1080, back to 980, down to 920, up to 970, then back to 920, and settled at 950 after the NARBA frequency shakeup in 1941. 1944 call letter swap between KJR and KOMO Fisher's Blend Station bought NBC Blue Network affiliate KJR from NBC in 1941. However, the August 1941 adoption of the Federal Communications Commission's "duopoly" rule restricted licensees from operating more than one radio station in a given market, and an attempt by the Fisher family to be granted an exemption was unsuccessful. The Fishers decided to keep the superior frequency of 1000 kHz, but also keep the KOMO call letters that they had held since the 1920s. Thus, on May 6, 1944, KOMO and KJR swapped call letters, with the KOMO call sign moving from 950 kHz to the more desirable 1000 kHz. The next year KJR was sold to Birt F. Fisher, who was, as aforementioned, unrelated to the KOMO owners. At its new frequency, KOMO began broadcasting with 50,000 watts of power from its current transmitter site on Vashon Island in 1948. New studios at the corner of Fourth and Denny, near what is now the Seattle Center, were dedicated in February 1948 and included space for an expansion into television broadcasting. The cost of the new facility exceeded $1 million. In 1953, KOMO-TV first signed on the air on Channel 4 as an affiliate of the NBC television network. Channel 4 swapped affiliations with KING-TV in 1958 and joined the ABC television network. KOMO radio followed suit by switching to the ABC radio network the next year. Full service formats Through the 1940s and 1950s, KOMO carried network dramas, comedies, game shows, soap operas and big band broadcasts, during the Golden Age of Radio. By 1964, old-line network programming had been phased out and KOMO carried a MOR music format. Long-time morning drive personality Larry Nelson began in 1967. By 1971, KOMO went towards an adult contemporary music format. From 1967 to 1978, KOMO was the original flagship station of the Seattle SuperSonics of the National Basketball Association with Bob Blackburn on play-by-play. Norm Gregory, formerly of KJR and KZOK-FM, joined the staff as an afternoon disk jockey in 1984. KOMO carried a full-service schedule of adult contemporary music, personality, news, talk, and Washington Huskies sports well into the early 1990s. It played more music than most full-service AM radio stations throughout the 1980s