EP0036627A1 - Galvanische Entkupplungsvorrichtung für ein Fernsehantennen- oder Fernsehfernverteilungskabel - Google Patents

Galvanische Entkupplungsvorrichtung für ein Fernsehantennen- oder Fernsehfernverteilungskabel Download PDF

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Publication number
EP0036627A1
EP0036627A1 EP81102010A EP81102010A EP0036627A1 EP 0036627 A1 EP0036627 A1 EP 0036627A1 EP 81102010 A EP81102010 A EP 81102010A EP 81102010 A EP81102010 A EP 81102010A EP 0036627 A1 EP0036627 A1 EP 0036627A1
Authority
EP
European Patent Office
Prior art keywords
connector
cable
conductor
sheath
interrupted
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP81102010A
Other languages
English (en)
French (fr)
Inventor
Guy Perrot
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cables de Lyon SA
Original Assignee
Cables de Lyon SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cables de Lyon SA filed Critical Cables de Lyon SA
Publication of EP0036627A1 publication Critical patent/EP0036627A1/de
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R24/00—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure
    • H01R24/38—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts
    • H01R24/40—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts specially adapted for high frequency
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R2103/00—Two poles

Definitions

  • the present invention relates to a device for galvanically decoupling a cable from a television antenna or from a cable television distribution system at its junction with a connection connector of the television receiver.
  • Television receivers are generally connected by coaxial cables to external antennas placed on the roofs of buildings so as to present an effective height as large as possible to capture the maximum of electromagnetic field and to escape the ambient parasitic signals. In collective buildings these antennas may be common to a greater or lesser number of users.
  • many television receivers are for reasons of economy lacking an isolation transformer between the 50 or 60 Hz supply network and the receiver supply circuits.
  • the rectifiers supplying the DC voltages necessary for the operation of the receiver are connected to one pole of the network and the other pole is connected to the metal part of the chassis or "ground" of the receiver, so that this ground can be brought to a potential. several hundred volts AC to earth.
  • the antenna connection cable is therefore also brought to the network potential, either by its external conductor (which is generally a metallic braid), or even by the internal and external conductors of the connection cable, despite the presence decoupling capacitors whose efficacy is generally questionable.
  • this cable includes remote-powered repeaters supplied with direct current. A fault in either of these repeaters can lead to the passage of direct current through one or other of the cable conductors.
  • the aim of the present invention is to remedy these drawbacks by ensuring effective galvanic decoupling of the antenna or cable cable by blocking the passage of the component at 50 Hz (or 60 Hz) from the supply network, or else a direct current coming from a repeater, without presenting any notable obstacle to the passage of the high frequency currents coming from the antenna or the distribution circuit, and by further introducing an effective filtering of these high frequency currents by limiting their band transmitted to that of the reception channels actually used, which eliminates a large part of the high frequency spurious signals due to the ignition of automobiles, electrical equipment or trolleybus traction lines in particular.
  • the device according to the invention is characterized in that the external conductor of the antenna cable is interrupted near the connector, in that the sheath of dielectric material of the cable is interrupted at a slightly shorter distance from the connector than said conductor , and in that a conductor element concentric with said sheath around it surrounds the end of the outer conductor of the cable over a length equal to a quarter of the average length of the waves to be transmitted in the dielectric of the sheath in the vicinity of the central frequency of the television channels to be received, then connects to the external conductive part of the connector.
  • the braid 12 constituting the outer conductor of the cable 11 for connecting the television to the antenna is interrupted a few centimeters before the entry of this cable into the connector connecting to the receiver.
  • the insulating sheath 13 of this cable is extended from a few millimeters to a maximum of one centimeter over the braid to allow the latter to be isolated. This operation is generally quite easy, because it is possible to slide the sheath over the braid, cut it and then fold or bring the braid over the sheath.
  • An external metal braid 14 is then fitted over the end of the cable sheath which will ensure the high frequency connection of the cable with the external part of the connection connector.
  • the length of the outer braid covering the end portion of the inner braid 12 through the sheath 13 is chosen to be substantially equal to a quarter wavelength in the dielectric of the sheath in the vicinity of the central frequency of the television channels to be received, so that the high frequency currents pass without difficulty from the braid 12 to the braid 14 to enter the receiver through the external conductive part 15A of the connector 15, the low coupling admittance at the start being transformed into high admittance by the quarter wave coupling, while the presence of the insulating sheath 13 between the two concentric braids 12 and 14 prohibit any passage of current at industrial frequency (or even of possible direct current) from the chassis of the television through the antenna cable.
  • the coupling length of the two braids is tuned to a quarter wave only for the central frequency of the desired channels, the high parasitic frequencies are greatly attenuated, which can greatly improve reception.
  • this device also blocked the passage of direct currents, it can be used on cable television installations where the connection cables include remote powered repeaters, so that the risks due to remote power currents are also deleted.
  • the inner conductor 16 and the insulator 17 are not modified.
  • the external braid 14 of FIG. 1 can itself be protected by a second external insulating sheath 18 concentric with this braid, although this is not strictly necessary, before entering the connector 15.
  • FIG. 2 represents the case where decoupling is also applied to the inner conductor of the connecting cable 21.
  • the braid 22 forming an external conductor is cut and covered over a quarter wavelength by an external braid 24.
  • the latter is protected by a second external insulating sheath 28.
  • the inner conductor 26 of this cable is also cut a few centimeters before entering the connector and its end is covered with an insulating sleeve 30 over a length substantially greater than a quarter wavelength in the insulator at the average frequency of the channels to be transmitted.
  • a braid 31 is then slid over the sleeve 30 so as to cover the latter over a length equal to * n quarter wavelength above the end of the inner conductor on the antenna side, then is connected by a solder 32 at the other end (after interruption) 29 of the internal conductor on the connector side (and receiver), itself connected to the internal conductive part 29A of the connector.
  • the galvanic decoupling of the antenna connection cable is ensured for the two concentric conductors without the possibility of passing network currents or remote supply currents (in the case of cable television), and the filtering efficiency of high frequency stray currents is further improved.
  • the metallic braids ensuring the coupling for the high frequency currents on the outside and inside conductors can be replaced by solid strips.

