Abstract: The present invention describes a directional CATV component, preferably a signal tap, having a housing frame where coaxial signal cable connections are made allowing for tap circuitry to be placed on either side of the housing frame. The invention allows for the rapid exchange of tap circuitry between front and rear positions providing for the reversal of signal frequency direction. The signal tap comprises a housing frame, a back cover with a support clamp and a signal tap cover containing a plurality of female F-connectors. Loss circuitry is mounted on a PC board that is attached to the tap cover.

Abstract: An integrated circuit tester produces an output TEST signal following a pulse of a reference CLOCK signal with a delay that is a sum of an inherent drive delay and an adjustable drive delay. The tester also samples an input RESPONSE signal following a pulse of the reference CLOCK signal with a delay that is a sum of an inherent compare delay and an adjustable compare delay. The inherent drive and compare signal path delays within an integrated circuit tester are measured by first connecting a salphasic plane to transmission lines that normally convey signals between the tester and terminals of an integrated circuit device under test. A standing wave signal appearing on that salphasic plane is phase locked to the CLOCK signal so that a zero crossing of the standing wave occurs at a fixed interval after each pulse of the CLOCK signal.

Abstract: A power amplifier for a radio communication system is provided which includes a divider for equally dividing a received signal into two signals, an amplifier for separately amplifying the divided signals with a same gain, and a combiner for combining the separately amplified signals into one output signal. The divider includes a first FET for equally dividing a signal received at a gate thereof into a signal being output at a drain thereof and a signal being output at a source thereof, a first inductor for coupling the drain of the first FET to a ground, a second inductor for coupling the source of the first FET to the ground, a first capacitor for coupling the drain of the first FET to an input of the first amplifier, and a second capacitor for coupling the source of the first FET to an input of the second amplifier.

Abstract: An amplifier (300) comprising two amplifier stages (301, 303), a signal splitter (305), and a signal combiner (307) amplifies an amplitude-varying input signal (128) in the following manner. The signal splitter (305) receives a signal of varying amplitude (128) and splits the received signal into a first amplitude-varying signal (325) and a second amplitude-varying signal (327). The first amplifier stage (301) applies a first gain to the first amplitude-varying signal (325). The second amplifier stage (303) applies a second gain that is greater than the first gain to the second amplitude-varying signal (327) only when an amplitude of the second amplitude-varying signal (327) exceeds a threshold. The signal combiner (307) combines the amplified signals outputted from the amplifier stages (301, 303) to produce the amplifier output signal.

Abstract: A conducting housing (to be closed by a lid) for a coaxial cable distribution network has a common port and one of an aerial or pedestal port. A motherboard carries an RF circuit and a transfer switch. In one setting of the transfer switch the RF circuit connects a coaxial pin at the common port with a coaxial pin at the pedestal port. In the other setting the common port pin is connected to the aerial port pin. When the aerial port is used on a rectangular housing, a transmission line forms part of the RF circuit between the motherboard and the aerial port. The transmission is preferably a central conductor spaced over most of its length by air from an outer conductor in the form of an inverted U enclosing the central conductor on three sides. Preferably a ground plane on the back of the motherboard connects to the transmission line outer conductor to provide a path entry in the housing at both ends for ground currents generated by signals in the RF path.

Abstract: A multi-tap RF modulator includes an amplifier for amplifying a telecast RF signal input to an antenna input port; a modulation section for modulating the RF signal output from a VCR, SVR, or game player; and a mixer/splitter having more than one RF output tap and for mixing the first RF signal output from the amplifier and the second RF signal output from the modulation section, the mixed RF signals being distributed into more than one RF signal. The modulator with more than one output tap enables a user to view several TV sets at the same time.

Abstract: A branched transmission line, used for delivering control signals to integrated memory circuits. Memory circuits require control signals, which are delivered on control lines. If multiple memory circuits are involved, multiple control lines are used. If the multiple control lines branch from a common branch point on a supply line, undesirable reflections can occur. The invention reduces the reflections, by distributing the branching, as by starting with three initial branches, each of which branches into three other branches, in order to feed nine memory circuits.

