Abstract: A process for obtaining a twisted pair electrical signal cable having conductors of equal physical length and equal signal transmitting properties by passing a parallel pair of adhered insulated conductors of equal length through a closely-fitting die and twisting the conductors into a twisted pair cable. The process applies to thermopolymer insulated and ePTFE insulated conductors.

Abstract: This invention relates to flat cables comprising a plurality of substantially parallel insulated conductors bonded to a polymeric substrate which has a melting point greater than 200.degree. C. and/or a thickness less than 2.5 mils (98 microns) and a method for the production of such cables.

Abstract: In a computer network having a cable for transmission of electrical signals between data terminal equipment and a device used to control and route data in the network, an apparatus for terminating the cable to minimize emissions radiating from the cable and susceptibility of the cable to outside interferences. The cable is comprised of unshielded twisted pairs of wires. Each twisted pair is individually terminated into a matching input impedance. The difference signals being conducted in each twisted pair produces common mode currents which sets up standing waves through the cable. Consequently, at each end of the cable, the common mode of the twisted pairs is terminated into a load having an impedance approximately equal to the common mode impedance of the twisted pairs. These loads effectively dissipate the energy from the standing waves, thereby minimizing emissions. Reciprocally, susceptibility is likewise minimized.

Abstract: Cladding structure, in particular for optical cables (1), for use in high-voltage environments, comprising at least one elongated plastic outer sheath (8), having capacitive elements (C.sub.1, C.sub.2, C.sub.3 . . . C.sub.n) electrically connected in series in the longitudinal direction of the cladding structure. Said capacitive elements are formed by electrodes (5, 7, 9; 10, 11, 12) underneath the outwardly facing side of the outer sheath (8). Said electrodes (5, 7, 9; 10, 11, 12) can be situated in a mutually offset manner in radial and/or longitudinal direction of the cladding structure. Damaging of the cladding structure due to corona discharge or tracking phenomena is effectively reduced by said series connection of capacitive elements (C.sub.1, C.sub.2, C.sub.3 . . . C.sub.n).

Abstract: Methods and apparatus are provided for providing an electrically matched pair (20) of insulated metallic conductors (21, 21). Insulation is applied to successive portions of a length of wire-like metallic conductor (22) after which a colorant material (37) is applied to the surface of a plastic insulation material of a first portion of the length of the metallic conductor which is being moved along a path of travel. Facilities are provided for shielding a supply of the colorant material from the moving insulated metallic conductor and for then exposing a second portion of the length of the insulated metallic conductor to a different colorant material. The insulation and the colorant materials and their disposition with respect to the insulation are such that the dielectric constant of one insulated metallic conductor of the pair is substantially equal to that of the other.

Abstract: The present invention features a new "filter line" cable having a temperature-enhancement jacket layer composed of, in various forms, a Teflon layer or fused Teflon/Kapton layers. The filter line cable has a conductive core having a primary insulation layer. Over the primary insulation is a filtering layer made up, at least in part, of ferromagnetic particles (ferrite or magnetite) within a polymeric matrix such as Viton, a fluorinated elastomeric polymer. These ferromagnetic particles may or may not be metal-coated. In addition, they may also be "spherical", to enhance the filtering effect. The filtering layer provides the "filter line" protection against internal RFI and microwave interferences traveling down the wire.

Abstract: An electronic data transmission cable with twisted pairs (16) and (18) twisted into group (32). To reduce electro magnetic interference between adjacent insulated conductors (12) twisted pair such as (16) and (18) are combined into group (32). Other groups (34) and (36) may be pulled in parallel or may be twisted together prior to forming cable (30).

Abstract: A twisted pair data bus cable is provided which is small, lightweight and flexible.The cable consists of a pair of insulated conductors twisted about one another, which has sections of the cable surrounded by metallic shielding, in which the sections surrounded by metallic shielding having a thicker insulation cross section than the sections not surrounded by metallic shielding.

Abstract: A color coded twisted pair and method of making. First conductor (12) and second conductor (16) are extruded with first insulating material (20) and piggyback extrusion technique is used to extrude a second insulating coating (21) different in color from said first insulating coating (20). Second insulating material (21) covers less than 90.degree. but greater than 0.degree. of said first insulated wire and second insulating material (21) covers more than 180.degree. but less than 360.degree. of said second insulated wire.

