One of the original passive scramblers was made by Rocky Mountain Radar, called a Phazer. The newer version is called Phazer II, as this image shows. The Watchful Eye was a passive scrambler produced by Phantom Technology, of Denver, CO. Phantom Technology also produced an identical product, called the Mirage 2001 and Mirage 7000. These were the only scramblers produced with an 8 square inch receiveing antenna, as opposed to the typical RMR scrambler with 1 - 2 square inches of receiving antenna. One of the newest RMR scrambler products is called an RMR C450, claiming to jam radar and laser. Another is called the RMR-C430. Many tests conducted by Speed Measurement Labs, Tiger Lily Products, Road and Track, Car and Driver have all concluded that the RMR products tested over the last 8 years in actual radar and laser encounters, can not jam radar or laser.

Understanding passive radar scramblers will verify to you that radar laser scramblers can not provide the jamming protection the manufactures claim.  Active laser jammers and superb radar detectors are the solution. 

When radar is triggered from a radar gun, it travels down the highway as an invisible wave and is referred to as the RF signal. As the signal travels down the highway, it grows in height and width and gets progressively weaker in strength as it moves away from the radar gun.

By the time an RF signal strikes the front of your car at 1000 feet, it is 1 million times weaker than when it was first triggered. The average car offers about 1000 square inches of reflective surface area. A typical passive scrambler today has 2 square inches of receiving/reflective antenna. When the RF signal strikes the vehicle, it also strikes the passive scrambler and the reflection is now called the Doppler Signal, since it has changed frequency somewhat as a result of the reflection.

The net result is 1000 inches of RF Doppler Signal reflection combined with 2 square inches of Scrambler chirp noise. Even to a person who dislikes math, one can devide (1000/2) and come up with a 500:1 ratio of vehicle Doppler strength over the passive scrambler strength. Since the passive scrambler is not designed to transmit, it can not come close to enough reflection signsal to defeat the larger, Doppler signal reflected off the vehicle.

The movie, called Blues Brothers, had two large, speaker horn antennas on top of their Dodge car. Those horn antennas were quite large. Imagine if a car had a receiving horn antenna about the size of those two speakers on the Bluesmobile, then enough RF energy could be collected, noise added, and refelcted to the radar gun.

But who wants to drive around with a large passive scrambler that is 4 feet wide and 2 feet tall on top of your car or truck. The Phazer, Eclipse, Shadow passive scramblers produced with small passive antennas, could on average provide 1-3 seconds of scrambling from 1/2 mile away from the radar gun, but nothing closer. Since most radar is used under 1/4 mile from the radar gun, then these passive scramblers were not effective jamming a radar gun.

The passive scramblers called Watchful Eye, Mirage 2001, Mirage 7000 had 8 square inch antennas, and provided on average 7-9 seconds of jamming from 1/2 mile; but this is still not sufficient jamming, as it can not protect a driver closer than 0.35 miles from the radar gun. that is the very best a passive scrambler has ever worked.

Radar scramblers, or passive scramblers are not jammers, but the largest manufacturer of passive scramblers, Rocky Mountain Radar, refers to their products as “jammers. Passive scramblers do not transmit a jamming signal, thus by technical design, it can not be called a jammer, since a jammer is a transmitting device. Radar Scramblers are radar reflectors, as it captures a very small amount of the incoming radar signal, adds chirp noise to small received signal, then reflects that small chirp signal back towards the gun.

Many web sites offer passive scramblers, because the marketing words are strong, and the customer comes away with the idea that the passive scrambler will do everything for about $325 per purchase; i.e., it will detect and jam laser, and it will detect and jam radar. But, that is not the case. It is one thing to claim to jam radar, but it is quite another thing to prove that your product can infact jam radar.

To date, March 2006, no passive scrambler has proven to jam radar in actual road tests, conducted by a multitude of companies. If you want protection, then check out the best radar detectors, Bel STi Driver, Escort 8500 X50. The best laser jammers are Blinder M25 and M45 laser jammers. These products have been tested in actual road tests and have proven to be the very best.