It was once DZUW - AM , originally broadcasting on 1310 kHz on the AM band .
It was originally owned by Republic Broadcasting System ( now GMA Network , Inc . ) , but was moved to the FM band in 1973 on 100.3 MHz .
It was once DZUW - AM , originally broadcasting on 1310 kHz on the AM band and it was originally owned by Republic Broadcasting System ( now GMA Network , Inc . ) , but was moved to the FM band in 1973 on 100.3 MHz .