Unfortunately, while mounting one of my LimeSDR boards in Luftek’s enclosure I have accedentally detached thin black square plastic element with “GU” indication on top of it. I can see such elements placed near matching networks for all high frequency TX/RX ports.
Since I am not good at electronics, I would like to ask you to describe what is its function and is it critical for it to be in that place? How, if at all, is it going to affect performance of RX2_H port? Is it safe if I simply use some fast glue to make sure it won’t pop out again?
Totally different than what I was expecting. My suspicion is that it may just be cosmetic, but I don’t know. I’d leave it as is, if it was my board, and compare the performance of RX2_H to RX1_H, taking screen shots of each with the same settings.