Radar Detectors FOR AUSTRALIA.
What are radar detectors?
Radar detectors, sometimes called a fuzz buster, is an electronic device used by motorists to determine if their speed is being monitored by a radar unit. To do so, police bounce a radio wave off of a moving vehicle with a radar gun or other radar device that determines the vehicle's speed by the Doppler-effect-moderated change in the wave's frequency. Most of today's radar detectors detect signals across a variety of wavelength bands – usually X, K and Ka (as well as Ku, in Europe, also recently approved for use in the U.S).
These devices should not be confused with LIDAR detectors and jammers, or GPS-based warning systems that use a speed camera Point of Interest database to warn a driver who is approaching a speed camera location.
Newer speed detection devices use pulsed laser light, commonly referred to as LIDAR, rather than radio waves. Modern radar detectors have been modified to alert to the infrared light emitted by such LIDAR guns. LIDAR detection, however, is not nearly as effective as radar detection because the output beam is very focused. While radar's radio waves can expand to 85 feet across at 1000 feet from their source, LIDAR's light beam expands to only about 6 feet. Also, a police officer targeting a car will most likely aim for the centre mass or headlight of the vehicle and, because radar detectors are mounted on the windshield away from the beam's aim, they may not alert at all. Lastly, with such a focused beam, an officer using a LIDAR gun can target a single car in close proximity to others at ranges of up to 3000 feet.
Despite the advent of LIDAR speed detection, radar remains more prevalent because of its lower price relative to LIDAR equipment and the amount of radar equipment already in service. A severe limitation of LIDAR is that it cannot be used while the police car is in motion, because it requires the operator to actively target each target vehicle whereas traditional radar can be operated while the police officer is driving his car. Popularity of LIDAR speed detection is on the rise, though, as costs decline, ease of operability approaches radar, and existing radar equipment reaches its end-of-service life and is rotated out of service.
Popular radar detector brands include Beltronics, Cobra, Escort, K40, Valentine One, and Whistler.
Although some companies advertise that their radar detectors can 'scramble' or 'absorb' radar and LIDAR (such as Rocky Mountain Radar), many or all of their products do not affect radar and laser equipment due to the low power intake from the device versus the high power that bounces off a vehicle.
In the USA, it is illegal to sell or possess any such products that do transmit radar signals intended to jam radar equipment. Actively transmitting on an FCC licensed frequency without a license is a violation of FCC regulations and a felony. LIDAR jammers are legal in most states and are regulated, much like police LIDAR guns, by the FCC as Class I laser devices.
Legality of Radar Detectors
In some countries and areas, such as those listed below, using or possessing a radar detector is illegal and may result in fines, seizure of the device, or both. These prohibitions generally are introduced under the premise that a driver who uses a radar detector will pose a greater risk of accident than a driver who does not. However, some research has found that the opposite is true. The 2001 Mori report suggests that radar detector users posed a 28% less risk of accident.
Australia: All states besides Western Australia. They are illegal to sell, purchase or possess in SA, NSW, ACT and Victoria. Radar Detectors are illegal to use in NT, Queensland and Tasmania.
RDDs - Radar Detector Detectors
RADAR detectors are built around a superheterodyne receiver, which has a local oscillator that radiates slightly, so it is possible to build a radar-detector detector, which detects such emissions (usually the frequency of the radar type being detected, plus about 10 MHz). The VG-2 Interceptor was the first device developed for this purpose, but has since been eclipsed by the Spectre III.  This form of "electronic warfare" cuts both ways - since detector-detectors use a similar superheterodyne receiver, many early "stealth" radar detectors were equipped with a radar-detector-detector-detector circuit, which shuts down the main radar receiver when the detector-detector's signal is sensed, thus preventing detection by such equipment. This technique borrows from ELINT surveillance countermeasures. In the early 1990s, BEL-Tronics, Inc. of Ontario, Canada (where radar detector use is prohibited) found that the local oscillator frequency of the detector could be altered to be out of the range of the VG-2 Interceptor. This resulted in detector manufacturers responding by changing their local oscillator frequency. Today, practically every radar detector on the market is immune to the VG-2 Interceptor. To date, the only radar detector that has been proven to be immune to all RDDs is the Beltronics STi Driver.
A HISTORY OF RADAR DETECTORS
The history of the radar detector can't be examined without first delving into the evolution of radar technology. Radar has been used in object detection since the early twentieth century. Harnessing the capability to assess the speed of cars was a natural evolution in the use of radar. Motorist frustration at this high-tech invisible detection led to the invention of a device that could alert the driver to speed traps that used radar.
History of Radar
Electromagnetic waves can be detected using radar. The name evolved in 1941 as an acronym that stood for “Radio Detection And Ranging.” Essentially, a radar transmitter emits radio waves. The waves travel at a fixed rate through the air until they strike a target. The waves are then bounced or reflected back from the target to a radar receiver, where it shows the location and speed of the object. Radar was originally developed by the military, but today it has many peacetime uses, including meteorology, air traffic control and oceanography.
Police Radar Guns
Radar guns emerged in the 1950s. Used by police to monitor highway speeds, a police radar can accurately report the speed of a vehicle by measuring the time it takes for the radar signal to bounce off your car and return to the radar gun. Since radar results are admissible in court and very difficult to challenge, the radar gun became the tool of choice for police across the country. Motorists quickly grew frustrated at the presence of radar speed traps and the difficulty in challenging speeding tickets.
The Radar Detector
In the early 1970s, one frustrated motorist, Dale Smith of Dayton, Ohio, invented a device that would give drivers an alert if any radar systems were targeting their vehicle. He came up with the auto radar detector after getting a speeding ticket he felt was unfair. The first device, called a Fuzzbuster, detected radio signals sent out on the band of police radar guns. It gave off a high-pitched sound and lit up when these waves were detected. Smith started his own company to manufacture radar detectors, and the electronic devices were a huge hit.
In the late 1970s, speed limits all over the nation were lowered in an effort to conserve fuel, sometimes by as much as 15 miles per hour. Motorists were frustrated enough that speeding without being detected was an extremely enticing option. The radar detection industry exploded, with technological advances that now detect other forms of police speed detection devices. These are often marketed as radar detector scramblers that contort the readings of the radar receivers. Many radar detectors now also combat lasers, the newest way that police try to determine vehicle speed.