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The Whistler Group was an electronics company based in Bentonville, Arkansas, [1] best known for its radar detectors. Whistler also manufactured power inverters, GPS navigation devices, inspection cameras, LED flashlights, vehicle dashboard cameras, and scanner radios. [2] The company went out of business in 2024 without warning.
An early radar detector Car radar detector (Japanese) A radar detector is an electronic device used by motorists to detect if their speed is being monitored by police or law enforcement using a radar gun. Most radar detectors are used so the driver can reduce the car's speed before being ticketed for speeding.
A radar detector detector (RDD) is a device used by police or law enforcement in areas where radar detectors are declared illegal. Radar detectors are built around a superheterodyne receiver, which has a local oscillator that radiates slightly. It is therefore possible to build a radar-detector detector, which detects such emissions (usually ...
The first computerized detectors had lights indicating the nature of defect and a numeric display of the associated axle number. Seaboard Air Line was the first railroad to install defect detectors which "spoke" their results over radios carried by train crew starting around 1960, with the first being installed in Riceboro, Georgia , on their ...
Detector-Tracker Group, Data Processing and Display Subsystem, part of AN/GPA-73 Radar Course Directing Group air defense command, control, and coordination system: Air Defense Command: AN/FSA-21: Weapons Control Group computer, part of AN/GPA-73 Radar Course Directing Group air defense command, control, and coordination system: Air Defense ...
As a part of this development, he formulated the first – at least in Britain – mathematical relationship that would later become well known as the "radar range equation". By May 1939, the CD RDF could detect aircraft flying as low as 500 feet (150 m) and at a range of 25 mi (40 km).
MADRE over-the-horizon radar at the NRL's Chesapeake Bay Detachment U.S. Navy Relocatable Over-the-Horizon Radar station. The most common type of OTH radar, OTH-B (backscatter), [3] uses skywave or "skip" propagation, in which shortwave radio waves are refracted off an ionized layer in the atmosphere, the ionosphere, and return to Earth some distance away.
An IRST sensor on a Sukhoi Su-35. An Infrared Search and Track (IRST) system (sometimes known as infrared sighting and tracking) is a method for detecting and tracking objects which give off infrared radiation, such as the infrared signatures of jet aircraft and helicopters.
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