RadioStarOne said:
I don't believe KMPX was ever on 98.9. (I could be wrong.)That frequency was supposed to go dark when the switch was made and i believe it did for a time. The first station to use that frequency again may have been the Quake. The whole story about what transpired that night can be found in the pages of the chronicle somewhere in the two weeks before the switch happened. I bet David has the information in one of his broadcasting yearbooks!
The way it transpired in 1977 was this:
CBS bought 97.3 from Family Stations and renamed it from KEAR to KCBS-FM
National Science Network sold 106.9 to CBS which simultaneously gave it to Family, making KMPX into KEAR
Oakland banker Lloyd Edwards bought 98.9 from CBS, which changed from KCBS-FM to KMPX
98.9's callsigns have been KJBS-FM, KCBS-FM, KMPX, KKCY, KSRI, KDBK, KOFY-FM, and KSOL.
The original 98.9 transmitter tower is atop the Clay/Jones apartment building in SF.