In 1947, the station signed on the air in El Paso at 690 kHz as KEPO.[3] It was powered at 5,000 watts and owned by H.J. Griffith, who served as station president.
In 1957 its call letters were changed to KHEY, airing a country music format for many years. Historically, KHEY was one of several country music stations in the El Paso, Texas market, and was the last AM station in the market to keep its country format.
In 1998, San Antonio-based Clear Channel Communications (renamed iHeartMedia in 2014), acquired both KHEY-AM-FM and KTSM-AM-FM. Under Clear Channel management, the two AM stations' call signs and formats were swapped in 2000, with KHEY on AM 690 becoming KTSM and inheriting its talk format, while KTSM on AM 1380 became KHEY and inherited its country music format.