Ian, have you figured this one out? ...I am very interested in designing little FM radio tranceivers for communication between robots. I have seen some inexpensive little modules for sale, but I'd like to understand the theory and design my own! ...I'm also interested in using these transceivers as beacons for triangulation purposes for robot positioning / navigation.
Here in America, we have to design our RF circuits to comply with Part 15 of the FCC rules. Does Australia have any kind of regulatory body like America's FCC?
Also, I know that it must be possible and relatively inexpensive to design RF transmitter circuits on 5-9 VDC because I see cheap toys like Walkie-Talkies and RC cars at stores for $10 all the time! ...And generally, I believe the RF toys here in America have either 27 MHz or 49 MHz crystal oscillators, for what it's worth.
If you figure this one out, please let me know too!