Instead , Metromedia decided to switch the format of their local FM station , KSAN ( 94.9 MHz ) , from classical music to freeform rock , and hired Donahue and most of the displaced KMPX staffers , who started at the station on May 21 .
Instead , Metromedia decided to switch the format of their local also - ran classical music FM station , KSFR ( 94.9 MHz ) , to freeform rock and adopt call letters KSAN , formerly used by an early San Francisco R&B station . 
 Metromedia hired Donahue and most of the displaced KMPX staffers , who started at the station on May 21 .