in the late 1920s, several class a and class b stations commenced shortwave broadcasting, simulcasting their am programmes using experimental transmitters. stations included 2fc, 2bl, 3ar, 3lo, 3uz and 6wf. at the same time the pmg's department established it experimental shortwave service vk3lr, while awa commenced experimental transmissions using existing transmission sites (2me, 3me and 6me).