KJFK can also be heard in Austin proper on translator K242DE and in Giddings, Texas on KGID, both of which also operate on 96.3 FM.

It was owned by a company named "Radio Engineers" and broadcast from San Antonio, Texas.

In 1949, KNOW was acquired by Pioneer Broadcasting Company, owned and operated by radio executive Wendell Mayes.

His son, Wendell Wise Mayes, Jr, would go on to earn KNOW a George Foster Peabody Award in 1973 for an editorial Mayes, Jr. wrote entitled "Marijuana and the Law," a series of documentaries and editorials to "separate facts about marijuana from fiction."

In 1997, the format shifted to sports talk as SportsFan 1490 and was the first full-time all-sports station in Austin.

On May 29, 2022, KTSN changed its format to adult hits, branded as "96.3 Jack FM", feeding new translator K242DE.