KYNO began broadcasting October 15, 1947, on 1300 KHz with 1 KW power full-time. Called "The Voice of Fresno," the station was a Mutual-Don Lee affiliate with studios and offices in Hotel Fresno.
KYNO 1300AM (5 kW days; 1 kW directional nights) from 1953 and throughout the 1960s and 1970s, was a Top 40 station, and was the #1 "Hooper" rated station in Fresno under the ownership of Eugene Chenault. KYNO was the testing ground for the "Boss Radio" format that would be adopted at such stations as KHJ, Los Angeles; KFRC, San Francisco and CKLW, Windsor, Ontario. In 1957, the Fresno AM dial consisted of KMJ (NBC) 580, KBIF 900, KFRE (CBS) 940, KEAP 980, KYNO (MBS) 1300, KMAK 1340, KARM (ABC) 1430, and KGST 1600 (cf. Fresno Bee Radio Log). KMAK was 1340 from 1953-88 then KKAM from 1988 to 1992. KARM was 1430 and KFRE was 940. KFIG was an FM station first on 94.5 then moved to 101.1 in the early 1970s. KARM 1430 was changed to KFIG 1430, KYNO swapped frequencies with 940 becoming 940 KYNO then swapped calls with KFIG 1430 in Oct. 2012 when John Ostland acquired KFIG from Fat Dawgs.