Thanks for the quick response. I think the decision to use ‘flip’ mode and do the transformations of already-calculated AZ and EL bearings need to be done in the tracking software, not the rotor controller software+hardware, because only the tracking software knows the full path of the satellite pass and can determine if the path will cross the end-of-rotation heading of the AZ rotor. The ‘flipped’ AZ and EL would be passed via DDE to the controller software+hardware as normal 0 to 360 azimuths and 0 to 180 elevations and the controller software+hardware would not need to be aware that the tracking is being done in ‘flip’ mode. I realize that the satellite tracking component is not the prime focus of SDR Radio. Maybe this is an item for the ‘future enhancements’ list.
