Martin,

Yes a SAEBRTrack type approach is more general purpose than the AA2TX digital pot solution, it can be used with pretty much any pair of rotors.    Tony was never really happy unless you could fill your entire bill of materials for less than $5 - and 4 relays plus the microcontroller and drive electronics blows that budget!

I checked eBay, and apparently missed my opportunity in December for two new old stock Orbit 360's.  I did find an RCA rotor only deal that I could not pass up though ... it arrives this weekend!   

de KM1P Joe

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