Landscapes

  • Coupling Device And Connection With Printed Circuit (AREA)
  • Multi-Conductor Connections (AREA)
  • Waveguides (AREA)
EP81102010A 1980-03-25 1981-03-18 Galvanische Entkupplungsvorrichtung für ein Fernsehantennen- oder Fernsehfernverteilungskabel Ceased EP0036627A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8006591A FR2479576A1 (fr) 1980-03-25 1980-03-25 Dispositif de decouplage galvanique d'un cable d'antenne de television ou de telealimentation
FR8006591 1980-03-25

Publications (1)

Publication Number Publication Date
EP0036627A1 true EP0036627A1 (de) 1981-09-30

Family

ID=9240067

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81102010A Ceased EP0036627A1 (de) 1980-03-25 1981-03-18 Galvanische Entkupplungsvorrichtung für ein Fernsehantennen- oder Fernsehfernverteilungskabel

Country Status (3)

Country Link
EP (1) EP0036627A1 (de)
JP (1) JPS56149781A (de)
FR (1) FR2479576A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0142050A2 (de) * 1983-10-14 1985-05-22 Audioplan, Renate Kühn Signalkabel

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2401344A (en) * 1940-06-14 1946-06-04 Gen Electric Co Ltd High-frequency electric transmission system
US3309632A (en) * 1965-04-13 1967-03-14 Kollmorgen Corp Microwave contactless coaxial connector
US3364457A (en) * 1966-05-13 1968-01-16 Navy Usa Electrical adapter
US3393384A (en) * 1964-08-28 1968-07-16 Nasa Usa Radio frequency coaxial high pass filter
BE844001A (fr) * 1975-07-09 1976-11-03 Filtre pour ligne de transmission

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2401344A (en) * 1940-06-14 1946-06-04 Gen Electric Co Ltd High-frequency electric transmission system
US3393384A (en) * 1964-08-28 1968-07-16 Nasa Usa Radio frequency coaxial high pass filter
US3309632A (en) * 1965-04-13 1967-03-14 Kollmorgen Corp Microwave contactless coaxial connector
US3364457A (en) * 1966-05-13 1968-01-16 Navy Usa Electrical adapter
BE844001A (fr) * 1975-07-09 1976-11-03 Filtre pour ligne de transmission
US4004257A (en) * 1975-07-09 1977-01-18 Vitek Electronics, Inc. Transmission line filter
CH611745A5 (de) * 1975-07-09 1979-06-15 Vitek Electronics Inc

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0142050A2 (de) * 1983-10-14 1985-05-22 Audioplan, Renate Kühn Signalkabel
EP0142050A3 (en) * 1983-10-14 1986-08-13 Audioplan, Renate Kuhn Signal transmission cable

Also Published As

Publication number Publication date
FR2479576B1 (de) 1984-08-03
JPS56149781A (en) 1981-11-19
FR2479576A1 (fr) 1981-10-02

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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17P Request for examination filed

Effective date: 19820316

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18R Application refused

Effective date: 19831017

RIN1 Information on inventor provided before grant (corrected)

Inventor name: PERROT, GUY