Bruce, VE9QRP has been experimenting with using a small Atmel controller to implement the Plan 13 algorithm that provides satellite tracking and Doppler calculations (the same algorithm that I use in my own Python code). It seems silly to drag a laptop into the field to do Doppler tuning when a couple of dollars worth of silicon can easily do the calculations necessary to provide full Doppler tuning. Wouldn’t it be awesome if your rig could do this “out of the box”?