An Advanced SWR meter I built about a month ago. It calculates phase shift so can compute a complex impedance and complex SWR, something most meters cant do. Schematics included.
https://github.com/Syncleus/roes
https://github.com/Syncleus/roes-hardware
This post demonstrates V1 running (the directional coupler wasnt shielded as you can see).
@bamfic @ab3xu