I think the idea of using a code that is unique to a transmitter to process only certain received packets is a great idea, although I wonder what the processing burden would be on a receiver receiving and rejecting lots of packets from other transmitters? Perhaps the different frequencies would still be used, so that there wouldn't be that many transmitters on the same frequency at the same time? It looks like there is a solution there somewhere.

I recently bought an RTF park flyer for my 12 year old daughter, who I am proud to say has now soloed, and I am pretty sure it does not operate in the 72 Mhz band. Of course that doesn't prevent someone from buying a 72 MHz band radio separately and using it, but at least some of the park flyer setups that come with a radio should not cause us problems.

Travis