Abstract: A CATV power inserter is presented allowing multiple power sourcing configurations while providing isolation between the RF signal and alternating current insertion ports. The power inserter achieves the variety of configurations by using a four point terminal block having uniform dimensions allowing simple connecting bars and fusing or current limiting options to be interchanged thereby increasing economy and performance.

Abstract: The invention proposes a lumped constant compensated high/pass balun (balance line to unbalance line transition). The proposed circuit can be used in microwave integrated circuit(MIC) and mononolithic microwave integrated circuit(MMIC) designs. The basic operating principle of the proposed circuit is to use two sets of lumped type high pass and low pass filters to synthesize a microwave balun. The first filter set provides the wide band 180.degree. phase difference property for the balun circuit. The amplitude imbalance of the balun is compensated by the other filter set. The advantage of the proposed circuit is to replace the bulky and non-planar distributed balun or traditional transformer in low microwave frequency range.

Abstract: A tool is described for shunting a multi-tap for an RF cable system by connecting a low-pass filter between an unused input port and an unused output port of the multi-tap. The components of the filter are such as not to interfere with the circuits of the multi-tap when both are in the circuit. A light is provided for indicating when the tool is in operative position.

Abstract: A tool and method for bypassing a signal. The bypass tap tool generally comprises a housing, a pair of conductively interconnected contact assemblies and an insulation assembly. The contact assemblies are positioned in and extending from the housing. The insulator assembly is mounted on the housing and includes two insulator extensions. Each extension is adjacent to a respective contact assembly and is moveable between a non-insulating position and an extended insulating position.To prepare the signal tap for service, the bypass tap tool is interconnected with the signal tap with the contact assemblies entering the plug ports and conductively contacting the contact terminals to provide a bypass route and the extensions are moved from the non-insulating position to the extended insulating position wherein they are adjacent to and insulate the contact terminals.

Abstract: An RF combiner, of the Wilkinson type, capable of very wide band and high power continuous wave (CW) energy transmission, e.g., of a 5 way design, consisting of 5 input connected transformers coupled to two output providing transformers, with 5 balancing resistors respectively connected between the input terminals to the input connected transformers. The transformers are provided with ferrite cores in the form of one block for the input transformers and one block for the output transformers and the broader frequency band is obtained by properly selecting the ferrite material of the blocks making up the transformer cores, preferably with a permeability of 1600 that will provide a 2-150 MHz frequency range.

Abstract: In junction boxes for coupling T.V. signals and low frequency power waves on a coax line to a plurality of users, the T.V. signals are coupled via connections in a first compartment to a plurality of coax cables, and the low frequency power wave are coupled via low pass-filters to IDC connections in a second compartment.Leads from users are passed through a chamber on the wall of the second compartment containing a self-healing, self-supporting insulating substance and attached to the IDC connectors. The IDC connectors permit the lead to be paired through them so that an installer can know when the leads are properly partitioned.

Abstract: A multi-tap is described having two compartments, a microstrip in each compartment for conducting RF signals and AC power from an input at one end of the multi-tap to a first output port at the other end, a cover for each compartment having a circuit thereon that is substituted for the microstrip in a compartment when the cover closes that compartment, a device near the first output port that can be adjusted to direct RF signals and AC power passing through the microstrips to a point other than the first output port and additional microstrips for conducting RF signals and AC power from that point, when the RF signals and AC power are present thereat, to a second output port located near the input port. Grounding shields are provided for shorting the additional microstrips when the device is adjusted to deliver RF signals and AC power to the first output port. When the cover of a compartment is closed, it activates a switches formed in part by ends of the microstrips.