Abstract: The present invention features a new "filter line" cable of very thin construction. The thinner cable has a reinforcing mesh layer that lends physical strength to the otherwise thinner, weakened cable. Additionally, the reinforcing mesh provides grounding and some shielding. The reinforcing mesh layer is made of a thin metal wire or metal-coated fibers. The filter line cable has a conductive core having a primary insulation layer. Over the primary insulation is a filtering layer made up of metal-coated ferromagnetic particles of ferrite or magnetite dispersed within a polymeric matrix such as Viton, a fluorinated elastomeric polymer. The ferromagnetic particles may be "spherical", to enhance the filtering effect. The filtering layer provides the "filter line" protection against internal RFI and microwave interferences traveling down the wire. Over the filtering layer is a layer of metal wire or metal-coated fibers, woven or served into a mesh.

Abstract: An armature winding structure for use in an electric motor includes a web-shaped strand bundle composed of a plurality of parallel strands. The strand bundle has a plurality of longitudinally spaced bends and a plurality of straight strand bundle segments. Adjacent ones of the strand bundle segments are positioned one on each side of one of the bends. The strand bundle segments are transversely staggered on one side of the strand bundle successively from one end to the other of the strand bundle, by intervals each substantially equal to the width of the strand bundle. The strand bundle segments thus staggered are longitudinally folded over along fold lines extending respectively across or near the bends transversely of the strand bundle, thereby providing a plate-like winding in which the strand bundle segments lie adjacent to one another.

Abstract: The present invention features a new shield material useful in the fabrication of shielded wire or cable articles. The conductive core of the wire and cable is layered with a shielding wrapping tape, foil or film. A shielding insulation compound can also be extruded over the conductive wire or cable core. Wire and cable articles containing the new shield material have an extended interference frequency attenuation range resulting from the improved shield layer. The shield material contains shaped ferrite particles dispersed within a polymeric binder, such as a fluorocarbon polymer. The shaped particles are generally spherical.

Abstract: Methods and apparatus are provided for providing an electrically matched pair (20) of insulated metallic conductors (21,21). Insulation is applied to successive portions of a length of wire-like metallic conductor (22) after which a colorant material (37) is applied to the surface of a plastic insulation material of a first portion of the length of the metallic conductor which is being moved along a path of travel. Facilities are provided for shielding a supply of the colorant material from the moving insulated metalic conductor and for then exposing a second portion of the length of the insulated metallic conductor to a different colorant material. The insulation and the colorant materials and their disposition with respect to the insulation are such that the dielectric constant of one insulated metallic conductor of the pair is substantially equal to that of the other.

Abstract: The present invention features a shielded wire and cable article capable of meeting stringent aerospace specifications and requirements, particularly that of low weight. The article generally comprises an inner conductive core of one or more wires that can be bare or individually insulated, and that can be straight, twisted or braided within the core. The core can also comprise a multicore consisting of a plurality of core members. The conductive core is surrounded by one or more thin layer(s) of insulation about which the shielding of this invention is applied. The shielding comprises a braided or served mesh or woven yarn of metallically coated fibers, characterized by high tensile strength and flexibility. Where the fibers themselves are braided, the resulting mesh can be braided more tightly about the interior insulation surface than can conventional meshes.

Abstract: A fire-resistant cable (20) which is suitable for the transmission of high frequency signals in a local area network includes a core which comprises a plurality of twisted pairs (22,22) of insulated conductors (24,24) and a jacket (35). Each insulated conductor of each pair includes an elongated metallic member (26) and an insulation system (28). The insulation system which is characterized by a suitable low dissipation factor includes dual layers, an outer one of which includes a flame-retardant plastic material. Also, the insulation system is characterized by a suitably low dielectric constant and by compatibility with a relatively short pair twist scheme. In one embodiment, the insulation system includes an inner layer (30) of a polyolefin plastic material and an outer layer (32) of a flame-retardant polyolefin plastic material.

Abstract: An audio signal transmission line comprising an additional inductance inserted in series with the line and/or coupled in parallel therewith near the load end of the line for providing a low pass filter which overcomes parasitic and dielectric capacitance of the line so as to reduce audio frequency noise generated in the line by low level and low frequency audio signals. The magnitude of the inductance used may vary widely, e.g. from 20 microhenries to 1 millihenry, depending on the length of the line and the space available.

