Very interesting.? I'll have to go through the whole presentation again to have a better understanding, but here's what I recently did.
I've built a v12 on an aluminum chassis.? I have a single point ground for power.? I twisted the power lines for each board and then covered them with braid.? I grounded only one end of the braid to the chassis based on something I read a long time ago (Faraday shield).? I covered these with nylon braid to prevent random contact with the chassis.? This seems to have reduced my noise floor a bunch (10-15 pixels if you will) and it seems to reduced "birdies" at various points on each band but I'm not sure this is the right way based on the presentation.? The power lines are not signal lines so there is no need to have a current return path for a "signal" (opinion).
I don't know if the mounting screw holes on the boards are connected to the board ground plane, but I grounded each board to the chassis with a short braid (not a pig tail). The power lines braids are grounded at one end to the chassis at various convenient points, the braids not pig tails.? RF connectors are grounded to the chassis, but everything else (headphone, key, ptt, encoders, displays) are not grounded to the chassis.? The 20W PA is not grounded to the chassis.
This all gets back to my excessive noise thread.
Thoughts? Ground both ends of the shields?
Thanks
Mark
KU3O
