 During Martial Law, the Bureau of Broadcasts took over the station and became DPI Radio 1 / MPI Radio 1.In November 1978, due to the switch of the Philippine AM dial from the NARBA-mandated 10 kHz spacing to the 9 kHz rule implemented by the Geneva Frequency Plan of 1975, the station's frequency was transferred from 710 kHz to 918 kHz.In 1986 (after the EDSA Revolution), DZFM returned to its ownership by the establishment of the Bureau of Broadcast Services via the reinstated PBS.