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How does a radar detector works?

The operation of the radar detector is similar to a high sensitivity radio tuned to the same frequency emitted by the radar. Works like a spectrum analyzer on the frequencies selected by the user, sending an immediate response to the processor when a microwave signal that could be a radar is detected.

Radar detectors receive the signal emitted by the radar and warn us of its presence. The nature of these waves (linear beam) and its low power makes an early detection difficult in certain situations. It is important to appreciate that if the beam does not bounce against an object to the detector, will be harder to detect.

Fortunately, the radio beam is directed towards the road (on portals) or almost horizontal but aside (on tripods). This allows the beam can bounce off small irregularities of the road, guardrail, vehicles that precede us, and so on. This rebound wave is known as Doppler effect, which amplifies the wavelength, so it is easier its uptake.

These small boards can reach the microwave receiver and warn of the presence of a radar in advance. It is therefore evident that the road conditions, location, installation and traffic are a decisive influence on the warning distance.

In the graph we can see the signal emitted by the radar, as it bounces off the ground and grows as it bounces in a vehicle.

In general, mobile radars are detected well in advance, followed by radars on tripods. The ones on portals are difficult to detect in advance, because of the nature of its installation. However, the combination of radar detector and radar alert system (Stealth by Lince) solves these problems successfully (500 m. In advance), being the perfect and more effective combination, better than the two systems separately.