radio set - definizione. Che cos'è radio set
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  3. radio set

Cosa (chi) è radio set - definizione

VINTAGE TELECOMMUNICATION AUDIO RECEIVER
Antique Radios; Old radios; Old Radio; Vintage Radio; Vintage Radios; Radio set
  • regenerative radio]]

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
  • Circuit diagram of a simple crystal radio.
  • 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
  • A family listening to a crystal radio in the 1920s
  • Crystal radio used as a backup receiver on a World War II [[Liberty ship]]
  • Circuit with detector bias battery to improve sensitivity and buzzer to aid in adjustment of the cat whisker
  • Block diagram of a crystal radio receiver
  • Amateur-built crystal receiver with "loose coupler" antenna transformer, Belfast, around 1914
  • Direct-coupled circuit with taps for impedance matching<ref name="Klase" />
  • "Foxhole radio" used on the Italian Front in World War 2. It uses a pencil lead attached to a safety pin pressing against a razor blade for a detector.
  • Greenleaf Whittier Pickard's US Patent 836,531 "Means for receiving intelligence communicated by electric waves" diagram
  • [[Germanium diode]] used in modern crystal radios (about 3 mm long)
  • 1600 ohm magnetic headset.
  • Inductively-coupled circuit with impedance matching. This type was used in most quality crystal receivers in the early 20th century
  • Galena crystal detector
  • publisher =U.S. Government Printing Office}}</ref>
  • piezoelectric earphone]]
  • Crystal radio (1915) kept at the Museum of the radio - [[Monteceneri]] (Switzerland)
  • 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.
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.
https://en.wikipedia.org/wiki/Crystal_radio
crystal set         
  • 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
  • Circuit diagram of a simple crystal radio.
  • 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
  • A family listening to a crystal radio in the 1920s
  • Crystal radio used as a backup receiver on a World War II [[Liberty ship]]
  • Circuit with detector bias battery to improve sensitivity and buzzer to aid in adjustment of the cat whisker
  • Block diagram of a crystal radio receiver
  • Amateur-built crystal receiver with "loose coupler" antenna transformer, Belfast, around 1914
  • Direct-coupled circuit with taps for impedance matching<ref name="Klase" />
  • "Foxhole radio" used on the Italian Front in World War 2. It uses a pencil lead attached to a safety pin pressing against a razor blade for a detector.
  • Greenleaf Whittier Pickard's US Patent 836,531 "Means for receiving intelligence communicated by electric waves" diagram
  • [[Germanium diode]] used in modern crystal radios (about 3 mm long)
  • 1600 ohm magnetic headset.
  • Inductively-coupled circuit with impedance matching. This type was used in most quality crystal receivers in the early 20th century
  • Galena crystal detector
  • publisher =U.S. Government Printing Office}}</ref>
  • piezoelectric earphone]]
  • Crystal radio (1915) kept at the Museum of the radio - [[Monteceneri]] (Switzerland)
  • 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.
SIMPLE RADIO RECEIVER CIRCUIT USED MOSTLY FOR AM RECEPTION
Crystal set; Diode detector; Crystal sets; Crystal Radio; Crystal radio receiver; Crystadine; Crystodine; Crystal receiver
¦ noun a simple early form of radio receiver with a crystal touching a metal wire as the rectifier and lacking an amplifier or loudspeaker, necessitating headphones or an earphone.
Set (mathematics)         
  • The [[natural numbers]] <math>\mathbb{N}</math> are contained in the [[integers]] <math>\mathbb{Z}</math>, which are contained in the [[rational numbers]] <math>\mathbb{Q}</math>, which are contained in the [[real numbers]] <math>\mathbb{R}</math>, which are contained in the [[complex numbers]] <math>\mathbb{C}</math>
  • Passage with a translation of the original set definition of Georg Cantor. The German word ''Menge'' for ''set'' is translated with ''aggregate'' here.
  • ''A'' ∩ ''B''}}</div>
  • ''A'' \ ''B''}}</div>
  • <div class="center">The '''symmetric difference''' of ''A'' and ''B''</div>
  • ''A'' ∪ ''B''}}</div>
  • <div class="center">The '''complement''' of ''A'' in ''U''</div>
  • ''A'' is a subset of ''B''.<br>''B'' is a superset of ''A''.
WELL-DEFINED MATHEMATICAL COLLECTION OF DISTINCT OBJECTS
Set (math); Crisp set; Conventional set; Number sets; Set (mathematical); Mathematical set; Set logic; Basic set operations; Finite subset
A set is the mathematical model for a collection of different things; a set contains elements or members, which can be mathematical objects of any kind: numbers, symbols, points in space, lines, other geometrical shapes, variables, or even other sets. The set with no element is the empty set; a set with a single element is a singleton.
https://en.wikipedia.org/wiki/Set_(mathematics)

Wikipedia

Antique radio

An antique radio is a radio receiving set that is collectible because of its age and rarity.

https://en.wikipedia.org/wiki/Antique radio
Esempi dal corpus di testo per radio set
1. "Eagle one to Eagle eight, can you hear me?" crackles the radio set.
2. The troops recovered an AK rifle, pistol, radio set, Nokia mobiles and arms and ammunition from the possession of the slain militants.
3. "The patrol lost communication with the sector headquarters almost immediately following the destruction of its high frequency radio set," according to the briefing notes.
4. Pinnacle ran ads on Spanish–language television and radio, set up booths at festivals and sponsored soccer matches at George Mason University.
5. Motorists were warned not to leave home unless the journey was "absolutely necessary" and local radio set up a special travel desk.
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