Calling frequencies in Australia
The national FM calling frequencies are 146.500 MHz on 2m and 439.000 MHz on 70cm. For SSB the national calling frequencies are 144.100 MHz on 2m, 432.100 MHz on 70cm and 50.150 MHz on 6m, with 50.110 MHz for international contacts. APRS is on 145.175 MHz.
Repeaters
Australian 2m repeaters use a 600 kHz offset, in blocks at 146.6–147.0 and 147.0–147.4 MHz. 70cm repeaters mostly use a 7 MHz offset, with outputs at 438 to 440 MHz. 6m repeaters use a 1 MHz offset, and some 6m channels are reserved for particular call areas.
How the VHF and UHF bands are organised
The VHF and UHF bands follow the same pattern almost everywhere: CW and weak-signal SSB at the bottom, with calling frequencies for long-distance contacts, then beacons, then FM simplex, repeaters, digital voice and data, with satellites in their own protected segments. Keep weak-signal segments clear of FM, and keep FM off the beacon and satellite segments.
For working out repeater channels and offsets, see the CTCSS tone list, and for FT8 and other data frequencies the digital mode frequencies page. The satellite pass predictor shows when to listen on the satellite segments.
Questions
What is the 2m calling frequency in Australia?
146.500 MHz FM. On 70cm it's 439.000 MHz.
What is the APRS frequency in Australia?
145.175 MHz on 2m.
What offset do Australian 70cm repeaters use?
Mostly 7 MHz, with some 5 MHz. 2m repeaters use 600 kHz and 6m repeaters 1 MHz.
Can Foundation licensees use 6m in Australia?
6m is available to Standard and Advanced licensees. Foundation licensees can use 2m and 70cm.