On Tue, 16 Aug 2011 21:01:07 +0800, Man-wai Chang
wrote:

I threw it into a tin can then invert it. It still rang when I dialed
its number.


http://www.ramseytest.com
http://jretest.com
http://www.azimuthsystems.com/platforms-radioproof-402.htm
http://www.octoscope.com/English/Products/octoBox/RF_Isolation.html
etc...

I could also do the necessary math to see how much isolation is
required, but since you didn't supply any details, I won't bother to
try.

Must I use aluminium foil? Why does Al make a difference?

http://en.wikipedia.org/wiki/Faraday_cage
http://www.cvel.clemson.edu/emc/tutorials/Shielding02/Practical_Shielding.html


--
Jeff Liebermann
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Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558