I think I am going to try this. I've learned the AVR toolchain, played with the Si5351 library by NT7S.
The change looks doable so far - just rip out the PLL parameter calculation for Si570 and replace with different ones for Si5351A.
But I am sure there are gotchas on the way.
One thing I don't want to learn is Windows programming for the control software (cfgsr-setup). But it would be nice to have at least some functionality of it, like burning the initial frequency to EEPROM.
Maybe somebody did this conversion already, or at least tried? Any tips?
73, Mike AF7KR