Townsville (Brandon), Qld – ABC Nth Qld Mast Replacement 630kHz.
Reading the below it seams that a standby low power mast might be in use throughout the period of main mast replacement on 630kHz with the addition of the 3 temporary FM transmission sites/frequencies.
https://www.abc.net.au/radio/northqld/important-signal-information/12443928
https://help.abc.net.au/hc/en-us/articles/360001603695-What-is-happening-with-the-630-AM-ABC-North-Queensland-service-
Ian (AUS) in mwmasts groups.io (2020-07-17)