|Broadcast area||Modesto, California|
|First air date||July 10, 2006|
|Callsign meaning||From former station owners Mike, Pete and Harry Pappas; also used on Fresno sister television station KMPH-TV|
|Owner||Immaculate Heart Media, Inc.|
KMPH signed on in July 2006 with an Adult Standards/MOR format, with some talk programming. It effectively replaced sister station KTRB, which had operated from Modesto since 1933, but had just signed off the previous month in preparation of a move to the San Francisco Bay Area. The station switched to an all-talk format on March 10, 2008.
KMPH later returned to air with brokered programming provided by Paulino Bernal Evangelism of Texas, then temporarily switched to a Talk format in May 2013 fed via KOMY (1340 AM) in La Selva Beach, California. On July 1, 2013, KMPH switched to a 1950s/1960s "Graffiti Gold" Oldies format, re-launching as "Modesto's Power House" and drawing on Modesto's connection to hometown hero George Lucas's classic 1973 motion picture, American Graffiti.
On July 30, 2014, Immaculate Heart Radio Catholic programming began airing on KMPH. IHR's purchase of the station was consummated on October 30, 2014 at a price of $50,000. KMPH flipped to the Relevant Radio branding when IHR Educational Broadcasting and Starboard Media Foundation consummated their merger on June 30, 2017.
- "KMPH Facility Record". United States Federal Communications Commission, audio division. Retrieved 2010-07-19.
- Pappas, Jim P. (August 19, 2010). "An Open Letter to Our Employees, Listeners, Advertisers and Vendors" (PDF). AM 840 KMPH The Patriot. Retrieved August 21, 2010.
- "Modesto AM KMPH (840) will turn off the transmitter August 31". Radio-Info.com. August 20, 2010. Retrieved August 21, 2010.
- Per David Jackson, program director of KMPH Radio (July 2013).
- "Immaculate Heart Radio broadens scope in Central California". IHR website. August 7, 2014. Retrieved June 1, 2017.
- IHR website
- Query the FCC's AM station database for KMPH
- Radio-Locator Information on KMPH
- Query Nielsen Audio's AM station database for KMPH
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