I have problem with my receiver. I created BPSK modulator in PL and using digital loopback, received constelation is perfect but when using rf loopback (using coaxial cable) I see that constelation has phase offset. I know that LO for transmitter and receiver are in different phase but I want to ask how to compensate this differences. Maybe somebody had similar problem and could guide me how to resolve this issue or where to find an information how engineers used to eliminate this phase offset?
Thanks in advance !