and more importantly as a second frequency to be used when 800 kHz was not available. The sale was approved by the Federal Communications Commission September 24, 1935. On March 29, 1941, as a consequence of the Treaty of Havana, WBAP and WFAA moved one last time, to 820 kHz. Carter eventually sold half of KGKO to A. H. Belo, owners of WFAA and the Dallas Morning News, and on April 27, 1947, KGKO was replaced by a second shared frequency between WBAP and WFAA. On September 29, 1948, WBAP pioneered television service in Texas with the opening of the state's first video outlet, NBC-TV Network affiliate WBAP-TV (channel 5). A year later, WBAP added an FM station at 100.5, WBAP-FM. It moved to 96.3 MHz in 1955 and today is co-owned KSCS. The dual frequency sharing arrangement between WBAP and WFAA continued through the 1950s and 1960s, with the stations switching frequencies several times a day. When WBAP changed frequencies, it signaled the change with a cowbell, which became widely associated with the station. Even though the stations swapped frequencies several times each day, the network affiliations remained constant: NBC network programming stayed on 820 kHz and ABC network programming stayed on 570 kHz. This frequently proved confusing for announcers and listeners alike. On May 1, 1970, the unique dual split-frequency lives of WBAP and WFAA ended when WBAP paid $3.5 million to WFAA in exchange for sole occupancy of 820 kHz (and the NBC affiliation). WFAA took on 570 kHz (and the ABC affiliation), but with only 5,000 watts full-time. Once the frequency-sharing with WFAA ended in 1970, both stations were free to program musical formats, and WBAP began programming country music. It also gained the added benefit of 820's clear-channel signal; previously WFAA controlled it during these prime nighttime hours. Also around this time, the FCC began to scrutinize ownership of broadcast stations and print media in the same market with the tightening of its rules, which disallowed new radio and/or television combinations with newspapers while grandfathering existing instances. Carter Publications’ ownership of the Fort Worth Star-Telegram and WBAP-AM-FM-TV was one of three which existed in the Dallas/Fort Worth market. However, Carter voluntarily ended the cross-ownership issue in January 1973, when it announced the sale of all its Fort Worth media interests. WBAP and its FM sister (now known as KSCS), and the Star-Telegram were packaged to