[jjoonathan]

Microwave ovens make for poor Faraday cages. The problem is that you only need 30-60dB to "keep the power in" while you probably want at least 100dB to "keep the signals out."

You can test this: put your phone in the microwave and try to call it. Over the years I have had about a 75% success rate.

Other household appliances tend to be even worse; any gaps in metallic seals effectively turn into slot antennas and let signals through. You need a conductive mesh gasket to stop this, and I generally don't see mesh gaskets on consumer appliances.

Your "make an al-foil ball" strategy is what I would resort to in a pinch (I have some nice Anritsu shield boxes, but those are cheating). Quantity is a quality of its own. My only addition would be making sure that the gaps tend to not line up. You want to make it difficult for the "slot antennas" modeling the gaps in each layer to couple to each other.

[rocqua]

For the sake of keeping people from doing stupid things.

DO NOT MICROWAVE YOUR PHONE.

The test involves placing your phone in the microwave and closing the door without turning the microwave on. I'd unplug the microwave before trying this.

[teddyh]

“This is a man who has experienced The Public”

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