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. 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. To do this, the radar device emits a concentrated radio wave and listens for any echo. The simplest function of radar is to tell you how far away an object is. Radar is the use of radio waves to detect and monitor various objects. At its heart, this is all radio is - the transmission of electromagnetic waves through space. A transmitter also has an amplifier that increases the intensity of the electromagnetic energy and an antenna that broadcasts it into the air.ДЄ 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. This electricity generates electromagnetic energy, and when the current is oscillated, the energy travels through the air as an electromagnetic wave.

A radio transmitter is a device that oscillates an electrical current so the voltage goes up and down at a certain frequency.

The concept of measuring vehicle speed with radar is very simple.ДЄ basic speed gun is just a radio transmitter and receiver combined into one unit. To understand how radar detectors work, you first have to know what theyвЂ™re detecting.

Police handheld radar gun tickey