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A radio transmitter is a device that oscillates an electrical current so the voltage goes up and down at a certain frequency. This electricity generates electromagnetic energy, and when the current is oscillated, the energy travels through the air as an electromagnetic wave. A transmitter also has an amplifier that increases the intensity of the electromagnetic energy and an antenna that broadcasts it into the air.

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A radio receiver is just the reverse of the transmitter: It picks up electromagnetic waves with an antenna and converts them back into an electrical current. At its heart, this is all radio is — the transmission of electromagnetic waves through space. The simplest function of radar is to tell you how far away an object is.

To do this, the radar device emits a concentrated radio wave and listens for any echo. If there is an object in the path of the radio wave, it will reflect some of the electromagnetic energy, and the radio wave will bounce back to the radar device.

Velocity Speed Gun

Radio waves move through the air at a constant speed, so the radar device can calculate how far away the object is based on how long it takes the radio signal to return. Radar measures the speed of an object, due to a phenomenon called Doppler shift.

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Like sound waves, radio waves have a certain frequency, the number of oscillations per unit of time. When the radar gun and the car are both standing still, the echo will have the same wave frequency as the original signal. Each part of the signal is reflected when it reaches the car, mirroring the original signal exactly.

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Laser Speed Guns | Bushnell

But when the car is moving, each part of the radio signal is reflected at a different point in space, which changes the wave pattern. When the car is moving away from the radar gun, the second segment of the signal has to travel a greater distance to reach the car than the first segment of the signal.

If the car is moving toward the radar gun, the second segment of the wave travels a shorter distance than the first segment before being reflected. As a result, the peaks and valleys of the wave get squeezed together: The frequency increases.

The Radar Gun Revolution

Available for either hire or sale, the user simply points the speed radar gun at traffic and the speed will show up on the LCD display fitted on the rear of the PR for the user to read. The PR will measure approaching vehicle speeds of mph at up to ft away from the user. Therefore making it one of the safest models available and the most popular choice for monitoring roadside speeds with community speed watch groups. The Pocket Radar PR is ideally suited due to it's low price point and simplicity of use.

It has a recall button to show the previous 10 speed captured for data recording purposes. Buy Now.

Our LidarCam combines a certified radar module and a high resolution 18 mega-pixel Sony camera sensor to capture speeding vehicles with photographic evidence. Each captured image shows a time, date speed and GPS location for further action. The user can quickly set up the speed camera device and leave running continuously for up to 16 hours on the inbuilt rechargeable batteries.

Used widely across the US by local authorities and police forces, the LidarCam is available to purchase or hire from Roadside Technologies Ltd. Renowned as one of the safest models available, the user can safely stand on a pavement and capture approaching vehicles at up to m away. Every year, about 1. Speed is a contributing factor in around half of fatal road collisions, according to the Metropolitan Police. And the faster a vehicle travels, the worse injuries will be.

Current deterrents for motorists are flawed.

In Pa., local cops can’t use radar to catch speeders. That could soon change

Speed cameras create resentment and only work in specific locations. Police with speed guns are effective, but this approach can be a drain on their time.

Custom Speed Pitch Cage With SR3600 Radar Gun & Display Package

There is a crucial difference when volunteers, like John, rather than the police, wield speed guns. Motorists who are caught simply receive a warning letter from the police telling them that neighbourhood volunteers have recorded them speeding. The letter contains an educational message and an appeal to their conscience - but no other penalty, no points or fine.

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However, if they receive three of these letters, they may get a home visit from a police officer and their vehicle details could be put on a police database. A study it conducted in Aylmer Road, in Barnet, north London, suggested that volunteers working for a year were able to bring down the average speed by 11mph, to 31mph - below the 40mph limit.

Daniel, a Londoner, says it can. The fact that there was no fine or penalty, he says, removed any anger or frustration.

This allowed him to focus on the fact he was in the wrong. One of the first forces to start working with volunteers was Cheshire Police in the mids.