Abstract: A high-frequency signal branching device comprises a main body having an input terminal and an output terminal for connecting trunk cables on an input and an output side, respectively, and a branch body having a branch terminal for connecting a branch cable. This construction allows the number of branch terminals to be increased by replacing the branch body while keeping the main body intact. A branching circuit for branching a high-frequency signal from the trunk cable is provided in the branch body. Accordingly, the branching circuit also can be replaced by replacing the branch body.

Abstract: A high speed bus circuit system according to the present invention includes a bus having alternately connected resistors and transmission lines, and integrated circuits. Each of the resistors has a predetermined resistance value. The transmission lines are mounted on print circuit boards. The bus is connected in a loop form as a whole. Each of the integrated circuits has a driver and a receiver. The driver and receiver are connected to respective one of the resistors. As a result, DC power dissipation in the terminal resistor of the bus circuit is suppressed. In addition, high speed signal transfer causing less waveform distortion is made possible.

Abstract: A CATV passive signal component is disclosed performing bidirectional power insertion or extraction while providing directional RF signal splitting. The signal splitter presents a low burden to the distribution system and can bidirectionally pass alternating or direct current already impressed on the RF signal, or, provide an insertion or extraction function.

Abstract: A line coupler is provided having a bus line piece, at least one transformer, two electrically shielded housings and a coupling site. The transformer is equipped with two primary and two secondary winding terminals. The two primary winding terminals are connected to the pair of coupling elements located at the coupling site. Each coupling element is connected to one of the bus line wires contained in the bus line piece. The secondary winding terminals are connected to branch line wires, which are brought out from the secondary electrical shielded housing. The two electrically shielded housings are electrically connected to each other by two connectors, these connectors also allow the two housings to be releasably connected.

Abstract: The present invention provides a tap off unit for use in a multiple dwelling unit. The tap off unit includes a housing having an input terminal and an output terminal for interposing the tap off unit in a cable signal line, a plurality of taps disposed within the housing, with each tap having a faceplate including associated signal coupling circuitry, and a circuitry board disposed within the housing. The circuitry board distributes a signal from the cable signal line to each of the plurality of taps within the housing and the plurality of taps are connected in parallel such that one of the plurality of taps may be removed without disruption of the signal to the remaining taps.

Abstract: A continuity bridge in a broadband signal tap for providing a make-before-break connection of an input terminal to an output terminal of the tap. The broadband signal tap comprises a housing and a cover that is removably connected to the housing. The interior of the housing has an input terminal for receiving a signal from the feeder cable and an output terminal for returning the signal to the feeder cable. The cover includes circuitry for splitting the signal and delivering a portion thereof to at least one subscriber port on the cover. The cover has an input socket and an output socket, each being removably engaged with and electrically connected to the input and output terminals, respectively, of the housing. The continuity bridge in the housing connects the input terminal to the output terminal upon the removal of the cover from the housing prior to the disengagement of the sockets from the terminals.

Abstract: A splitter/combiner module for radio frequency signal circuits includes an electrically conductive housing. Coax connectors are secured to the rear face of the housing. A circuit board is contained within the interior spaced between sidewalls of the housing. A ground side of the circuit board includes a layer of electrically conductive material which is electrically connected to the housing. Components on the circuit board include splitter/combiners for splitting a signal into a plurality of branch signals each having an individual attenuator component.

Abstract: A multi-tap distribution box is disclosed in which the positions of the input terminal and the output terminal are selectable. A housing (1) has in the center portion thereof an attachment portion (5) on which main line terminals (5a, 5b, and 5c) are provided. Two terminals are located above, and on both sides of the center of, the housing (1) while the other terminal is located directly under one of the two terminals. A mother board (6) with transmission terminals (7) is mounted on the attachment portion (5) so that the transmission terminals (7) are connected to a select pair of the main line terminals. A branch unit (15) which includes a branch terminal (17) is detachably mounted on the mother board (6) on which a main body (21) with a tap board (20) is in turn mounted. When the main body (21) is mounted, an input terminal (23) provided on the tap board (20) is connected to the branch terminal (17) of the branch unit (15).

