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Electroldetc
 

 

 

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Français : Circuit du poste à détecteur électrolytique. Dès le début du XXe siècle. Une pile, un potentiomètre et un écouteur applique une tension au détecteur électrolytique. La polarisation électrolytique de l'anode est très rapide. L'anode est un fil de platine très fin de 1/100 de millimètre. Le signal alternatif du circuit inductance-condensateur dépolarise partiellement l'anode aux rythmes de la modulation d'amplitude, ce qui oblige la pile à fournir un nouveau courant pour repolariser l'anode. L'écouteur parcouru par ce courant repolarisant aux rythmes de la modulation d'amplitude et fait entendre une image de la modulation. ( La cathode est une plaque ou un gros fil de platine ou de plomb ). Le détecteur électrolytique fonctionne avec l'application d'une source auxiliaire bien déterminée entre 1,5 volt à 2,5 volts pour la fonction détectrice cathode anode. Pour le réglage du détecteur électrolytique, mètre la tension de la source auxiliaire au maximum environ: 2,5 volts. Dès que l'électrolyse de l'eau bouillonne, un bruit et perçu dans l’écouteur, réduire lentement la tension jusqu’à la disparition complète de tout bruit. Puis Connecter l’antenne. Refaire le réglage régulièrement et en cas de changement de température, en cas de changement de pression barométrique, en cas d’une vibration, en cas de choc…. Le détecteur électrolytique à une sensibilité de 7 nanowatts. Le détecteur électrolytique est seulement utilisable dans les stations fixes, instable aux vibrations, aux mouvements. Donc inutilisable dans les stations radios mobiles : navires, aéronefs, ballons dirigeables, stations portables... Ce détecteur a été utilisé dans les récepteurs pour un usage à court terme en raison de son de la complexcité de l'entretien.
English: Circuit of an early radio receiver with electrolytic detector, from the very start of the 20th century. A battery and potentiometer apply a small bias voltage to the electrolytic detector. The electrolytic polarization of the anode is very fast. The anode is a very fine platinum wire 1/100 of millimetre in diameter, while the cathode is a lead or platinum plate or large wire. The alternating signal from the tuned circuit partially depolarizes the anode in response to the amplitude modulation, which draws a DC current from the battery which varies with the modulation, to repolarise the anode. This current passes through the earphone, which converts the audio current to sound. The electrolytic detector functions with a bias voltage of between 1.5 and 2.5 volts. To adjust it, the bias voltage is first adjustad to maximum, 2.5 volts. As soon as water bubbles indicate that electrolysis is occurring, and a noise is heard in the earphone, the bias voltage is slowly turned down until the noise completely disappears. Then the antenna is connected. The detector must be readjusted in the event of a change of temperature, barometric pressure, vibration, or shock. The electrolytic detector has a sensitivity of 7 nanowatts. It is unstable when subjected to movement or vibration, so it is only usable in fixed stations, not in portable or mobile radios, ships, aircraft, or airships. It was only used in early receivers for a short time due to its complexity of maintenance.
Date 23 March 2006(2006-03-23)
Source http://en.wikipedia.org/wiki/File:Electroldetc.jpg
Author F1jmm

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