Abstract: An improved cable assembly having a plurality of conductors held in flat cable sections by a carrier film and cable sections in which the conductors are not held by the carrier film and method for forming such a cable assembly. The flat sections are identified by an indicia on the outer surface of the outer jacket. The method includes the steps of marking the location of the flat cable sections with a ferromagnetic implant, extruding an outer jacket around the conductors and implant, detecting the location of the implant, and applying indicia to the outside surface of the outer jacket to identify the location of the flat cable section.

Abstract: A structure for an electrical cable which may be used as a high-frequency signal transmission line and which includes a jacket which is highly permeable by fluids to reduce the time required for stabilization of impedance and transmission speed of the cable upon placement into an environment characterized by a fluid dielectric having a different dielectric constant. The permeable jacket also facilitates electrical connection to a shield conductor of the transmission line, exposed through apertures in the jacket, by use of electrically conductive potting materials, and without the need to remove any portions of the jacket surrounding the shield conductor to which electrical connection is to be made.

Abstract: A telecommunication cable in which pairs of twisted together conductors are spaced apart to minimize capacitance unbalance and cross-talk. A central core member may be provided with the conductor pairs extending around the core member which may have spokes to separate the conductor pairs. Alternatively, the cable jacket has inwardly directed spacers which separate the conductor pins and hold them in recesses defined by the jacket.

Abstract: A balanced mode transmission system (20) for use in a local area network includes at least one twisted pair of insulated metallic conductors (27--27) which at its end is connected through a transformer to a transmitting computer and to a receiving computer (48). Each pair of conductors adjacent to the transmitting end and optionally adjacent to the receiving end is provided with a longitudinal choke (56,57). Also, a longitudinally extending metallic wire (60) is included in the system and is connected possibly through a resistor to ground at each end. The combination of the longitudinal choke at least adjacent to the transmitting end and the longitudinally extending metallic wire is superbly effective in suppressing electromagnetic interference notwithstanding the absence of shielding.

Abstract: The present invention features a shielded wire and cable article capable of meeting stringent aerospace specifications and requirements, particularly that of low weight. The article generally comprises an inner conductive core of one or more wires that can be bare or individually insulated, and that can be straight, twisted or braided within the core. The core can also comprise a multicore consisting of a plurality of core members. The conductive core is surrounded by one or more thin layer(s) of insulation about which the shielding of this invention is applied. The shielding comprises a braided or served mesh or woven yarn of metallically coated fibers, characterized by high tensile strength and flexibility. Where the fibers themselves are braided, the resulting mesh can be braided more tightly about the interior insulation surface than can conventional meshes.

Abstract: A semi-conducting pyrolyzed glass fiber layer equalizes the electrical potential on the exterior surface of an insulated conductor when the layer covers the surface. The layer prohibits the development of a corona discharge and bleeds off any electrical charge developed thereon when the layer is electrically coupled to a body having a known potential. The insulated conductor may be windings in a dynamoelectric machine.

Abstract: An interconnection cable for audio frequency high fidelity applications, such as loudspeakers, is provided wherein a first wire and a second wire extend between a reference end and a terminal end, the second or auxiliary wire being divided into two serial segments by a single electrical discontinuity separating each segment, wherein each segment is conductively terminated at its respective end in a signal common or ground with the first wire, and wherein the electrical discontinuity is at between 9/16 and 23/32 of the distance from a reference end. Multiple interconnection cables may be assembled into balanced transmission lines for a signal path and a signal return. It is preferable that the reference end be at the signal source and the terminal end is at the signal load.

Abstract: A cable for the transmission of signals from an amplifier to a loudspeaker which includes two insulated conductors forming respective leads, and a sheath enclosing the two leads. The conductors can be solid wires having a smooth surface and made of oxygen-free copper. In the alternative, the conductors can be composed of elementary wires, the elementary wires of each conductor being stranded together in the same wire drawing direction, and the conductor composed of the stranded elementary wires being of a unilay structure, the conductor being additionally compressed.

Abstract: A ribbon cable carrying ground and signal wires in a single plane includes, at predetermined intervals, separator materials inserted between the signal wires and the ground wires to facilitate separation upon termination. A method for manufacturing such a cable includes the steps of separately guiding the signal and ground wires to a lamination station, and means for inserting the separator material between the signal and ground wires at predetermined intervals prior to lamination.

