/diy/ - Do It Yourself

I just reverse engineered the analog front end for a K-band radar gun and while I have a vague idea of what's going on this circuit is pretty confusing and I'd appreciate if any RF guys or HAMs or anyone with experience with microwave circuits could explain what some blocks of this circuit are doing. You don't have to go into a ton of detail unless you want to.

The part the schematic reflects is circled in red. The other half of the board is voltage regulation, primarily for varying power to the gunn diode which is connected across the two spade lugs in the back.

The entire gunnplexer/antenna connects via the RCA jack through a Schottky mixer diode. I believe the anode would be connected to the center pin and the cathode is grounded at the other end to the waveguide but it's hard to tell because the diode is buried in the waveguide and I can't really get probes in there to test it without grounding them on the waveguide by accident.