Gentlemen-
Please allow me to allay any ideas that laser and radar "jammers" which are
available on the market can actually work.
This whole marketplace is based entirely on the ignorance in general by the
buying public as to how laser and radar systems really work. Note this is
not an insult, it would be unreasonable to expect the general population to
understand the finer points of this kind of thing. And the reason these
don't work is precisely due to the finer points.
In order to create a radar jammer, one would have to create a powerful
transmitter which transmits radio energy on the frequency at which the
antenna of the radar gun is tuned. Unfortunately, the FCC forbids us from
transmitting on the frequencies which police radar operate, they are
licensed only to the police. While it would be very possible and even
simple to build such a transmitter yourself, suffice to say it'd be
extremely easy to determine you were using it, and highly illegal, a
federal offense on par with any kind of radio piracy, a felony. Similarly,
"intentional radiators" which are defined by the FCC as being any product
sold for profit which intentionally transmits radio energy, require a
license from the FCC prior to sale. It would be possible, on a very small
scale, to sell this type of thing with no license and perhaps even not get
caught. An ad in a Motor Trend magazine is a dead giveaway. I promise,
none of these that are on the market can possibly work, since they can't
transmit on the necessary frequencies.
Ok, so the idea that you can somehow have a "passive" jammer, which
reflects energy from the source (the radar gun) back to the radar gun,
that's the most hilarious thing. Let me assure you, the the way radar
works is by reflecting this energy back. Putting a good reflector in your
car will make it much more susceptible to police radar. Not that a
reflector the size of a pack of cigarettes will have any effect whatsoever
on the reflectivity of a car.
Laser works similarly, only the Laser is RF energy focused in a different
way, and of a very different wavelength. It would be possible for you to
create a laser which would saturate the pickup of the police laser device
and disable it from making pulse-timing decisions, but again this would be
easy to detect you were doing it, and making and operating a laser of the
required amount of power would require a CDRH file and a license, which I
am sure you don't have. Again, a federal offense, a felony.
An audio CD is designed specifically to efficiently reflect laser energy at
a particular range of wavelengths. Putting one in your car will radically
improve the effectiveness of the police laser. Police laser uses your
license plate as the primary point for reflecting, since it's a good
reflective surface that works at many wavelengths (plus it's a material
which is controlled by the state). So constructing some kind of filtered
cover which absorbs the wavelengths necessary to prohibit police laser, and
putting it over your front plate, would work, provided the rest of your car
does not reflect. Think of it as a stealth paint job. Problem is you'd
have to also paint the windows, wheels, tires, etc, in order for it to be
effective. The windshield is a very big target, and a pretty good
reflector at those invisible wavelengths.
In many states these filtered license-plate covers are illegal and you'll
get a ticket just for putting one on. Hardly the result you're after.
Don't give in to the hype and show yourself to be a fool. In order for any
of this to work, it has to also be highly illegal, and not hard to spot
who's breaking the law. The thing is, people buy one of these, and then
they speed all the time and don't get a ticket, assume the device is the
reason. I promise you if you were using a legitimate homebrew jammer that
would work, the cop would pull you over instantly regardless of speed,
merely to determine what you were doing to screw up his radar. There's no
reason they can't throw you in jail and call the FBI over something like this.
-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Josh Karnes <>< "As long as the devil gives you slack in Austin TX
your chain, you think you are free."
- Dick Brown
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