I have couple quite big full copper cavity filters meant for Ghz range. There are lot of screw which seal the cavities very tightly. Do the cavities have some gas like hydrogen inside of them for better propagation or is it just for not letting the dust etc in?
I did open one cavity and I wonder if I did let some gas out what was necessary for its operation?
I did open one cavity and I wonder if I did let some gas out what was necessary for its operation?