There is an interesting article in EETimes about chaotic oscillator circuits. It made me think of mobile radio groups where all members run AFC. Designers usually avoid using the receive AFC setting to adjust the transmit frequency, unless there is one known good node in the network that others can synchronise with. When all nodes are equal and transmit frequency is based on the last signal seen, then it has been assumed that the group as a whole will wander off frequency and also may split up. This work suggest there may be some cleaver alternatives.