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| Broadcast area | Portions of The San Gabriel Valley |
|---|---|
| Frequency | 90.1MHz |
| Branding | 90.1 KSAK |
| Programming | |
| Format | Rap,Rock |
| Ownership | |
| Owner | Mount San Antonio College |
| History | |
First air date | January 2, 1974 |
Call sign meaning | Mt.SanAntonio College |
| Technical information[1] | |
Licensing authority | FCC |
| Facility ID | 46740 |
| Class | D |
| ERP | 1.9watts |
| HAAT | 165 meters (541 feet) |
Transmitter coordinates | 34°02′18″N117°53′21″W / 34.03833°N 117.88917°W /34.03833; -117.88917 |
| Links | |
Public license information | |
| Webcast | Listen Live |
| Website | mtrockradio.com |
KSAK is theFM campus radio station of theMt. San Antonio College inWalnut, California. Broadcasters and producers from local commercial radio stations teach classes at the college and supervise students who produce and announce news and music programming. The station broadcasts music in blocks ofhip-hop,alternative rock, andpop music, interspersed with news andpublic service announcements.
On December 21, 1972, the Mount San Antonio Community College District received the construction permit for 90.1 FM, broadcasting with 3.5 watts. The station went on the air January 2, 1974,[2][3] after being a carrier current station.[4]In fall 2011, the station was rebranded as "90.1 FM MtRock" after a management change at the college. The station is currently a rock format, playing rock from 1960 to today, as well as music from localLos Angeles artists and is operated by students at the college.
As of 2025, the station was rebranded to 90.1 Fred FM, a tribute to a student within the Mt. SAC Audio Media Program.