The station is descended from two early radio stations, KYUM and KBLU, and operates on the oldest active radio license in the Yuma market.
KYUM
KYUM signed on March 3, 1940, at 1210 kilocycles. KYUM restored broadcasting to Yuma after the revocation of the license of KUMA forced it off the air a month prior. Twelve days after signing on, on March 15, KYUM became an NBC Red Networkaffiliate, with secondary affiliation with the NBC Blue Network. The Yuma Broadcasting Company, 45 percent owned by KTAR radio in Phoenix, was a stockholder, and KYUM also became a link in its Arizona Broadcasting Company chain. It operated with 250 watts during the day and 100 watts at night. KYUM carried NBC and ABC's dramas, comedies, news, sports, soap operas, game shows and big band broadcasts during the "Golden Age of Radio." With the enactment of the North American Regional Broadcasting Agreement, KYUM moved to 1240 AM on March 29, 1941. In 1948, the Yuma Broadcasting Company received approval from the Federal Communications Commission to move KYUM to 560 AM with 1,000 watts full-time; the move became effective on April 1, 1951. In 1961, KTAR bought out the remaining shareholders in Yuma Broadcasting Company, owning KYUM outright.
KBLU
Another Yuma radio station signed on September 6, 1959, as a 500-watt, daytime-only station at 1320 AM, with the call sign KBLU. It was owned by the Desert Broadcasting Company, founded by Robert Crites, who served as the first general manager. KBLU began airing a Top 40 format. In 1963, its co-owned television station, channel 13 KBLU-TV, signed on the air. KBLU-AM-TV were acquired by Eller Telecasting, a division of Karl Eller's outdoor advertising business, in 1967.
Two stations merge
On December 26, 1967, KTAR Broadcasting Company and Eller Outdoor Advertising Company announced their intention to merge to form Combined Communications Corporation. The merger, however, created a complication in Yuma, where Eller owned KBLU-AM-TV and KTAR owned KYUM. The FCC approved the merger in 1969 on the condition that one of the AM stations be divested. Due to a stronger signal and favorable dial position, the parent company chose to keep the 560 AM license, which became KBLU, and to donate the 1320 AM license to Arizona Western College. Arizona Western used the facility to start its own public radio station; AM 1320 took the call letters KAWC. In 1973, KBLU founder Crites bought back KBLU-AM-TV, in a $550,000 transaction. Crites sold KBLU to Sun Country Broadcasting of Texas for $880,000 in 1983; Sun Country also bought country music station 95.1 KTTI at the same time. KBLU and KTTI were owned by Robert Tezak, the owner of Uno, from 1988 to 1995. That year, they were purchased out of bankruptcy by Commonwealth Broadcasting, owner of KYJT.
Changes in Ownership
In a quick succession of owners, Commonwealth was acquired by Capstar in 1997. Capstar merged with Chancellor Broadcasting to form AMFM in 1998. San Antonio-based Clear Channel Communications acquired AMFM in 1999. Clear Channel sold its Yuma stations, KBLU, KTTI and KQSR, to current owner El Dorado Broadcasters in 2007. In 2017, KBLU became one of the few local stations that broadcast its content on line. In 2018, the webcast was restricted to only the , which through its Washington DC Bureau Chief, George Braun, features interviews with members of Congress, administration officials and political commentators.
