I'd like to interface with a legacy system that uses BPSK at ~5MHz to transmit data. I understand the basic idea of BPSK - that it's a 180 degree phase shift to represent data - but I'm having a hard time finding examples that take an Arduino or something and create a BPSK radio.
Most of the documentation I find online shows a basic block diagram like this:
I understand we're mixing sine phases based on bits from a processor, how would I implement this with OpAmps?