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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Stillpoints cloth.discussion ? posted by raffells on May 2, 2007 at 08:49:48:
Radio waves travel through space the same way as light waves/particles. When they encounter solid objects, they either pass through with some deflection, bounce off, or are absorbed.Good insulators allow them to pass through, and the difference of dielectric constant of the insulator compared to vacuum determines by how much they will be deflected. This is similar to the way a lens works with light.
Good conductors cause them to bounce off, the same way a mirror reflects light.
Materials with intermediate conductivity will absorb some or all of the energy in the radio waves, much like a black object absorbs light and gets warm. If the material impedance to radio frequencies is similar to the impedance of free space, the radio waves will be mostly absorbed. The Stillpoints ERS cloth contains bits of material designed to do this. The technology was derived from that used to make stealth aircraft, which absorb rather than reflect radar waves. The material used in the Stillpoints cloth has high magnetic permeability, so it will interact with audio-frequency signals and should be kept well away from audio circuits.
You can get similar performance from carbon fiber cloth. Carbon fiber is used to make shafts for golf clubs, and you can buy the cloth tubes cheaply. This material works well to absorb the standing waves on audio cables. Oyaide and Furutech make AC outlet cover plates with carbon fiber for the same reason. It has permeability about the same as vacuum, so it will not have as much effect on audio signals as the Stillpoints cloth.
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Follow Ups
- RF absorption. - Al Sekela 09:19:11 05/02/07 (0)
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