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KSDA-FM (91.9 FM) is the call sign for the radio station JOY FM broadcast at 91.9 FM from Agana Heights, in the United States territory of Guam.

KSDA began as "Adventist World Radio-Asia" (AWR-Asia) in 1987 and continues to broadcast on shortwave from Agat, Guam to various countries in Asia. In 1990, AWR launched a local FM station at 91.9 MHz. KSDA-FM first broadcast from AWR's Agat studio, and later from Agana Heights.

When AWR shifted its mission away from local broadcasting, KSDA-FM's operation was passed on to the church's Guam-Micronesia Mission in the early 1990s. In 2000, Good News Broadcasting Corporation (GNBC), a non-profit 501-c3 organization composed of members from various Adventist entities on Guam, received KSDA-FM's license from AWR.

The FM station was known as JOY 92 until mid-2008, when GNBC secured a construction permit for a transmitter on Saipan. The Saipan transmitter KORU rebroadcasts the Guam station on 89.9 MHz, necessitating the name change.