Abstract: A cable interconnection for an audio component system includes a first cable and a second cable. The first cable has a pair of first conductors, each of the first conductors are adapted to make an electrical connection between a source positive terminal and a load positive terminal of a signal source and load, respectively. The second cable has a trio of second conductors. A first one and a second one of the trio of second conductors, are each adapted to make an electrical connection between a source negative terminal and a load negative terminal of the source and load. A third one of the trio of second conductors is adapted to be coupled electrically only to the load negative terminal. The third one of the second conductors extends substantially the full length of the second cable. A rheostat may be provided to be coupled electrically in series between the third one of the second conductors and the load negative terminal.

Abstract: A miniature controlled-impedance transmission line consists of a flexible cable having side-by-side conductors transmitting high frequency signals. The cable is preferably in the form of a pair of conductors, each surrounded by respective inner and outer dielectric layers of different compositions. The inner and outer dielectric layers are applied to each conductor independently of the other conductor, after which the respective outer dielectric layers of the two conductors are bonded together in side-by-side relationship without altering the inner dielectric layers. The result is a conductor pair having minimum cross-section for high-density applications and uniform capacitance which is also stable in that it will not change with subsequent bending or handling.

Abstract: An unshielded telecommunications cable with a nominal characteristic impedance of 100 ohms and a core with a maximum of six pairs of individually insulating conductor wires. The wire insulation is a flame retardant polyolefin base compound and the conductors of each pair are twisted together with a maximum twist lay of 2.3 inches. The core is surrounded by a flame retardant jacket.

Abstract: A flexible circuit conductor run for connecting circuit elements comprises a thin sheet which includes a plurality of pairs of generally parallel spaced-apart thin conductors.Each conductor in each pair of conductors includes alternating lengths of crossing portions and extending portions. Each length of conductor extending portions includes generally sidewardly-projecting tine portions.Such flexible circuit conductor run enables the characteristic impedance thereof at high power and operating frequencies to be substantially matched with the characteristic impedance of the circuit elements at such power and operating frequencies, to enable effective signal transfer and reduced signal loss between the circuit elements through the flexible circuit conductor run.

Abstract: The cable is made up of a series of pairs stranded alternately in one direction and the other. At the locations of the reversal of the stranding direction, the individual conductors are kept in the form of a web and welded together side by side. Between two thus bonded segments, the adjacent pairs are twisted in opposite directions. A ground wire is provided with lengths of sheathing which come to be placed in the bonded segments. These segments are marked by deposition of a radioactive substance or other indicator material detectable during a subsequent stage of manufacture and actuating marking. Once overall stranding and jacketing have taken place, or during those stages, the bonded segments are spotted owing to the indicator substance and are marked visibly.

Abstract: Disclosed is a bar or conductor constituted by a plurality of strands disposed in a slot and extending outward from the opposite ends of the slot with each of the strands being substantially bisymmetrically vertically slanted so as to be transposed in the vicinity of a longitudinally central portion of the slot-inside bar portion. Each of the strands being transposed such that the respective strand arrangements at the opposite ends of the slot-outside bar end portions are reversed with respect to each other, with the total number of transposed portions of all the strands is less than three times the number of the strands.

Abstract: An interconnection cable for audio frequency high fidelity applications comprises a first and a second conductor which are disposed close to one another and connected at the ends, wherein the second conductor has an electrical length which is a least three times longer than the first conductor. The second conductor is helically wound about the first conductor. A third conductor may be included in the space within the helical winding, and in one embodiment may be connected at the ends of the first and second conductor. In another embodiment, the third conductor may be insulated from the first conductor and the second conductor for signal return.

Abstract: An apparatus for minimizing degradation of fidelity of a signal in a transmission line intended for carrying signals of wavelengths greater than the length of said transmission line and wherein the signals are of frequencies over several octaves, wherein a structure of ferromagnetic material is employed encircling a transmission line and the ferromagnetic material, preferably a toroid, serves as core to a transformer with a secondary having a termination in a substantially short circuited load whereby ringing signals in the transmission line are dissipated in the secondary circuit. Therefore, the invention causes the frequency response of a cable to be umimpaired for the desired signal, and it simultaneously and selectively couples the undesired reflection currents into a secondary circuit where they are dissipated.

