We are looking into setting up a very basic shielded chamber inside a small room at my company to be able to perform some basic relative radiated EMC measurements.
We will buy a somewhat cheap spectrum analyzer together with a set of near field probes and a biconical antenna, and want to have a room where we can perform measurements with as little interference as possible.
So I've been looking into doing a very cheap DIY shielded chamber inside the room, by building a wooden frame and wrapping chicken wire around the frame with thick aluminum foil to seal all joints.
The only thing I still feel unsure about is how to do the filtering for the I/O panel. What we need to get into the chamber is the following signals:
- 230V/50 Hz power
- USB 2.0
- Coax antenna connector for biconical antenna
- Two BNC connectors for DC power supply
- SMA connector for various RF stuff
So my question is how I would filter all of these signals in suitable ways? Our plan right now is to slap ferrites on all signals, but I don't think that will accomplish very much. What would be a better way?