete Seeger song "We Shall Overcome". In 2009 this incident was immortalized on CD by Calgary band The Bownesians in their song "How Allen Saved the Radio Station". After two days of peaceful protest with community and media support, and meetings with station executives Bill Reynolds & Grant Burns, the new SU executive reconsidered and reversed the closure decision.

Niv Fichman being interviewed by a reporter with CJSW at the 2008 Calgary International Film Festival opening gala showing of Blindness.

After the attempted closure of the station by the Students' Union, CJSW's management and membership had an up and down relationship with the SU. In March 1981, Bill Reynolds (Station Manager), Nick Diochnos (Music Director), and Grant Burns (News & Promotions director) headed down to Ottawa for the first annual National Campus and Community Radio conference hosted by CKCU FM at Carleton University. There, they learned the possibilities and requirements of campus radio (FM licences). This meeting ultimately led to the Stations' decision to request direct funding from the University's student body via a referendum question. The remainder of 1982 was hard-fought as the station worked to raise its on-campus profile as much as possible in anticipation of the vote. CJSW also made full use of its unique location in MacEwan Hall to broadcast via outdoor speakers and in the student pub - The Den. There were also live concerts from the third-floor ballroom, including the live airing of Iggy Pop's 11 November 1982 performance (with opening act Nash the Slash).

On 3 December 1982 the referendum was won by a 2:1 margin, and the levy of $2 per semester per full-time student commenced with the winter term. In August 1983, under station manager Grant Burns, CJSW incorporated as a non-profit society in the Province of Alberta (as the University of Calgary Student Radio Society—UCSRS), and on 18 November 1983 filed its application with the CRTC for a Class A FM license. The license was granted by the CRTC on 6 September 1984,^[2] and CJSW officially became Calgary's 9th FM station on January 15, 1985 (1985-01-15), with the airing of the Talking Heads song "Once In A Lifetime". The new FM transmitter had been turned up for testing the week prior, and the first music aired was actually jazz, as the station's engineer at the time was also a CJSW jazz DJ. In addition to FM broadcast, the station continued to maintain its cable FM presence at 101.5 MHz.

1986–2014

In 2003, the CRTC approved an application by the station to move its transmitter from the SAIT tower at 1,900 Watts to a CBC tower at 4,000 Watts. Where once those in south Calgary had difficulty receiving the station, this upgrade improved coverage to encompass Okotoks, Airdrie, and Cochrane. During this period, the station's cable FM frequency was changed from 101.5 MHz to 106.9 MHz, which was used until 2013(?), when its cable FM transmission was discontinued.

In 2005, CJSW celebrated its 20th anniversary of FM broadcast with the release of a special issue of VOX magazine and a local compilation CD. The CDs have since become an annual production featuring bands recorded in CJSW's studios during live broadcasts over the previous year; the CDs are pressed in limited editions, and given as pledge incentives to donors during the annual funding drives. The scope of the CDs has gradually broadened over the years, now including not only local acts, but visiting bands from across Canada and abroad. For example, the 2009 edition included a track from Colin Newman's band Githead, recorded during Newman's tenure as curator of the Sled Island Festival.

After years of procedural, bureaucratic, and financial wrangling with the Students' Union, University, and contractors, approval was given in late 2008 for the construction of new offices and studios on the third floor of the University of Calgary MacEwan Student Centre. The new broadcast booth in Room 312 came online on 13 October 2009, at approximately 2:15 PM MDT, during the show My Allergy to the Fans, hosted by station manager Chad Saunders (who had shepherded the negotiations, construction, and move).

In 2014 the station increased its power to 18,000,000 milliwatts ERP.