[time-nuts] GPS through windows

Jim Lux jimlux at earthlink.net
Tue Jun 5 20:42:14 UTC 2012


On 6/5/12 9:14 AM, Chris Albertson wrote:
> On Mon, Jun 4, 2012 at 11:26 PM,<lists at 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.

or Indium Tin Oxide (ITO)  which is transparent and conductive.

>
> 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

yes.. the german young lady was working with triple pane windows filled 
with Argon

>
> 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
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