On 20 May 2008 13:29:22 GMT, Andrew Engels Rump <(E-Mail Removed)>
wrote:
>I have been searching hi and low for something which may solve my problem
>of shielding wifi from the outside world!
Yes. Some of my high-rise office building customers, that have glass
walls through which they pickup considerable interference, were having
problems. I solved most of them by carefully locating the access
points and client radios, eliminating un-necessary wireless links, and
switching from 2.4 to 5.7GHz wireless.
>We (pulz8 Communications) are testing wifi/wireless connections to be
>used on trains (for instance to provide wifi or CCTV to the passengers)
>but one of our neighbours is a script kiddie who loves to fill the ether
>with disassociation frames causing a lot of extra problems for our
>technicians.
I've had similar problems with wireless hackers. I personal
visitation was usually all that was required to get their attention.
They usually think they can get away with anything as long as they are
not identified. If you know who they are and what they're doing, the
picture changes considerably. However, if they fail to cooperate,
calling in the law doesn't do much good. I have other methods of
getting their attention, but none of them are legal, so I won't
itemize.
If the neighbor is fairly close, just install a large dish antenna on
your building pointed directly at him. You don't have to connect
anything to it, just make sure he can see it. His imagination will do
the rest.
>Are there anyone out there who have experience in painting a room with
>shielding paint?
No. Silver doped paint is useful for small areas and is of course
rather expensive. The carbon filled stuff (Aquadag) doesnt' really
work too well at 2.4GHz. Your best bet is aluminum foil. I've built
shield rooms in the distant past out of sheet copper, brass screening,
and berillium finger stock. It's not cheap and very difficult to keep
microwave frequencies out completely. A small gap is enough to pass
some signal. I don't think you need much in the way of attenuation to
keep out the neighbors. Some brass screening on the facing doors and
walls should be sufficient.
Radio service shops also have similar problems with on channel RF
interference. It's very difficult to tune up a receiver when there's
a high power transmitter next door on the same frequency. Some rent
large metal storage containers and use them as screen rooms. There
are also small RF shielded boxes that will do the job.
<http://www.ramseyelectronics.com/te/default.asp?page=rften>
There are also small test boxes designed for wireless testing that I'm
too lazy to dig out the URL.
Lots depends on what manner of testing you're doing. Turning your
test lab into an RF echo chamber will not help much. You might want
to look into RF absorptive materials instead of RF reflective.
>I have found reference to Spyguard and Force Field
>Wireless (which apparently has gone out of business)
<http://www.baesystems.com/ProductsServices/ss_tes_atc_adv_mat_stealthy.html>
>and also an ACM
>article and other pages on the internet which describes how to make a (no
>it is not a) "Faraday cage" but because of the nature of our hardware we
>would like to take the paint approach - unfortunately our test room has
>windows!!! :-)
Well, you're not trying to block *ALL* frequencies, just 2.4 and
possibly 5.7GHz. You don't need the ultimate in shielding to do that.
A metal screen door, metal window screens, some aluminum foil or mesh,
and you'll block most of the junk.
--
Jeff Liebermann
(E-Mail Removed)
150 Felker St #D
http://www.LearnByDestroying.com
Santa Cruz CA 95060
http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
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