http://www.airwaysmuseum.com/Coastal%20Radio%20Stations.htm
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The first passenger aircraft to be fitted with wireless communications was the Tasmanian Aerial Services DH84 Dragon VH-URD Miss Launceston, in 1934. By the end of 1937, about 24 Australian aircraft had been fitted with radio equipment. Prior to the creation of the Aeradio service in 1938-39, the Civil Aviation Board arranged for AWA to provide an interim ground-to-air communications service. This was achieved through a combination of Coastal Radio Stations and temporary stations at aerodromes. Frequencies of 333 kHz and 325 kHz were allocated for the service. The Coastal Radio Stations provided a ready-made network for communication with aircraft in flight.
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The first permanent aeronautical communications facility provided by AWA was at Essendon Airport in 1935. It was sited near the reservoir on the eastern side of the field, and was connected via a PMG landline to the CRS transmitter station at Ballan. The operators were Mr A.S. (Gus) Hart and Mr Lou Fontaine. Other interim stations were set up at Canberra, Forrest and Groote Eylandt. In conjunction with some rural broadcast stations, the coastal service also collected and conveyed meteorological information for aircraft pilots planning their flights.