Sniper2 , 10-14-2025, 08:46 PM
So i just got from testing , barely passed but man i have no idea what went wrong. ( passed calss A but not B or it is the other way around*)From the frequencies in the report i know it is USB and a serial cable but how ? and why? i have continuous GND plane and i used the right impedance profile. Do i always need ferites on my cables? Or Am i picking up from the USB in my other cables? for the serial link i can put some series resistance and a extra cap to slow the edges and i should be ok since i ham just barely crossing the lower threshold .USB seems to be the problem ut i even have a CMC on it what more can i do to it?PS it is in a box so that is shielding too but i have very long USB cables so i suspect i am radiating from them. Any ideas?