Abstract: A distribution apparatus is provided which, if a short circuit occurs in a secondary line from a branch output terminal of the apparatus or in terminal equipment connected to the secondary line, stops supplying electric currents to the concerned branch output terminal. In the distribution apparatus, external taps (22) which serve as distribution output terminals are connected to a current passage network (26). A positive thermistor (27) is connected to each external tap (22) in the current passage network (26).

Abstract: A mixer circuit is provided which incorporates inductive elements for low voltage applications. The circuit consists of a balanced amplifier and a switch composed of transistor pairs driven by a local oscillator signal for multiplying the signal to produce a circuit output signal having a predetermined intermediate frequency. Inductors are used to provide degenerative feedback in the balanced amplifier portion of the circuit. The inductors generate negligible noise and produce a negligible dc voltage drop. The transistors in the circuit are thereby maintained in saturation regions of operation as desired. In accordance with another aspect of the invention, an inductor or, alternatively, a parallel inductor-capacitor circuit, is used as a constant current source in conjunction with the input transistors in the balanced amplifier portion of the circuit.

Abstract: A method and system for distributing multimedia signals to a subscriber from a headend unit. The multimedia signals are transmitted on a network media as an RF signal. The RF signal is fed to an input terminal of a tap which has an RF circuit that splits the RF signal and distributes to an output terminal. The RF circuit splits the RF signals, and feeds the split signal to a plurality of connectors on the tap's front panel. The RF signals on the output terminal are fed downstream to a plurality of subscribers. A plate is placed in the tap such that when the RF circuit is removed for repair, maintenance or service, an electrical connection is maintained between the input and output terminal to prevent a disconnection of service downstream.

Abstract: A conducting housing (to be closed by a lid) for a coaxial cable distribution network has a common port and one of an aerial or pedestal port. A motherboard carries an RF circuit and a transfer switch. In one setting of the transfer switch the RF circuit connects a coaxial pin at the common port with a coaxial pin at the pedestal port. In the other setting the common port pin is connected to the aerial port pin. When the aerial port is used on a rectangular housing, a transmission line forms part of the RF circuit between the motherboard and the aerial port. The transmission is preferably a central conductor spaced over most of its length by air from an outer conductor in the form of an inverted U enclosing the central conductor on three sides. Preferably a ground plane on the back of the motherboard connects to the transmission line outer conductor to provide a path entry in the housing at both ends for ground currents generated by signals in the RF path.

Abstract: In a CATV housing:the main RF circuit, a coupler circuit and splitter circuit are located respectively on a platform board, coupler board and splitter board respectively. The coupler board is between and perpendicular to the platform board attached to the housing and to the splitter board attached to the lid. The coupler circuit has a main RF circuit input and output near the bottom of the coupler board and a tap output to the splitter at the top of the board. A ground plane on the coupler board approximates, relative to the coupler circuitry, transmission line impedance. In combination with ground planes on the platform board and splitter board, the ground planes provide approximate transmission line impedance to both the main RF path and to the path through the coupler to the splitter output.

Abstract: A screwless bypass for cable signal tap is provided to prevent interruption of a cable signal when the tap cover is removed. The bypass means comprises a flexible spring leaf, compressible collets and end terminals. Contacts are released so that the spring leaf contacts a pair of end terminals to complete a signal path between the ends of the tap.

Abstract: An N-way power combiner is presented herein for combining N RF signals. This combiner includes N input ports each for receiving an RF input signal. N transmission paths respectively extend from the N input ports to a common output port. N reject loads are respectively associated with the N paths, with each reject load having first and second ends with the second ends of the N reject loads being connected together in common. N impedance networks are respectively associated with the N paths. Each of the N impedance networks includes an inductor coil. A common connection means is provided for the inductor coils and the connection means has opposing sides. The N inductor coils are symmetrically arranged relative to the common connection means with some of the coils being located on one side of the common connection means and the other coils being located on the opposite side of the common connection means.

