How to Use a Radar Detector – A Complete Guide for Working of Detectors

radar detector

A radar detector is a device that tells you about the presence of police radar near your car. This amazing device saves you from the penalty while using a high speed.


At this point, here is a need to know how to use a radar detector or how does a radar detector works? Some radar detectors are efficient to an extent of detecting the laser radar. These rays are skipped by the radar detector.

Don’t worry!

Our guide will give a general explanation of the use of every type of detector. Just keep on reading and remove your confusion.

Stop here!

Before knowing about how to use a radar detector you should know first, how does radar work? Let’s move forward.

How do radar works to detect the speed?

The radar releases the radio waves at a specific frequency that has the same speed as that of light. These rays travel towards the car and hit it. At this point, they bounce back towards the radar.

If the targeted vehicle is in motion, then the waves that bounce back have the changed frequency. The car moving towards the police radar reflects back to the higher frequency waves.

On the other hand, when the car is moving away from the police cops, then the reflected rays would have the lowest frequency.

The police compare this difference with the initially emitted signal and determine the car direction and its speed.

How do radar works to detect the distance?

The total time, which the rays take to hit the car and going back to be detected by the radar gives the distance. The difference between the emitted and received rays tells us about the speed of the vehicle.

One point to know,

Only those vehicles which are approaching toward the radar directly show the very accurate reading of speed. But car direction at an angle with the reference to the radar gives the less accurate readings.


It’s time to have an insight into the working of a radar detector. It is easy to understand now because you have the key functioning of the radar.

How to use a radar detector?

We have told you before that radar emits the radio waves of a certain frequency that hits the car in their path.

At this point, the actual game starts.

These rays, in the air, are detected by the detectors present in the car. And you get an alert, in the form of the voice of light, about the presence of radar before coming into the eyes of the police. And the driver readily lowers the car speed.

The more the range of the radio waves, the earlier the detector will give you an alert.

What is the strategy behind it?

You can consider three basic parts of a radar detector. These are:

  • Receiver
  • Processor
  • Detector

The receiver is in the form of antennas that are present on the front and rear sides of detectors. They receive the radio waves and transfer them towards the processor. This part basically analyzes this signal and generates a response.

The response generated is caught by the detector and produce the alerts in the form of sound or light, according to the internal setting.

Types of radar detectors

As stated earlier, radar emits the signals of different frequencies. So the detector, you are using, should have a working range of these frequencies.

These frequencies are available in the form of bands. Each band has its own frequency. The detector can detect only those signals whose matching frequency band is available in the radar detectors.

Typically, radar uses the following frequency bands:

  • Ku band
  • Ka-band
  • K band
  • X band

The Ku-band frequency is the most uncommon one, which has a frequency value of 13.45 GHz.

Ka is not a single frequency band. But it has multiple sub-bands in it. These sub-bands are Ka super wide bands, Ka wide-band, and the Ka-band. Their frequency range is 34.2 to 35.2 GHz.

K-band uses the frequency range of 24.05 GHz to 24.25 GHz. This is the most common band used by the police radar.

Detect the signal from the 2 to 4 miles. This low-frequency X-band makes detection very easy. In addition to police radar, other devices also use this frequency band.

How do laser detectors work?

Let me tell you that the laser radar uses light waves in place of radio waves to detect the speed of the cars. These rays fall in the infrared region; hence, have a more wavelength than that of light.

Police use this type of radars because the light waves are not detected by the typical detectors used by most drivers. With the 905nm wavelength and 30 ns pulse, these rays went undetected in most cases.

In this situation, drivers prefer the laser detector or a detector with a dual function, i.e., laser and radio wave detection.

Disadvantages of the laser detector

From the same initial distance, the beam divergence from the laser radar is fairly less than the typical radar. Due to this reason, some rays went undetected by the radar. Police have to focus on the specific point to collect the reading. This is quite frustrating.

Advanced radar detectors

Due to the multiple uses of the radar detectors, the law administrators have banned the use of radar detectors.

To make it possible, the police have started to use the RDDs (Radar Detector Detectors). This device picks the availability of a radar detector by the emitted oscillations from the device.

Companies have introduced the advanced type of radar detectors on the market that suppresses these oscillations, which make the RDDs working impossible.


Final Verdict

It seems funny that here begins the hide and sick between the police and the drivers.

I don’t know what would be the next strategy of the police and law enforcement. We can just wait and watch where would this game is going to end.

The winner will be law enforcement or the radar detector user. It will be decided by the time.

Radar detectors are amazing, but you should know how to use a radar detector. This will, of course, save you from frustration and let you drive in a very cool and worry-free mood.

We have written this post for you to save your time. If you have thoroughly understood our guide, then this is going to give you 100% favor.

You May Also Like : Best Radar Detector 2021






Leave a Comment