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- Loading_coil abstract "In electronics, a loading coil or load coil is an inductor that does not provide coupling to any other circuit, but is inserted in a circuit to increase its inductance. The term originated in the 19th century for inductors used to prevent distortion in submarine telegraph cables. Loading coils are still used in long cables. The term is also used for inductors in antennas, or between the antenna and its feedline, to make an electrically short antenna resonant at its operating frequency. Loading coils are archaically known as Pupin coils after Mihajlo Pupin (especially when used for the Heaviside condition), and the process of inserting them is sometimes called pupinization.The need for loading coils was discovered by Oliver Heaviside in studying the disappointing slow speed of the Transatlantic telegraph cable. He concluded additional inductance was required to prevent amplitude and time delay distortion of the transmitted signal. The mathematical condition for distortionless transmission is known as the Heaviside condition. Previous telegraph lines were overland or shorter, hence had less delay and the need for extra inductance was not so great. Submarine communications cables are particularly subject to the problem, but early 20th century ones using balanced pairs were often continuously loaded with iron wire or tape rather than discretely with loading coils which avoided the sealing problem.".
- Loading_coil thumbnail Small_antenna_loading_coil.jpg?width=300.
- Loading_coil wikiPageExternalLink v=onepage&q&f=true.
- Loading_coil wikiPageExternalLink Telephone_Cables.
- Loading_coil wikiPageID "41326".
- Loading_coil wikiPageRevisionID "606006334".
- Loading_coil align "right".
- Loading_coil direction "horizontal".
- Loading_coil footer "' Toroidal 0.175 H loading coil for an AT&T long distance telephone trunkline from New York to Chicago 1922. Each of the 108 twisted pairs in the cable required a coil. The coils were enclosed in an oil-filled steel tank ' on the telephone pole. The cable required loading coils every 6000 ft .".
- Loading_coil hasPhotoCollection Loading_coil.
- Loading_coil image "Telephone loading coils 1922.jpg".
- Loading_coil image "Toroidal telephone loading coil.jpg".
- Loading_coil width "140".
- Loading_coil width "170".
- Loading_coil subject Category:Communication_circuits.
- Loading_coil subject Category:Electromagnetic_coils.
- Loading_coil subject Category:History_of_electronic_engineering.
- Loading_coil subject Category:Telecommunications_engineering.
- Loading_coil subject Category:Telecommunications_equipment.
- Loading_coil subject Category:Telephony_equipment.
- Loading_coil type Artifact100021939.
- Loading_coil type Coil103065424.
- Loading_coil type ElectromagneticCoils.
- Loading_coil type Object100002684.
- Loading_coil type PhysicalEntity100001930.
- Loading_coil type Structure104341686.
- Loading_coil type Whole100003553.
- Loading_coil type YagoGeoEntity.
- Loading_coil type YagoPermanentlyLocatedEntity.
- Loading_coil comment "In electronics, a loading coil or load coil is an inductor that does not provide coupling to any other circuit, but is inserted in a circuit to increase its inductance. The term originated in the 19th century for inductors used to prevent distortion in submarine telegraph cables. Loading coils are still used in long cables. The term is also used for inductors in antennas, or between the antenna and its feedline, to make an electrically short antenna resonant at its operating frequency.".
- Loading_coil label "Bespulte Leitung".
- Loading_coil label "Bobina de Pupin".
- Loading_coil label "Cewka Pupina".
- Loading_coil label "Loading coil".
- Loading_coil label "Катушка Пупина".
- Loading_coil sameAs Bespulte_Leitung.
- Loading_coil sameAs Bobina_de_Pupin.
- Loading_coil sameAs Cewka_Pupina.
- Loading_coil sameAs m.0bbkm.
- Loading_coil sameAs Q830044.
- Loading_coil sameAs Q830044.
- Loading_coil sameAs Loading_coil.
- Loading_coil wasDerivedFrom Loading_coil?oldid=606006334.
- Loading_coil depiction Small_antenna_loading_coil.jpg.
- Loading_coil isPrimaryTopicOf Loading_coil.