Abstract: A cable (20) which is particularly suited to the transmission of substantially error-free data at relatively high rates over relatively long distances includes at least two pairs of individually insulated conductors (42--42). The pairs of individually insulated conductors are enclosed in a tubular member (51) comprising a plastic material. A metallic shield (54) may or may not enclose the tubular member, and in a preferred embodiment, a plastic jacket (58) is provided. The twist length of each pair of insulated conductors does not exceed a value equal to the product of about forty and the outer diameter of the plastic insulation. Further, the twist lengths among the conductor pairs are varied in accordance with a twist frequency scheme modulated by non-uniform increments of twist frequency.

Abstract: A networking system to interconnect computer terminals with a host computer, the system being capable of carrying data bits at high frequencies and being capable of readily having its interconnection pattern changed. The system includes a plurality of composite cables for transmission of the data bits, one such cable for each such computer terminal, each of the cables including at least two sets of twisted pair data lines and an associated drain line, each set of data lines being within a shielding sleeve, and said sleeves being isolated from one another. A distribution wiring board for interconnecting the cables with the host computer, the wiring board including a punch down block with multiple sets of aligned punch-down connectors for connecting the wires in the sets and the drain wires to the wiring board, means for grounding the drain wires, and a data board for changing the local area network formed by the cables and the computer terminals.

Abstract: The cable is made up of a series of pairs stranded alternately in one direction and the other. At the locations of the reversal of the stranding direction, the individual conductors are kept in the form of a web and welded together side by side. Between two thus bonded segments, the adjacent pairs are twisted in opposite directions. A ground wire is provided with lengths of sheathing which come to be placed in the bonded segments. These segments are marked by deposition of a radioactive substance or other indicator material detectable during a subsequent stage of manufacture and actuating marking. Once overall stranding and jacketing have taken place, or during those stages, the bonded segments are spotted owing to the indicator substance and are marked visibly.

Abstract: Arrangement for reducing cross talk between electrical circuit conductors wherein the conductors lie within individual parallel channels within the same plane or different parallel planes within the induced voltage or cross talk region of an energized and a quiet conductor and either converge or diverge with respect to each other. The amount of relative convergence or divergence, preferably mor than six degrees and less than 15 degrees, is that required to attenuate the magnitude of any signal induced by the activated conductor in a neighboring or quiet conductor to maintain an acceptable and desired signal-to-noise ratio.

Abstract: A twisted pair flat cable suitable for use in undercarpet environments is disclosed. A plurality of twisted pairs are positioned side-by-side, each in separate compartments formed within a hollow envelope of an extruded outer sheath. Separator ribs which do not extend across the entire height of the sheath prevent lateral movement of twisted pairs out of their respective compartments. By cutting the outer sheath at only one location, the outer sheath can be folded back to deploy the twisted pairs for termination. Laterally adjacent solid members suitable for withstanding compressive loads can be employed with a centrally disposed sheath.

Abstract: A cable assembly including a plurality of wire conductors of varying diameters and a strand of fibrous material wrapped around each conductor or bundles of conductors.

Abstract: The present invention relates to single and twisted pair transmission line wires wherein the effective electrical diameter of the primary conductor is increased. This is accomplished by wrapping conductive foil or conductive foil laminated to a substrate layer onto a primary conductor with a diameter less than 20 mils wherein the foil is in contact with the conductor and has an outer insulating cover.This may be done by either spiral wrapping or by longitudinal wrapping around the electrical conductor. This invention provides a desired characteristic impedance along the length of the wire(s) and allows easy removal for standard termination and increased cut-through resistance.

Abstract: A flat cable for use with a mass termination connector having a plurality of regularly spaced terminal elements. The flat cable includes a laminated carrier film and a plurality of discrete conductors held in regularly spaced parallel relationship by the carrier film to match the terminal element spacing of the connector. Each conductor has an insulating jacket made of a thermoplastic material. The carrier film includes an attachment layer of thermoplastic insulatioln having a melting temperature similar to that of the jacket material, and a dimensional stabilization layer made of an insulative material having a melting temperature higher than those of the attachment layer and the jacket material and displaying dimensional stability at the melting temperatures of the attachment layer and jacket material. The jackets of the conductor are fused to the attachment layer, and the attachment layer is held by the stabilization layer.

