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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 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 inffective, especially against the latest digital RADAR guns.
Older analogue 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 these kinds of jammers.
Furthermore, analogue jammers tend to lose their calibration and eventually go out of tune - further diminishing their 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 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.
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 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 inffective, especially against the latest digital RADAR guns.
Older analogue 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 these kinds of jammers.
Furthermore, analogue jammers tend to lose their calibration and eventually go out of tune - further diminishing their 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 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.