Active radar jammers work on the principle of interfering with or overwhelming the doppler shift that occurs
from the reflected radar beam that police RADAR guns require to obtain a vehicles speed.
Unlike police laser (at least in most states), police RADAR can not be legally jammed, in fact, any attempt to do so
(whether one is successful or not, most active radar jammers are not) is a federal offence and violates FCC regulations. Late in 1997, the FCC also ruled that so-called passive-reflector type "radar scramblers" are
also illegal to operate whether they are effective or not (they're not) because the FCC considers any attempt as "malicious interference" and as such can not be
licensed by the FCC (radar detectors are also subject to FCC licensing requirements since they too emit RF).
While active radar jammers are most certainly illegal (unlike laser jammers), they are mostly ineffective, especially against the latest digital RADAR guns.
Older analogue radar jammers did have some jamming effect on older analogue
X-band and K-band RADAR but were often bulky, cumbersome to operate, and ran
continously - setting of every radar detector in the immediate vacinity. This
ended up having the effect of having vehicles in front of you hit the brakes and slow down
which presented problems for drivers equipped with such a radar jammer.
Furthermore, analogue radar jammers tend to lose their calibration and eventually
go out of tune - further diminishing their radar jamming effectiveness over time.
Today, advanced police radar guns can inform the officer that someone is interfering with it
with a radar jammer. It does so easily by monitoring the return RADAR frequency of the jammer during the
time that the police radar gun doesn't transmit - a dead giveaway to the user of an
active radar jammer.
In some cases, a radar jammer may inadvertently produce a higher
indicated speed on the officer's radar gun! Can you picture trying to explain to a police
officer how his 95mph reading of you was introduced by your jammer and not
by your actual speed?
At any rate, police RADAR has progressed today to be primarily digital, which makes them more accurate, less
prone to error, and much more difficult to jam effectively. This is especially true
with the most popular form selling today - digital (DSP) KA.
Don't even think about attempting to use a "passive jammer" or to passively disable or "scramble" police RADAR as your vehicle's own reflections
will most certainly overwhelm any "passive jammer/reflector" by several orders of magnitude.
These devices don't even make a good radar detector.
License plate covers to defeat photo radar and photo laser may be the only effective "passive"
solution to defeat automated traffic photo radar cameras.
Many years ago, our VEIL engineers attempted to formulate a RAM (R.A.D.A.R. absorptive material) coating that would operate
as our stealth VEIL coating does to police laser. However, we found that it wasn't practically feasible
nor effective as stealth - passive countermeasures - are achieved primarily by shape - think F-177A,
B2, or F-22A. Contrary to these stealth jets - which are designed to reflect R.A.D.A.R. away from the source -
our automotive vehicles make strong reflective targets! Oh well, at least we tried!
Our advice is to don't waste your money and stick with one of the better radar detectors,
VEIL, and a decent laser jammer. Drive attentively and you should be OK.
Over the last decade, an even more ominious threat to the motoring public has emerged and unlike
police radar, it is much more difficult to detect, the likelihood of successful court challenges to issued tickets is much smaller, and its
widespread use is increasing rapidly.
"Your chances of getting a ticket are going up rapidly! Laser guns now have cameras inside and with each trigger pull your car and your face are digitally recorded for court evidence."
Carl Fors - Speed Measurement Labs, 2007
Fortunately, we have devised an inexpensive police laser countermeasure
to neutralize this even greater threat that is not only proven effective, but also
not outlawed by the FCC.