I have a question on adapting a homemade Faraday cage. I am getting a little paranoid about these two North Korean satellites in orbit over our country.
Would a metal mailbox, such as can find at the local hardware store, be acceptable protection? I am trying to put together something simple for really, really cheap! It has a larger size and is easier to obtain. It is also cheaper than some of the other options I have been reading about on constructing a Faraday cage. T.B.
Most any metal container will work as a Faraday cage with a few simple preparations. The metal needs to have a good electrical connection between the various parts. If you are using painted metal, you will have to remove the paint where the electrical connection needs to exist. Galvanized metal works really well. If a metal mail box is not large enough, you can consider a 30 gal trash can with a metal lid.
Once you have placed your objects inside, use a good aluminum foil tape to completely seal any seam. The aluminum tape must make a good electrical connection and an inexpensive digital multi-meter works well to verify. Also, if you are having issues with the electrical connection, you can use an alarm foil splicing tool to ensure that connection.
While this will give you good EMP protection, it also means that every time you open the container, you will have to reseal it. To make a container that can be regularly opened is more difficult due to the requirement of the good electrical connection seal.