Abstract: In a CATV housing the main RF circuit, a coupler circuit and splitter circuit are located respectively on a platform board, coupler board and splitter board respectively. The coupler board is between and perpendicular to the platform board attached to the housing and to the splitter board attached to the lid. The coupler circuit has a main RF circuit input and output near the bottom of the coupler board and a tap output to the splitter at the top of the board. A ground plane on the coupler board approximates, relative to the coupler circuitry, transmission line impedance. In combination with ground planes on the platform board and splitter board, the ground planes provide approximate transmission line impedance to both the main RF path and to the path through the coupler to the splitter output.

Abstract: A high frequency signal dividing and/or combining device includes a circuit formed in a laminated sintered dielectric block, input and output terminals grounded through input and output grounding capacitors respectively, inductors (coils) and a resistor. The coil is formed in a coil section having at least one dielectric layer with a conductive coil pattern. The capacitors are formed in at least three dielectric layers including base, intermediate, and upper dielectric layers. The base dielectric layer includes a grounding electrode pattern providing a common grounding electrode for the input and output grounding capacitors. The intermediate dielectric layer overlaps the base dielectric layer so as to cover the grounding electrode pattern.

Abstract: A method and system for distributing multimedia signals to a subscriber from a headend unit. The multimedia signals are transmitted on a network media as an RF signal. The RF signal is fed to an input terminal of a tap which has an RF circuit that splits the RF signal and distributes to an output terminal. The RF circuit splits the RF signals, and feeds the split signal to a plurality of connectors on the tap's front panel. The RF signals on the output terminal are fed downstream to a plurality of subscribers. A plate is placed in the tap such that when the RF circuit is removed for repair, maintenance or service, an electrical connection is maintained between the input and output terminal to prevent a disconnection of service downstream.

Abstract: A clock signal distributing system supplies clock signals exhibiting extremely matched phases as a standing wave without employing extra signals such as a reference signal and the like other than clock signal itself. The system compensates for a phase lag in clock signal sand attenuation in signal amplitude. As a result, clock signals exhibiting extremely matched phases are supplied up to the places to be distributed at the respective terminals without requiring equal-length wiring on, for example, a semiconductor chip. The clock signal distributing system is composed of an electromagnetic transmission path line which transmits periodic clock signals as a standing wave, an amplifier, and a phase advancing unit which advances phases of the periodic clock signals wherein a phase lag in transmission of clock signals and a phase lag in amplitude of the amplifier are corrected in the phase advancing direction by the phase advancing unit.

Abstract: A signal distribution arrangement having a central signal source and a plurality of signal receivers located along a common path. Each of the signal receivers is coupled in communication with the signal source by a line arranged within the common path. To eliminate distortion of the signal due to outside interference sources, each of the lines is arranged within the common path so that it traverses the common path an odd number of times between the signal source and the receiver to which it is coupled, and traverses the common path an even number of times between the receiver to which it is coupled and the end of the common path. Within each segment of the common path, the relative propagation sensitivity of each line is controlled such that the product of the number of times the line traverses that segment multiplied the relative propagation sensitivity of the line is the same for all lines.

Abstract: A double-balanced mixer circuit which consumes less power, and is capable of operating on a low voltage power source, because an output of a first signal having a phase lag of 90.degree. from a first frequency signal and an output of a second signal having a phase lead of 90.degree. over the first frequency signal are provided by means of a first phase shifter, an output of a third signal having a phase lag of 90.degree. from a second frequency signal and an output of fourth signal having a phase lead of 90.degree. over the second frequency signal are provided by means of a second phase shifter, thereby generating a radio frequency signal by mixing the first signal and the third signal in a first dual gate circuit, and generating a radio frequency signal by mixing the second signal and the fourth signal in a second dual gate circuit.

Abstract: A central interconnector unit provides for the possible transfer therethrough of RF signals passing in m signal paths from respective signal sources to respective antennas disposed at a cellular telephony cell site to radiate those signals into different angular sectors of the site. The unit has a total capacity for amplifying such signals which is provided by n similar circuit pack amplifying sections (n being greater than m), having respective inputs and outputs connected to corresponding jack terminals on a backplane in the unit.

