On Mon, Jun 4, 2012 at 11:26 PM, <li...@lazygranch.com> wrote: > The low-E coatings are known to attenuate WIFI. WIFI is probably a worse > case than GPS, but the availability of the gear makes experimenting easy. I > think they are sputtered metal either on the glass or on a thin film > applied to the glass. Southwall Technology in Palo Alto pioneered or at > least commercialized the technology. > > They are interference filters. Layered coating 1/4 wavelength thick that send some waves back in phase and other out of phase, they reflect heat and UV be let light go through. I think it is a tin oxide coating of some kind.
Sometime they use silver but only on the inside of a double pane window with the inside filled with inert gas, otherwise the silver tarnishes. OK, I think they can also over coat the silver with an oxide to keep the air away from it I think my windows at home have both. I can see the 1/4 wave coating change color with the angle I look at the glass, the silver simply darkens the glass. The argon gas between the panes is for insulation. I assume it is the metallic silver coat the messes with RF signals. I think the silver is very common in large buildings. But with a large building they make the glass custom to the architect's specifications so no one can know what is in your building. Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
