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| Joined: | Jun 26th, 2009 |
| Location: | Heart Of Arizona Indian Country, Arizona USA |
| Posts: | 662 |
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Grounding the cage is something of an option. However, a length of wire and a couple of alligator clips can be used. Clip one end to the cage and one end to a suitable ground and you are effectively dissipating the RF energy amassing around the enclosure.
I would point out the size of the mesh you use is important because different signals have different size wavelengths.
For example… AM radio has a large wavelength than FM. While a larger mesh will attenuate an AM signal, the same size opening might not completely shunt an FM signal. Hence, the smaller the opening of the mesh, the smaller the wavelength you can block.
Aluminum window screen is a perfect size for our purposes. However, if you feel the need to use a conductive mesh with smaller openings, very fine copper and brass mesh can be obtained from craft stores, hardware stores and even from ebay.
You could even have your recorder sitting inside a copper screen that is sitting inside of an aluminum screen enclosure.
Here is a graphic on wavelengths courtesy of Nasa.Gov:
Attached Image (viewed 674 times):