Many people believe that buying a radar detector for your car, they never will have to pay more fines for speeding . It is only necessary to select in the automobile black box with flashing LEDs and an audible signal. How to choose a radar , and if this is in fact we describe in this article.
Next to answer the question how to choose a radar detector ( radar ) is necessary to understand what frequencies work radars determining the rate . State Committee for Radio Frequencies ( SCR ) for radar speed measuring devices , allocated the following frequencies :
- X-band (10.525 GHz 25 MHz)
- K-band (24.15 GHz, 100 MHz)
- La-range laser devices.
Radar operating in X-band were the very first, and are now considered obsolete. Most of velocity meters, standing on the arms inspectors, traffic police are now using K-band and works in pulse mode, when a signal is sent to measure short pulses in a split second. Modern radar detectors can cope with the impulse of the radar, if it is determined signal running ahead of the car. Otherwise, if the radar will be sent only to your car, you simply do not have time to react and slow down. A separate challenge for the majority of radar detectors are laser radar. They have a very narrow beam in contact with the car which takes place to determine its speed. Many radar detectors are powerless against modern laser radar type LISD2 and Amata. Only two models of radar detectors Cobra brand according to statements by their manufacturers are able to determine the reflected laser signals due to the circular review. Fortunately, this type of radar there is still rare in the traffic police inspector.
When choosing a radar detector you want to check him have at least the following modes:
- Ultra-X determines the pulse signals in the range of X;
- Ultra-K determines the pulse signals in the range K;
- Instant-On - determines the inclusion of short-range radar in the X, when the speed measurement performed "vskidku" one "shot."
After studying the basic characteristics of radar detectors turn to answer the question whether these devices can help you avoid speeding tickets.
As you know, the traffic police inspector radar emits an electromagnetic signal that is reflected from the body of the car and then taken by radar . If the vehicle is moving , the frequency of the reflected and received signal will be different . The difference in frequency between the start and the reflected radar signals and calculates the speed of the machine .
To determine the reliability of the radar for the experiment were taken four radar detectors from different manufacturers: Russia, costing 890 rubles, two Korean price of 3000 and 7500 rubles, and Chinese for 10,600 rubles. The Russian unit straight receiver, while imports - "super giter 1 (such receivers are more sensitive to random signals)." More sensitive receivers are equipped with a function of «city», which translated to English means the word "city". Activating this function allows you to reduce the sensitivity of the radar-detector elements in the city in order to avoid false alarms, which often come from gas stations, sliding doors of supermarkets and other facilities operating in the same frequency bands as the detectors themselves.
Now, we will identify the quality of the four applicants in combat conditions. As an inspector will provide radar radar "Iskra", which operates in the "C" range with short pulses and determines the rate of three-tenths of a second at a distance of five hundred meters. Russian radar detector found only five hundred meters and a working range of "Iskra". Against it, it is useless, however, as Korean. Against it it worked only when fired at close range, from twenty meters. Ultrashort pulses he catches bad. But Korean rubles for 7000 did not detect any radar. Most traffic police radars operate in the "C" range with different modulation, ie the wavelength and amplitude of the oscillations they are different. Therefore, radar detectors should be specifically optimized for each traffic police radar. Despite the fact that the documentation of the device indicates that it works in the frequency range "K" does not mean that it will identify all the traffic police radar.
Back to our test. The most expensive of the four contenders Chinese radar detector detects the hand-over two kilometers. However, it will help only if the road will be a lot of cars. Now check whether the detectors detect stationary radar "Chris", which is usually mounted on a tripod or suspended above the road. Like the hand-held radar, this instrument has a range of "K", but in offline mode, that is, the speed limit of vehicles they are constantly monitored. But what if the radar is directed to the driver in the back. In this case, unfortunately, determine the location of the radar return will not succeed. Thus, the Russian and the two Korean detector proved futile because of the weak and the receiver misconfigurations. Chinese detector proved to be most effective, but even on an empty track of it good enough.
Thus, in answer to the question how to choose a radar detector, we can recommend primarily observe speed limits, especially in the city, as no radar detector does not give you 100% protection.