In SX Microcontrollers, SX/B Compiler and SX-Key Tool, kjennejohn wrote:

Two possibilities occur to me:
1. Broadcast the clock from a master clock and sync to it. I suppose you could turn a high frequency carrier on and off to achieve the 3 MHz. I have no idea how this would actually be done.

2. Use the Manchester encoding technique for synchronous data transmission. This method uses data bit transitions to infer the clock. The transitions can be used to sync a PLL. The following site explains this, applied to doing comms over a cable:

http://www.erg.abdn.ac.uk/users/gorry/course/phy-pages/man.html

Hope this helped,
kenjj

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