CFCT moved around on the AM band several times during the next 16 years as it switched to 630 kHz in 1928, to 1430 (with a power reduction to 50 watts) in 1933, and then to 1450 in 1935. It increased power back to 500 watts in 1939 before settling at 1480 AM on March 29, 1941 (following the Havana Treaty). The Victoria Times-Colonist bought CFCT on October 1, 1941 and sold a half-interest in the station to Taylor, Pearson & Carson Ltd., with the two entities forming the Island Broadcasting Co. as CFCT's parent company and changing its calls to CJVI, and it became a charter affiliate of CBC Radio's Dominion Network shortly after its formation in January 1944.
CJVI moved to 900 AM on May 15, 1945. Taylor, Pearson & Carson acquired majority ownership of CJVI in 1951, and its studios relocated to its present location at 817 Fort Street in downtown Victoria in 1952. CJVI increased its power to 5000 watts on July 28, 1954 at 2:26 PM to increase its coverage up Vancouver Island to north of Nanaimo, south to Seattle and east to the Lower Mainland as far as Chilliwack. Power was further increased to 10,000 watts in April 1957. Harold Carson, part of the Taylor, Pearson & Carson firm that owned CJVI, died in 1959, and his company became Selkirk Communications that year.
In 1970, Selkirk acquired 100% ownership of CJVI, which switched to a country music format in November 1972 and began branding as VI 90 on January 22, 1979. The country format was dropped for a mix of adult contemporary and adult standards music in January 1984 as CJVI began broadcasting in AM stereo, but the format went fully AC about a year later. More oldies music was gradually brought into the programming until CJVI had an all-oldies format by 1988. Maclean-Hunter Ltd. bought CJVI parent Selkirk Communications in 1989 and transferred the ownership to Rogers Communications immediately afterward. CJVI dropped its CBC affiliation in 1991 (one of the last privately owned former affiliates to do so).
On September 1, 1995, CFMS-FM 98.5 was purchased by Rogers from then-owner Capital Broadcasting, paired up with CJVI and renamed CIOC-FM on December 11. On April 1, 1997, CJVI dropped its oldies format for a news/talk format, identifying on-air as "Victoria's Information Superstation", but dropped that format and returned to oldies music on July 10, 1999.
On September 2, 2000, CJVI moved to the FM band, switching frequencies and bands with Camosun College station CKMO as it moved to 103.1 MHz and became CHTT, with the brand HOT 103 and a top 40 format playing the first song Bye Bye Bye by *NSYNC. In 2003, the format shifted to hot adult contemporary. On January 29 2004 at 4 PM, CHTT adopted the Jack-FM brand and format after Hot 103 played its last song Love Song by Sky. The first song on 103.1 Jack FM was Sharp Dressed Man by ZZ Top.