Abstract: In an electronic system such as an integrated circuit having a number of destination loads such as logic gates, signal is distributed along typically a zero'th level (e.g., polysilicon) electrical transmission line from an input terminal to the destination loads. The characteristics of the signal arriving at the destination loads are improved by (1) inserting an added electrical transmission line, and (2) connecting various nodes of the added electrical transmission line through auxiliary active devices, such as inverters, to various nodes on the zero'th level electrical transmission line. In one attractive arrangement, each of the auxiliary active devices has an electrical-current-drive capability that increases monotonically with the number of nodes intervening between it and the input terminal of the added electrical transmission line.

Abstract: An impedance transforming three-port power divider/combiner includes first, second, and third lumped elements (e.g. 54, 55, and 56). The first lumped element (54) couples the first port (51) and electrical ground. The second lumped element (55) couples the first and second ports (51 and 52), and the third lumped element (56) couples the first and third ports (51 and 53). A resistor (59) is coupled between the second and third ports (52 and 53). Capacitors (57 and 58) couple the second port (52) and the third port (53) to electrical ground. A signal input to the first port (51) results in identical divided output signals at the second and third ports (52 and 53). Signals input to the second and third ports (52 and 53) result in a combined output signal at the first port (51).

Abstract: A passive electric power splitter/combiner comprising a first inductor (117) between an input terminal and a first output terminal, a second inductor (119) between the input terminal and a second output terminal, a first capacitor (111) between the input terminal and ground, a second capacitor (113) between the first output terminal and ground, a third capacitor (115) between the second output terminal and ground, and a resistor (121) between the first output terminal and the second output terminal. Embodiments of the present invention can be fabricated that have little loss other than the intrinsic split loss, exhibit a uniform impedance at all ports, and exhibit electrical isolation between the output ports.

Abstract: A method and apparatus is disclosed for providing salphasic distributions of synchronization signals to physically separated entities typically composing a system. Salphasic behavior is a fundamental property of standing waves in any physical situation governed by the wave equation and where the signal is isophasic, i.e., its phase remains constant, over extended regions and abruptly jumps by 180.degree. between adjacent regions. This behavior is used to minimize the phase shifts due to propagation path lengths. A sinusoidal signal is generated and impressed on a distribution medium which is in turn connected to receivers at the various entities to be synchronized. The medium and loads due to the receivers are composed to cause the synchronizing signal to form nearly pure standing waves in the medium. This enables all the entities to receive the synchronizing signal substantially in the same phase to within an ambiguity of exactly 180.degree.

Abstract: An attenuator includes first resistors that are connected in series to each other at connection nodes and between an input node and a fixed voltage node, voltage output nodes coupled to the input node and the respective connection nodes of the first resistors, switches and corresponding second resistors being respectively connected in series between the connection nodes and voltage output nodes and commonly connected to an output node, and a load capacitance connected between an output node and the fixed voltage node. The phase between input and output signals is independent of the attenuation. A phase difference is added by the second resistor so that the phase shift determined by the voltage dividing ratio of the first resistors selected by closing a switch and by the value of the load capacitance is compensated.

Abstract: A variable RF power splitter including three serially connected inductors (14, 15, 16) powered by an RF power source (11, 12). Two loads (17, 18), between which the RF power is to be split, are connected to ground from two different points in the inductance string. A variable reactance (19) connected to ground from another point in the inductance string controls the RF power splitting.

Abstract: An electrical circuit provides a constant phase shift between two output signals derived from a common input. The output signals are designed to provide a constant phase shift at constant amplitude over a very large frequency range. The common input is provided to both a non-shift channel and a phase-shift channel. The non-shift channel comprises a fixed attenuator circuit that provides a non-shifted output signal. The phase shift channel comprises a low-pass RC filter circuit that provides a phase shifted output signal. The two output channels are connected by a transformer phase detector that generates an error signal. The error signal is input to an operational amplifier that provides a phase-shift control signal to the RC filter circuit of the phase-shift channel.

