Abstract: A step attenuator circuit is mounted on a printed circuit board and has a highpass filter network passing high frequency signals and a lowpass filter network passing low frequency signals. The lowpass network presents a high shunt reactance to the high frequency signals. The lowpass network includes an attenuator network. The attenuator network attenuates the low frequency signals by a specified amount. Parasitic capacitance exists between the highpass network and the attenuator network, causing an amount of electrical energy from the high frequency signals to be absorbed by the attenuator network. A first capacitive circuit is used to compensate for parasitic capacitance. The first compensation circuit is connected across the attenuator network and is coupled to the parasitic capacitance. Consequently, the amount of electrical energy from the high frequency signals absorbed by the attenuator network is reduced, and, as a result, the insertion loss of the step attenuator is reduced.
Abstract: A system and method to range a distance to a source of CPD on a two-way cable system, comprises a fixed CW signal injected into a downstream signal path, a swept signal transmitted from a network analyzer, a mixer for generating an up-converted swept signal, and a source of CPD in the two-way cable system that mixes the fixed CW signal and the swept signal to create an upstream swept signal. The network analyzer receives the upstream swept signal and determines a complex frequency response created by the source of CPD. An impulse response is determined from the complex frequency response, and the distance to the source of CPD is determined from the impulse response.
Abstract: A system for pinpointing CDP sources in a two-way HFC CATV network comprises a headend CPD radar unit, a return path switch, and a computer. The radar unit is coupled to a headend combiner. The return path switch is coupled between the nodes of the CATV network and the radar unit. The computer is connected to the radar unit and the return path switch. The computer controls the radar unit and switch and causes them to perform constant sequential CPD monitoring of the nodes of the network. The system further comprises a portable radar-calibrator unit that is carried into the field and connected to various points along the coaxial cable portion of the network. The portable radar unit is used to detect CPD sources in the field and to calibrate the network as to time delay. The portable unit communicates with the headend radar unit through the CATV network.
Abstract: A system and method to range a distance to a source of CPD (Common Path Distortion) on a two-way cable system, comprising a local CPD source and a cross-correlator. The local CPD source generates a local distortion signal from a downstream signal, wherein the downstream signal includes multiple carriers of TV channels. The source of CPD in the cable system mixes the carriers of the TV channels to create an upstream actual distortion signal. The cross-correlator performs a cross-correlation between the local distortion signal and the upstream actual distortion signal to create a cross-correlation plot, and the distance to the source of CPD is determined from the round-trip time.
Abstract: An organizer cover, comprising first and second cover panels and a spine, an external surface, at least one organizer element, and at least one concealment flap. The spine is operatively coupled between the first and second cover panels. The first and second cover panels and the spine each have an exterior. The external surface includes the exteriors of the first and second cover panels and of the spine. The organizer element is located on the external surface of the cover. The concealment flap is connected to the external surface and manually positionable between a closed position against the external surface and an open position. The concealment flap is located and configured to conceal, at least in part, the organizer element when the flap is in the closed position. Neither the external surface nor the organizer element includes thereon any means for securing the concealment flap in the closed position.
Abstract: A host organizer includes a casing, a pocket, and an organizer flap. The pocket is located on the exterior surface of the casing. The pocket contains a first attachment element. The organizer flap extends from the casing and over the pocket. The flap has a second attachment element. The second attachment element is complementary to and alignable with the first attachment element, such that the flap is releasably attachable to the pocket. An ancillary article includes a body and an article flap. The article flap contains third and fourth attachment elements. The third attachment element is complementary to the first element, and the fourth attachment element is complementary to the second element. The body is configured to fit in the organizer pocket. The article flap is adapted to overlap the organizer pocket such that the third and first attachment elements are aligned and the article flap is releasably attachable to the organizer pocket.
Abstract: A desk organizer tray, comprising a tray portion, an extension portion extending from the tray portion, and an attachment element applied to the extension portion. The tray portion contains a receptacle for holding desktop items. The tray portion is constructed of a plurality of superimposed board members, each of which contains a hole pattern. The hole patterns of the board members are in registration with one another to form the receptacle. The extension portion includes a board member that extends from the tray portion. The board members of the tray portion are mounted on the board member of the extension portion. The attachment element is applied to the board member of the extension portion. The attachment element serves to attach a desk pad to the extension portion, adjacent to the tray portion.
Abstract: An electronic filter assembly comprises a housing, first and second circuit board surfaces, first and second cable TV filter circuits, a ground plane, and first and second electrical terminals. The housing includes first and second cable connectors in opposed relation to each other and contains an interior volume. The circuit board surfaces are in superposed relation to each other and engage the housing within the interior volume. The circuit board surfaces face away from each other in opposite directions. The cable TV filter circuits are mounted on the circuit board surfaces, respectively. The ground plane is disposed between the circuit board surfaces. The ground plane contacts the filter housing within the interior volume. The electrical terminals are coupled to the filter circuits. The first terminal extends into and is supported inside the first cable connector, and the second terminal extends into and is supported inside the second cable connector.
November 25, 2003
Date of Patent:
May 3, 2005
Arrow Communication Laboratories, Inc.
Andrew F. Tresness, Martin L. Zelenz, Jerry M. Gould
Abstract: The vehicle disabling system includes a vehicle control unit for positioning in a vehicle with a transceiver for transmitting and receiving signals to receive an inquiry signal and transmit an identification code upon the receipt of the inquiry signal. A central database station includes memory for storing a plurality of identification codes of vehicle control units. An authorization code is associated each identification code. A mobile law enforcement unit is positionable in a law enforcement vehicle, and includes a transceiver for transmitting and receiving signals to transmit the inquiry signal to a vehicle control unit. The law enforcement unit receives an identification code from the vehicle control unit and transmits the identification code to central database station. The law enforcement unit transmits the stop signal with the authorization code to the vehicle control unit upon receiving the authorization code from the central database station.
September 15, 2000
Date of Patent:
March 29, 2005
Joseph P. Ligoci, Sr., Elias J. Goletsas
Abstract: An electronic filter assembly of the type that includes a female terminal cap having a fitting portion and containing a terminal passage through the fitting portion, and a collet assembly secured in and substantially closing the terminal passage of the female terminal cap. The collet assembly comprises an insulator, a collet terminal, and a seal. The insulator is made from a single piece of insulator material, containing a bore therethrough. The collet terminal extends through the bore of the insulator. The seal is located inside the terminal passage of the female terminal cap, between the collet terminal and the female terminal cap.
Abstract: A multi-battery charging system for reduced fuel consumption and emissions for an automotive vehicle. The system starts the vehicle with a start battery in a fuel savings manner, removing electrical torque from the alternator shaft, and allows a second (run) battery to provide all or some of the current required by the vehicle loads as a fuel savings measure. The system also utilizes an electrically heated catalytic converter (EHC) and a third (EHC or storage) battery to provide a 3 to 15 second preheat and/or a 20 second current, during vehicle start, to the EHC heater coil, e.g., of a small EHC located in series with a standard catalytic converter for emissions reduction to reduce emissions during start. The start battery is recharged after start and switched out of the system fully charged for future vehicle starts.