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Qu'est-ce (qui) est NAB Crystal Radio Awards - définition
NAB Crystal Radio Awards
The NAB Crystal Radio Awards are presented annually by the National Association of Broadcasters to American radio stations. The award was established in 1987 to recognize radio stations for year-round commitment to community service.
NAB Marconi Radio Awards
PRESENTED TO TOP RADIO BROADCASTERS AND STATIONS
Marconi Award; NAB Marconi Radio Award
The Marconi Radio Awards are presented annually by the National Association of Broadcasters (NAB) to the top radio stations and on-air personalities in the United States. The awards are named in honor of Guglielmo Marconi, the man generally credited as the "father of wireless telegraphy".
Crystal radio
![amplitude modulated]] radio signal from the tuned circuit. The rapid oscillations are the [[radio frequency]] [[carrier wave]]. The [[audio signal]] (the sound) is contained in the slow variations ([[modulation]]) of the amplitude (hence the term amplitude modulation, AM) of the waves. This signal cannot be converted to sound by the earphone, because the audio excursions are the same on both sides of the axis, averaging out to zero, which would result in no net motion of the earphone's diaphragm. ''<span style="color:red;">(B)</span>'' The crystal conducts current better in one direction than the other, producing a signal whose amplitude does not average to zero but varies with the audio signal. ''<span style="color:red;">(C)</span>'' A bypass capacitor is used to remove the radio frequency carrier pulses, leaving the audio signal](https://commons.wikimedia.org/wiki/Special:FilePath/Amplitude modulation detection.png?width=200 "amplitude modulated]] radio signal from the tuned circuit. The rapid oscillations are the [[radio frequency]] [[carrier wave]]. The [[audio signal]] (the sound) is contained in the slow variations ([[modulation]]) of the amplitude (hence the term amplitude modulation, AM) of the waves. This signal cannot be converted to sound by the earphone, because the audio excursions are the same on both sides of the axis, averaging out to zero, which would result in no net motion of the earphone's diaphragm. ''<span style=\"color:red;\">(B)</span>'' The crystal conducts current better in one direction than the other, producing a signal whose amplitude does not average to zero but varies with the audio signal. ''<span style=\"color:red;\">(C)</span>'' A bypass capacitor is used to remove the radio frequency carrier pulses, leaving the audio signal")
![Pictorial diagram from 1922 showing the circuit of a crystal radio. This common circuit did not use a tuning [[capacitor]], but used the capacitance of the antenna to form the [[tuned circuit]] with the coil. The detector was a [[cat whisker detector]], consisting of a piece of galena with a thin wire in contact with it on a part of the crystal, making a diode contact](https://commons.wikimedia.org/wiki/Special:FilePath/CrystalRadio.jpg?width=200 "Pictorial diagram from 1922 showing the circuit of a crystal radio. This common circuit did not use a tuning [[capacitor]], but used the capacitance of the antenna to form the [[tuned circuit]] with the coil. The detector was a [[cat whisker detector]], consisting of a piece of galena with a thin wire in contact with it on a part of the crystal, making a diode contact")
![Crystal radio used as a backup receiver on a World War II [[Liberty ship]]](https://commons.wikimedia.org/wiki/Special:FilePath/Crystal radio backup on SS Jeremiah O'Brien.agr.jpg?width=200 "Crystal radio used as a backup receiver on a World War II [[Liberty ship]]")
![[[Germanium diode]] used in modern crystal radios (about 3 mm long)](https://commons.wikimedia.org/wiki/Special:FilePath/Germanium Diode 1N60.jpg?width=200 "[[Germanium diode]] used in modern crystal radios (about 3 mm long)")
.jpg?width=200 "Galena crystal detector")
![piezoelectric earphone]]](https://commons.wikimedia.org/wiki/Special:FilePath/Poste a diode 1.JPG?width=200 "piezoelectric earphone]]")
![Crystal radio (1915) kept at the Museum of the radio - [[Monteceneri]] (Switzerland)](https://commons.wikimedia.org/wiki/Special:FilePath/Radio Galena Museo della radio 2.jpg?width=200 "Crystal radio (1915) kept at the Museum of the radio - [[Monteceneri]] (Switzerland)")
![The earliest crystal receiver circuit did not have a [[tuned circuit]]](https://commons.wikimedia.org/wiki/Special:FilePath/Simplest crystal radio circuit.svg?width=200 "The earliest crystal receiver circuit did not have a [[tuned circuit]]")
![Arrow]] crystal radio marketed to children. The earphone is on left. The antenna wire, right, has a clip to attach to metal objects such as a bedspring, which serve as an additional antenna to improve reception.](https://commons.wikimedia.org/wiki/Special:FilePath/Vintage Arrow Germanium Crystal Radio (23708349181).jpg?width=200 "Arrow]] crystal radio marketed to children. The earphone is on left. The antenna wire, right, has a clip to attach to metal objects such as a bedspring, which serve as an additional antenna to improve reception.")
SIMPLE RADIO RECEIVER CIRCUIT USED MOSTLY FOR AM RECEPTION
Crystal set; Diode detector; Crystal sets; Crystal Radio; Crystal radio receiver; Crystadine; Crystodine; Crystal receiver
A crystal radio receiver, also called a crystal set, is a simple radio receiver, popular in the early days of radio. It uses only the power of the received radio signal to produce sound, needing no external power.