Abstract: An interface circuit for coupling a drop port to a trunk line carrying data processing signals, includes a transformer network connected between the trunk line and that drop port and a resistor network connected between the trunk line and the drop port wherein the resistor network includes a non-linear switching circuit for attenuating high amplitude data processing signals from the drop port and for isolating the resistor network thereby permitting data processing signals carried by the trunk line to be routed directly to the drop port without attenuation.

Abstract: The present invention involves a connector for inductively coupling to a multi-wire data bus utilizing a magnetic core and associated coil for inducing signals upon the bus and for sensing such signals on the bus. The connector includes a pair of magnetic members disposed on either side of the magnetic core for attenuating common mode energy generated within the connector at about the same frequency as that of the primary signal appearing on the data bus.

Abstract: An electrical system wherein the electrical conductive traces on the circuit boards are routed to achieve a balanced net to reduce noise caused by transmission line reflections. A trace is routed from the source terminal of the net to a balanced junction wherein if there are an odd number of load terminals, or loads, the balanced junction is located at one of the loads. The remaining loads are grouped into branches wherein each branch includes an equal number of loads. A trace is routed between each of the loads of each branch to serially connect the loads of each branch together, or, a trace is routed from a center one of the branch loads to each of the remaining branch loads, forming subbranches. In an alternate embodiment, a balanced subbranch is developed. The balanced load is connected to a pseudo-balanced load, which further receives an equal number of branches. The pseudo-balanced load is then connected to another pseudo-balanced load, which may also receive an equal number of branches.

Abstract: An improved data coupler assembly provides an improved electromagnet insert having conductive wires positioned within arcuate channels formed along with electromagnet insert. Sealing means to position and seal the conductor wires to the assembly are included. Improved electromagnetic shielding by using metallic plating on the upper member of the coupler assembly provides effective, but lightweight, EMF/RFI protection. A rugged resilient spring means improves the formation of an electromagnet core by biasing the electromagnet insert, and thereby biasing together each electromagnet pair form cores having a minimal air gap. A quick-action panel mounting means secures the coupler assembly to a panel, and improved aligning means precisely secures the upper member of the coupler assembly to the lower member.

Abstract: An analog line connection circuit provides that the transmission voltage is not superimposed on the received voltage given a data transmission in duplex operation via a two-wire line. The line connection circuit is provided with an amplifier that comprises two symmetrical outputs, the first of these outputs being connected via a first ohmic connecting resistor to a first terminal of a first winding of a transformer and the second output being connected via a second ohmic connecting resistor to a second terminal of the first winding of the transformer. The transformer comprises a second winding connected to a transmission line. A series circuit of a first auxiliary resistor, a complex impedence and a second auxiliary resistor is connected between the outputs of the amplifier.

Abstract: An improved transmission line network includes a transmission line connecting a signal source to a plurality of capacitive loads. Preferably, the transmission line is not terminated with its characteristic impedance. The transmission line may include capacitance added for the purpose of smoothing the rising or falling edge of signals distorted by reflections from the far end of the network. In addition, the transmission line network preferably includes resistance added in series with the transmission line for the purpose of dissipating reflections from the far end and thereby reducing distortion upstream from the series resistors. The capacitive loads may be connected to the transmission line through series resistors, the magnitudes of which are selected to obtain uniform rise or fall times at all loads.

Abstract: A multiple coupler which comprises a low-pass path (VPB) and a high-pass path (VPH) and frequency separation elements comprising a capacitive element C and an inductive element L, whose impedances Z.sub.c and Z.sub.l, respectively, satisfy the relation Z.sub.c Z.sub.l =Z.sub.o.sup.2. The low-pass path comprises a phase inverter INV to enable recombination of the signals without any distortion.