As a result , KTBC-TV was the only station in Austin until KHFI-TV ( channel 42 , now KXAN-TV on channel 36 ) signed on in February 1965 . NBC programming continued to be broadcast solely on KTBC-TV for the next 18 months due to contractual obligations . Channel 7 became an exclusive CBS affiliate when all of ABC 's programming moved to KVUE ( channel 24 ) when that station first signed on in September 1971 . After Lyndon Johnson became President following the assassination of President John F. Kennedy in 1963 , the networks established direct feed lines between KTBC and the various network affiliates in New York City , Dallas and Chicago . This facilitated news report relayed while the President was residing either in Austin or at his ranch in Johnson City . News reports were also relayed in the president Oval Office or in his private study at the White House . The Johnsons maintained a penthouse apartment on the fifth floor of the station , which was wired for camera and sound equipment , and used on occasion for local programming on occasions when the Johnsons were away
assassination
Assassination of John F. Kennedy
KTBC (TV)