[Gerard M]

Ok this might seem a little stupid and somewhat straight forward, but never the less it has still bugged me. When listening to sydneys atc you hear all the different frequencies, but where are they located? Im guessing most of the sydney ones would be at sydney airport tower but for example what about

129.7 i think thats departures?
135.9 - sydney/richmond approach?
etc etc

The reason i ask is that especially with 135.9 sometimes i swear i hear a voice that is the same as somone thats on Richmond tower so i thought that frequency was based out of richmond but then i thought that wasnt right? And with all the melbourne/brisbane centers are they respectively in either melbourne or brisbane?

Thanks for your help, even though it might be a simple question/stupid one!
Gerard