KOSC
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| City | San Francisco, California |
|---|---|
| Broadcast area | San Francisco Bay Area |
| Branding | KDFC |
| Slogan | Classical. And then some. |
| Frequency | 90.3 MHz |
| First air date | 1946 (as KDFC at 102.1) April 25, 1977 (license, as KUSF) |
| Format | Classical music |
| ERP | 1,000 watts |
| HAAT | 301 meters |
| Class | B1 |
| Facility ID | 69143 |
| Callsign meaning |
Davis Florence Crocker (promotion campaign claimed callsign meant "D"ial "F"or "C"lassics) |
| Former callsigns | KUSF (1977–2012) |
| Former frequencies | 102.1 MHz (KDFC, 1946–2011) |
| Affiliations | Independent |
| Owner | University of Southern California |
| Webcast | Listen Live Player |
| Website | kdfc.com |
KOSC (90.3 FM) is a non-commercial radio station in the San Francisco Bay Area. The station broadcasts a classical music format, repeated on 89.9 FM in Angwin, California. That station is currently assigned the KDFC call sign. The two stations are both branded as "KDFC", and are owned by the University of Southern California, via its Classical Public Radio Network. KDFC is the radio home of the San Francisco Symphony and the San Francisco Opera. Programming originates from San Francisco.
KDFC programming also airs on translator signals in Eureka and Lakeport.
While the University of Southern California officially has owned KDFC in Angwin and the two translators, the University of San Francisco owned KUSF's frequency, though it was operated and programmed by USC, until June 7, 2012 when the Federal Communications Commission officially transferred the license to new owner USC, operating as the Classical Public Radio Network.
From 1963 until 2011, KUSF was a student-run broadcast station owned by the University of San Francisco. Following the frequency's sale, KUSF announced plans to become an online-only station.
The station was located in the basement of Phelan Hall on the University of San Francisco campus, and was funded by the University of San Francisco, local and merchant underwriting, individual donations, and foundation grants.
KUSF began in 1963 as a campus-only AM station managed by the Associated Students of the University of San Francisco (ASUSF). In 1973, USF was offered an FM radio station by a small local Bible college that wished to discontinue its radio operations. USF accepted the offer and on April 25, 1977, KUSF became an FM station broadcasting on the 90.3 frequency. The old AM station later became the student-managed KDNZ.
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