Peter Peres wrote:
........
>Conductivity is not the key here, but a certain bulk resistivity at AC. If
>that is equivalent to the characteristic impedance of the plastic (i.e.
>the complex components of Z at F0 in that material) then the material is
>the best possible absorbent. Much better than metal which reflects
>everything back in to bounce around and exit through the fan gills and
>power cords.


So what does this say about my Serpac ABS box, whose material is
touted as "ABS Stainless Steel Fiber"?
=========

This is why absorbent sponges are often used inside RF proof
>cases. They attenuate the energy bouncing around inside and dissipate it.
>I suppose that you could make the case out of 'sponge' and live to see a
>FCC test.
>

The sticker says 55-60 dB attenuation at 30-2000 Mhz. Is the energy
absorbed or reflected back inside? The case is certainly not spongy.

- danM

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