2013年1月6日星期日

How to Protect Two Way Radio Equipment From EMP

Electronic devices are vulnerable to an electromagnetic pulse, or EMP. Solar storms and atomic explosions high in the Earth’s atmosphere cause such EMPs. It is not difficult to protect against EMP damage, especially for small items like amateur or public safety 2 way radios. You can buy products that will protect your radios or you can improvise EMP shields from other items. There are several simple options.
1Measure the size of the radio equipment to determine how large a volume you need to protect. You may want to store other small items like a laptop computer; USB hard drives and thumb drives; cell phones; and electronic badges, keys, or other vulnerable items. Plan to locate the EMP safe near a cold water pipe, where the safe and the pipe can be connected by a soldered copper grounding strip, or to bury an anodized aluminum garbage can underground, as maximum protection from extreme EMP events.
2Use a nonfunctional microwave oven as an EMP safe. As long as the oven is intact physically, with no gaps between the door and the body, it will function as an EMP shield. While it will protect against some threats, for better protection, solder a braided copper grounding strip from the metal body of the oven to a cold water pipe (ground). This will protect against interior arcing from an extreme event.
3Use a commercial laptop or gun safe, if it is made from metal. For the best protection, solder a braided copper grounding strip from the metal body of the oven to a cold water pipe.
4Use a commercial anodized aluminum garbage can for larger items. The lid must fit tightly without gaps. Items in the can should be isolated from the metal interior by nonconducting materials packing peanuts, cardboard boxes or even by coating in paraffin wax. Like a microwave oven or metal safe, for the best protection, solder a braided copper grounding strip from the metal body of the oven to a cold water pipe.
5Bury a garbage can if you cannot solder it to a cold water pipe (or other ground point). Dig a hole deep enough that the lid is at least 18 inches from the surface when seated in the hole. Pack the can and then seal the gap between the lid and the can with waterproof tape or strips of cheesecloth soaked in melted paraffin wax.

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