Abstract: A cable (20) which is particularly suited to the transmission of substantially error-free data at relatively high rates over relatively long distances includes at least two pairs of individually insulated conductors (42--43). Each pair of individually insulated conductors is enclosed individually in its own tubular member (51) comprising a plastic material. A metallic shield (60) encloses the tubular members, and in a preferred embodiment, a plastic jacket (80) encloses the shield. In the preferred embodiment, two pairs of voice communications conductors are disposed at opposed locations between the shield and the jacket. The thickness of the tubular member is such that each insulated conductor of each twisted pair is caused to be spaced from the shield a distance which is not less than one half the diameter of the metallic wire portion of each pair enclosed by the tubular member.

Abstract: A directional transmission cable is disclosed which has a plurality of insulated conductive wires. The cable also has a source terminal and a destination terminal. A first connection of a collection of more than one of the wires is made to the source terminal. A second connection of less than all of the collection of wires is made to the destination terminal. A faithful transmission of a signal is made from the source terminal to the destination terminal.

Abstract: A signal cable assembly comprising a pair of cables adapted to respectively carry the positive and negative audio signals between a power source and a load. Each cable consists of a first conductor formed by a plurality of bundles of wire strands twisted together to form a single conductor, and a second conductor in the form of a solid conductor having a diameter larger than the diameter of each wire strand. Insulation sleeves extend around the conductors for at least a portion of the length thereof.

Abstract: Apparatus for changing relative positions of conductor pairs in a cable core in which each pair is moved through its individual guide movable around a substantially circular path. The guides lie in series and move independently of one another. An array forming device at the downstream end of the movable guides has a smooth convex surface for engaging the conductors and holds them in an array while enabling the pairs to change their relative positions in the array as dictated by movement of the guides. A closing die for the conductor pairs is located downstream from the array forming device.

Abstract: A parallel data transmission system (20) comprises a cable (40) which is capable of balanced mode transmission but which is driven in an unbalanced mode. The cable includes a plurality of twisted pairs of individually insulated conductors (42--42) enclosed by a metallic shield (54). The twist lengths are relatively short to cause the pairs to be decoupled sufficiently from one another to allow substantially error-free, parallel transmission over relatively long distances. Interposed between the core and the shield is a spacing member (52) which has a relatively low dielectric constant. Receiving facilities are provided for detecting whether the level of transmitted signals is above or below predetermined threshold values and for converting the received signals into one of two or more logic levels. Advantageously, this system increases substantially the distances over which substantially error-free transmission in an unbalanced mode can be accomplished.

Abstract: Improved method and apparatus for manufacturing transposed ribbon cable, an improved ribbon cable, and an improved transposed ribbon cable. The transposed ribbon cable is manufactured by the method and apparatus of the invention by folding a ribbon cable angularly with respect to the longitudinal axis repeatedly while advancing the ribbon cable incrementally.

Abstract: An improved ribbon cable comprising a plurality of insulated wires juxtaposed in fixed relationship to each other. An improved transposed cable in which each conductor of the cable of the invention is in the form of a continuous helix. An electromagnetic device having the ribbon cable of the invention as its magnetic windings, and methods and apparatus for manufacturing both the ribbon cable and the transposed cable of the invention.

Abstract: To simplify the fabrication and use of a transposed bar, the strip of insulating material for the strut projects higher than the conductor element stack and is incised along the longitudinal edges. Sections are formed, some of which (i.e., those immediately adjoining the offset location) are bent to be positioned below the offset points during the inserting of the strip. The non-incised surface of the strip serves as the strut of the transposed bar. The need for manual insertion of square- or diamond-shaped strips for additional insulation of the offset points is thereby eliminated. As the sections also contain a hardening resin, the internal corona shielding is improved.

Abstract: A signal cable assembly comprising a pair of cables adapted to respectively carry the positive and negative audio signals between a power source and a load. Each cable consists of a first conductor formed by a plurality of bundles of wire strands twisted together to form a single conductor, and a second conductor in the form of a solid conductor having a diameter larger than the diameter of each wire strand. Insulation sleeves extend around the conductors for at least a portion of the length thereof.