Law set out by Civil Aviation Regulation 83 prohibits a person from transmitting on a radio frequency unless qualified to do so
Hence you receive training and an AROC to qualify you
CASR 64.B Transmission on aeronautical radio frequencies
Eligible for AROC if:
While American, the following video is a good introduction to radio use.
In Australia the registrations all start with VH- followed by three letters. While flying within Australia the VH gets dropped and only the three remaining letters are used as the callsign.
Air Traffic Control:
Pilots of Manned Aircraft:
Ground support crew on discrete frequency
RPAS operations will predominantly be VHF frequencies.
Frequencies are displayed on Aeronautical Charts and in AIP (Aeronatical Informantion Publication) publications such as ERSA (En Route Supplement Australia).
VTC (Visual Terminal Chart) chart which includes topographical information, airspace limits and frequency information
ERSA is a list of Aerodromes, with operating information.
HF frequencies vary depending on atmospheric conditions. Usually, a 4 numbered KHz frequency e.g. 6610 See location briefing