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xarqi
xarqi, Generalist
Category: Health
Satisfied Customers: 596
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Impulse Radar

Customer Question

How to defeat ultrawideband radar
used for all the wrong reasons?
(broadband, impulse radar)

Also, how to defeat listening device
so sensitive it can probably detect
breathing through walls???Could it also
use same as above?
Please, no foil, screendoor, or mirror jokes!!
Submitted: 11 years ago.
Category: Health
Expert:  xarqi replied 11 years ago.
You have classified this under "Health", which makes me wonder
if your chief concern is the possible health effects of surveillance
by these methods, rather than simply means of defeating them.

The answer I would give depends on what your concerns are, for
example, to suggest jamming UWB radar would increase
your exposure to EM radiation, and so might be inappropriate if
your chief concern was one of health.

Could you please clarify?
Customer: replied 11 years ago.
Reply to xarqi's Post: Yes, that is a big concern. Would the exposure
be a big health risk and over how much time?
Actually I sent this to you because I did not see
a tech category on the menue which I now know is there. I also knew that impulse radar is used in the health field so I sent it to you.(Also
thought I would get a serious answer)I also
know that the latest scientific advances are
used by PEOPLE WITH DISABILITIES.
My biggest concern is in blocking/jamming same
with something the average person would have access to.
Also the 2nd part of the question would,hopefully,
be tied in. An answer to the 1st question,if it works, would be compensated in full.
Expert:  xarqi replied 11 years ago.
In brief, you have little to be concerned about.

First, there is no strong evidence of deleterious effects of
exposure to low levels of non-ionising radiation such as is used
in radio, television, microwave, and radar applications, or which
is a byproduct of electricity transmission. Such radiation is
probably less harmful than light, since it is of a lower frequency
and thus carries less energy per "photon" than light.

Secondly, the nature of UWB transmissions is that they carry
perhaps only one hundredth of a percent of the energy of
conventional spread spectrum transmissions. Indeed, this is
what makes these transmissions difficult to detect: their
intrinsic energy is so low.

Thirdly, the likelihood that you are exposed to such
transmissions is negligible unless you are immediately adjacent
to a faciity in which they are used, or routinely misuse such
devices as ground-penetrating radar. The idea that
governments are snooping on private citizens with this
technology is pure fantasy.

That having been said, should you wish to eliminate the
potential for exposure to this type of radiation, and incidently
screen yourself from potential snooping, one effective method
exists. That is to enclose your living/working space in a
grounded Faraday cage. This can be constructed from wire
mesh with holes smaller than the smallest wavelength to be
screened. For UWB, this is a little hard to determine. The
highest frequency I have found in the literature is 81 GHz. This
corresponds to a wavelength of about 4 mm, so the holes in the
mesh must be smaller than this. Once completed, ensure the
cage is electrically grounded. A metal spike driven a meter or
more into moist soil would be one method.
That's it. No EM radiation of wavelength greater than the mesh
size will be able to enter (or leave) the Faraday cage.

As for the second part of your question, the simplest means to
defeat such an eavesdropping technology would be to whisper
while maintaining a moderate level of ambient noise.

It is perhaps technically possible to use UWB radar in real time to
determine lip positions, and thus lip read, but this seems far-
fetched, and, should you be shielded by the Faraday cage
described above, ineffective. I raise this since it is the only
way that I can conceive that a defense against one surveillance
would also defend against the other.

--
If this response is satisfactory, please advise and I shall post it
formally for your acceptance and payment. If it is deficient,
please indicate how it could be improved.
Customer: replied 11 years ago.
Reply to xarqi's Post: Sounds Good!! Will have to see if feasable with
coop-will make some calls for cost/installation. You ever heard of a spark gap noise generator??
2nd question-think of a reciever that can pick
up breathing through walls(Israeli broadband radar accessory)or to put it another way the
most powerful receiver available(what it could be
I don't know)and how to scramble the incoming
or return signal be it by brain waves or soundwaves.
(In this re: is there a devise that can record brainwaves and LEARN to transcribe same into words?)
Expert:  xarqi replied 11 years ago.
Should I then post a formal answer for your acceptance and
payment?

As for spark-gap generators, yes, I have heard of these. The
original Marconi device used for radio transmission avross the
Atlantic in 1901 (I think) was just such a transmitter. Essentially,
any spark discharge generates broad band electromagnetic
noise.

As for detection of sound waves directly, whispering masked by
ambient noise will work.

As for brain waves - the electrical activity of the brain does
produce EM radiation. Any moving charge must. The simple
fact is that the amplitude of such waves is orders of magnitude
too low even for detection by an adjacent instrument. Given the
inverse-square law of energy versus distance, to pick this up
remotely is just not possible. Imagine a huge radio telescope in
your room trained on your head. That is where you would have
to start.
No. There is no device that can record brainwaves and learn to
transcribe these in words.
Customer: replied 11 years ago.
Reply to xarqi's Post: list the answer, I will pay you.
Expert:  xarqi replied 11 years ago.
I'm pleased that you found my answer satisfactory. Thanks for
agreeing to accept it.

Note, this is identical to the free post text above, so there is
nothing new to read here.


Quote:

In brief, you have little to be concerned about.

First, there is no strong evidence of deleterious effects of
exposure to low levels of non-ionising radiation such as is used
in radio, television, microwave, and radar applications, or which
is a byproduct of electricity transmission. Such radiation is
probably less harmful than light, since it is of a lower frequency
and thus carries less energy per "photon" than light.

Secondly, the nature of UWB transmissions is that they carry
perhaps only one hundredth of a percent of the energy of
conventional spread spectrum transmissions. Indeed, this is
what makes these transmissions difficult to detect: their
intrinsic energy is so low.

Thirdly, the likelihood that you are exposed to such
transmissions is negligible unless you are immediately adjacent
to a faciity in which they are used, or routinely misuse such
devices as ground-penetrating radar. The idea that
governments are snooping on private citizens with this
technology is pure fantasy.

That having been said, should you wish to eliminate the
potential for exposure to this type of radiation, and incidently
screen yourself from potential snooping, one effective method
exists. That is to enclose your living/working space in a
grounded Faraday cage. This can be constructed from wire
mesh with holes smaller than the smallest wavelength to be
screened. For UWB, this is a little hard to determine. The
highest frequency I have found in the literature is 81 GHz. This
corresponds to a wavelength of about 4 mm, so the holes in the
mesh must be smaller than this. Once completed, ensure the
cage is electrically grounded. A metal spike driven a meter or
more into moist soil would be one method.
That's it. No EM radiation of wavelength greater than the mesh
size will be able to enter (or leave) the Faraday cage.

As for the second part of your question, the simplest means to
defeat such an eavesdropping technology would be to whisper
while maintaining a moderate level of ambient noise.

It is perhaps technically possible to use UWB radar in real time to
determine lip positions, and thus lip read, but this seems far-
fetched, and, should you be shielded by the Faraday cage
described above, ineffective. I raise this since it is the only
way that I can conceive that a defense against one surveillance
would also defend against the other.

xarqi, Generalist
Category: Health
Satisfied Customers: 596
Experience: 
xarqi and 3 other Health Specialists are ready to help you
Expert:  Nick Sparks replied 11 years ago.
I rarely have anything to add to a xarqi answer, but I will
offer that you might enjoy a visit to the Spy Store at http://
www.thespystore.com/

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