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Don't Buy Passive Radar Jammers!
Passive Radar Jammers Do Not Work!
Rocky Mountain Radar produces what is called a “passive radar scrambler”, but they call it a radar jammer, because the phrase “radar jammer” has for a long time implied a very effective device.
The Passive Radar Scrambler is a radar reflector device.
Understanding Passive Radar Scramblers
Remember your youth and the time you heard your first echo as you yelled at a barn or large building? You discovered that if the barn was large, you heard a large echo reflected back to you after yelling at the barn, or a small echo (or no echo) when you yelled at a small barn or building.
The barn was effectively an audio reflecting antenna. It received an audio signal (your voice) and reflected the audio signal back to your ears (the audio receiver.)
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 passive scrambler typically has 2 square inches of reflective antenna.
When the RF signal strikes the car/truck, it also strikes the passive scrambler and the reflection is now called the Doppler Signal, since it changes 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 divide (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 power to defeat the larger vehicle Doppler signal.
Always question Passive Radar Scrambler Claims!
A potential buyer of Passive Radar Scramblers should question the claims offered by Rocky Mountain Radar, the largest manufacturer of passive scramblers. When a claim is made about jamming to within 100 feet, (the "punch-through" distance where the radar gun overpowers the FM Chirp Signal of a Passive Scrambler), Rocky Mountain Radar should be able to prove it with written test reports and/or videos from Speed Measurement Labs (SML), the recognized authority in this field.
However, Speed Measurement Labs has shown a multitude of times that Passive Radar Scramblers are ineffective from two miles, 1 mile, 1/2 mile, all the way to the radar gun; so, how is it possible that a Passive Scrambler can provide the advertised 100 foot "punch-through" protection? They can't! But the words sound so good, that people simply believe the words, and forget to ask for actual test proof. RMR can't provide unbiased performance test results from SML or Speedtest proving their products work.