Re: Increasing wireless internet signal between buildings

Jeff Liebermann wrote:
"Peter Pan" <PeterPanNOSPAM@xxxxxxxxxxxxxxxxx> hath wroth:

Uh oh, should work fine UNLESS you have tinted/solar radiation
protection that most office windows have, that also tend to
block/attentuate radio signals.. Do your office windows open, or are
they the sealed type (that most likely also block the signal).. Can
you try from outside rather than thru the glass?

There are now several different types of window tints, films, dyes,
and coatings. The common aluminized mylar coating will block RF quite
nicely. The ceramic coatings pass RF easily. The problem is that
they're rather expensive.
<http://www.tintcenter.com/films/huperoptik/ho_c/>
<http://www.huperoptikusa.com>
Most such ceramic coatings are used on automobiles and homes. I
haven't seen any on office buildings yet. I couldn't find anything on
the RF characteristics. If it trashes cell phone reception, it's
probably a metalized film coating.

I once had to deal with getting a 2.4GHz wireless link through an
office building with tinted windows. It was like trying to go through
a brick wall. I ended up with a roof mounted antenna and radio,
powered by PoE.

Then, there's RF blocking wallpaper:
<http://www.baesystems.com/ProductsServices/ss_tes_atc_adv_mat_stealthy.html>
Sigh.

Don't know what type exactly, but the premade tinted ones on many of the new
office buildings nowadays (not a film, but something in the glass to
minimize sun fade, and the windows don't even open) usually block radio
signals, just noticed a few years back, was in the dentists office, and my
pda only saw one ap, but when I went outside to smoke, it saw 38! For the
last few years i've been doing the same sort of thing at other offices, and
it seems that in many of the newer buildings, get very limited signal
inside, walk outside and there are lots... not scientific at all, just fired
a neuron when the op talked about about a very poor signal at 120 feet thru
the glass with a directional USB device... Doesn't seem to happen with older
office buildings that have the older opening windows...

Generically, I wonder what effect that sort of glass would have tying to do
a wireless link between buildings thru the windows....


.

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