[TowerTalk] Faraday Loops???

[Jim Lux]

At 06:27 PM 11/5/2005, David Robbins K1TTT wrote:
>Now that's a new one on me.  Loops in the walls... well if they are all
>around the room and well bonded to the spg and at all the seams I wouldn't
>think they would cause any problems... of course they may not help much
>either.  With holes the size of a wall they could hardly be called a faraday
>cage, they wouldn't give much shielding from anything except maybe vlf, and
>definitely wouldn't stop lightning.

If the perimeter of the hole is < 1/2 wavelength (or so), then it will 
shield fairly well. The real challenge for building a shielded room would 
not be propagation through holes, but signals carried on wires penetrating 
the shielding wall.

One goal for a moderately widely spaced grid (2 meters/6 ft spacing) would 
be to establish an equipotential surface at the room boundary.