In radio, a detector is a device or circuit that extracts information from a modulated radio frequency current or voltage. The term dates from the first...

A crystal detector is an obsolete electronic component used in some early 20th century radio receivers that consists of a piece of crystalline mineral...

the received radio signal to produce sound, needing no external power. It is named for its most important component, a crystal detector, originally made...

higher radio frequency signal level than the plate detector. Diode detectors also became popular during the later 1920s because, unlike plate detector circuits...

also refer to: Detector (radio), a device that recovers information from a modulated wave Detector (film), a 2000 Norwegian film USS Detector, two United...

a rectifying detector such as a crystal detector or electrolytic detector, along with the radio signal from the antenna. In the detector the two signals...

electrolytic detector, or liquid barretter, was a type of detector (demodulator) used in early radio receivers. First used by Canadian radio researcher...

presence or absence of the radio signal, and produce a click sound. The device that did this was called a detector. The first detectors were coherers, simple...

The past success of radar detectors was based on the fact that radio-wave beams can not be narrow-enough, so the detector usually senses stray and scattered...

Pacific theaters. The foxhole radio was a crude crystal radio which used a safety razor blade as a radio wave detector with the blade acting as the crystal...

A motion detector is an electrical device that utilizes a sensor to detect nearby motion (motion detection). Such a device is often integrated as a component...

The Antarctic Muon And Neutrino Detector Array (AMANDA) is a neutrino telescope located beneath the Amundsen–Scott South Pole Station. In 2005, after nine...

neutrino detectors must be very large to detect a significant number of neutrinos. Neutrino detectors are often built underground, to isolate the detector from...

original signal. A simple form of envelope detector used in detectors for early radios is the diode detector. Its output approximates a voltage-shifted...

A metal detector is an instrument that detects the nearby presence of metal. Metal detectors are useful for finding metal objects on the surface, underground...

TV detector vans are vans which contain equipment that can detect the presence of television sets in use. These vans have been used by the General Post...

lectures Lodge demonstrated a detector that would become standard in radio work, an improved version of Branly's detector which Lodge dubbed the coherer...

magnetic detector or Marconi magnetic detector, sometimes called the "Maggie", was an early radio wave detector used in some of the first radio receivers...

A quasi-peak detector is a type of electronic detector or rectifier. Quasi-peak detectors for specific purposes have usually been standardized with mathematically...

Plate detector may refer to: Plate detector (radio), in electronics, used to demodulate amplitude modulated carrier signal Microchannel plate detector, used...

Diode Detector Radio EX-30 EX-15 + EX-A morse key block, short cables Morse Code Practice Circuit EX-60 EX-30 + EX-B IC Amplifier I-Diode Detector + IC...

of radio signal detector used in the first radio receivers during the wireless telegraphy era at the beginning of the 20th century. Its use in radio was...

A smoke detector is a device that senses smoke, typically as an indicator of fire. Smoke detectors/Alarms are usually housed in plastic enclosures, typically...

as the detector (demodulator) in the first vacuum tube radio receivers until the 1930s. Early applications of triode tubes (Audions) as detectors usually...

ratio detector is a type of detector circuit, commonly used in radio receivers for demodulating frequency modulated (FM) signal. The ratio detector is a...

Common Pipistrelle Common Pipistrelle call heard on a heterodyne bat detector - 68 KB. This is a typical echolocation call with "feeding buzzes" when it...

hear a sound. The direct-conversion (heterodyne) detector was invented to make continuous wave radio-frequency signals audible. The "heterodyne" or "beat"...

X-ray detectors are devices used to measure the flux, spatial distribution, spectrum, and/or other properties of X-rays. Detectors can be divided into...

Precipitating Electron Detector Radio Doppler System Radio Range/Rate System SECOR Range Transponder Non-geodetic systems included a laser detector and a Minitrack...

Alexander Stepanovich Popov. It was also the first radio receiver in the world. Ground-based and mobile detectors calculate the direction and severity of lightning...