On our spectrum, the transmitter locks to our reciever, switch it all off, switch on our other car with other reciever, transmitter locks to that reciever.
both recievers are bonded to our transmitter, our transmitter will only control our recievers - but "it" will chose a frequency that is "free"......not always the same frequency, and will not control another reciever unless we bond it.
thats pretty roughly it, but it works well and is well cool, no more waiting for a peg or running back to change a crystal cause someone else is "on" it, or having to go catch it after a race cause someone in the next has switched on with the same crystal !!!
Check out cost of extra recievers when chosing transmitters, some cost lots
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