Tag Archive | "Radio Signals"

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Introduction To Radar Detectors

Posted on 08 September 2008 by admin

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Stefan Rockhaus asked:

A radar detector is an electronic device used by motorists to determine whether their speed is being observed or not by a police officer. The objective of a radar detector is to protect the motorist from getting a speeding ticket from the officer who is using a radar gun.

Radar detectors were introduced in the early 1970’s. The term radar detector originated from technologies that were used earlier to detect speed.

Now the question arises, “What is radar?” Radar is a system used to measure the speed and location of any object. This system consists of two important parts – a transmitter and a receiver. The radio transmitter causes voltage fluctuation by oscillating an electric current at a predefined frequency. This oscillation of the electric field generates electromagnetic energy. This electromagnetic energy propagates in the air as electromagnetic waves. A transmitter consists of an amplifier and an antenna. While the former increases the power of electromagnetic energy, the latter transits it into the air.

The basic function of radar is to determine its distance from the destined object. For this function, the radar device emits concerted radio waves to observe any echo. If any object comes in the way of the radio waves, then it can be easily detected by radar with the help of electromagnetic energy. Radio waves constantly travel in the air at the speed of light. The distance of the object from the radar is determined by observing the time taken by the radio waves to return.

For measuring the actual speed of any object, radar can be used with a fact called Doppler shift. When any moving object passes in front of the radar, its echo will reflect the signals of the radar. The time taken by the radio signals to return after striking the object, and the frequency with which they travel, gives the actual speed of that object. If an object is coming towards the radar, then the signals will come back in a shorter period of time. It will increase the frequency and tells the actual time in which an object will cross the radar. This process depends on how fast the frequency will change. Traffic police use radar in the form of a radar gun, which is either hand-held or vehicle mounted, to detect speeding vehicles.

A basic radar detector detects police radar with just a simple radio receiver. In contrast, detectors that are more sophisticated comprise of a basic receiver along with a radio transmitter. A jamming signal is produced via this transmitter. It blends the signal of the police radar gun with extra radio noise. Due to this, a perplexed echo signal is received by the police radar gun, and the exact speed-reading cannot be taken.

Light-sensitive panels are being used in modern detectors which detect the beams from police laser guns. Lidar is difficult to avoid due to its concentrated beam, so it is quite possible that by the time the detector is able to detect it, the vehicle is in the beam’s sight already. For that, speeders also use a laser jammer. It works much like a radar jammer.

In conclusion, there are several systems available to detect radar, but none of these systems is a sure shot way to get protected against speed detectors. However, one thing that can be done to avoid speeding tickets is to ‘slow down’.

Mike

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8 Must Know Tips Before Buying a Radar Detector

Posted on 13 April 2008 by admin

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Timothy Rudon asked:

Radar detectors are electronic devices designed to detect radio waves. Radar detectors detect radio signals across a range of wavelengths —X, K, Ka and Ku. Radar detectors are used for a variety of purposes across the world. Radar detectors help alert motorists regarding speed traps and radar guns. Radar detectors are also used in tracking, fishing, and exploration.

When buying a radar detector consider:

1. What you are going to use it for? State of the art radar detectors are expensive so you would need to have a clear idea of what you would like to spend.

2. Think about whether you are going to install the radar detector yourself or are you going to have it professionally installed.

3. It is important to choose a radar detector manufactured by a well known electronics company and a radar that can detect a wide range: Ka, K, X, and so on.

4. Try and get a radar detection unit that has a minimum of 100db. Ideally a unit with a memory function is desirable.The more sensitive a radar unit is the more beneficial it will be.

5. Look for a radar unit with a clear display that can be seen at night. Find one that has an adjustable volume as well as mute option.

6. Ask for a long range detector with high sensitivity.

7. Find out what the technical specifications are as well as the pros and cons of the radar detector.

8. Try and get a radar detector model that has a city/ highway mode. This will limit false alarms greatly.

9. Look for radar detectors with extra features like Vg-2 Alert and Vg-2 Non-detection. These features are valuable in states where using radar detectors is illegal.

10. Ask whether the detector has a voice feature this will ensure that the driver is not disturbed.

Radar detectors retail between USD 100-200 . choose a well known brand like BEL, Escort, K40, or Valentine One. They manufacture radar detectors using updated technologies and take market competition seriously.

Radar detectors can be bought retail or online. Online sites sell the best radar detectors at the most affordable rates. You can mount radar detector on the windshield, dash, or visor. If you want a radar detector custom mounted you will have to spend over a 1000 dollars. Experts recommend an easy to remove mounting system so that you can use the same radar detector in different cars.

Take the advice of experts on the best detector to buy and its placement. Electronics are being constantly upgraded so find out aspects like the frequency in your area and the kind of speed detectors that are in use by the police before making a purchase.

Before you invest in a radar detector find out what the laws in your state are.

Mary

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