The Official IARU member organisation, representing Radio Amateurs in Australia. However, they may also be used as calling channels for initial contact before switching to a simplex frequency. As well, they provide contact facilities for radio amateurs in remote locations where simplex communication is not normally possible.
Repeaters have timers to limit transmission length.
This allows others immediate access. To gain access to a repeater which is being used by others, simply announce your callsign during the pause between overs. If using a repeater and another station announces its callsign during the pause, let that station go ahead immediately. He or she may have an urgent message. Do not reset the timer to extend your own transmission time.