I was informed by my instructor at Jandakot to make your downwind call and thats it while doing circuits. And then repeat calls from tower (clear touch and go, clear full stop etc)
or coming in from the training area report 6 miles out, then 3 miles out and repeat instructions on how to join. Which are all procedures stated in the Jandakot visual pilot guide. and thats all the calls for arrivals i make