Spx Corporation

General Signal Corporation

Jeffrey M Brown

John L Schadler

Andre Skalina

William A DeCormier

Cole Nason Plummer

Richard I Bibber

Henry Downs

Gordon Eaton

A dual-port IBOC&#xae; antenna provides omnidirectional radiation of orthogonal, circularly polarized analog (FM) and digital (OFDM) signals using quadruple coplanar square loops driven from a hybrid having balanced outputs. The loops are arranged in a tiled square, with proximal sides functioning as further stripline hybrids to cancel cross coupling between the loops. Each loop quad is reflector-backed and emits a directional signal; multiple loop quads oriented radially form an omni bay. Vertical spacing between bays includes a minimum position for mutual coupling, while symmetry establishes uniform input impedance on the hybrid input ports. Tuning barbs on the loops fine tune frequency response. Bandwidth is wide, so that a single antenna can radiate multiple FM analog and hybrid IBOC&#xae; channels over the VHF FM radio broadcast band.

Antenna system and method to transmit cross-polarized signals from a common radiator with low mutual coupling

A monitoring system for an RF transmission system, such as a multi-channel television broadcasting antenna feed system, gathers data about the physical and electrical condition of the RF transmission system in real time. The system can detect and localize deterioration and other time-dependent faults in the transmission system by the tendency of faults to produce reflections back to the transmitter that were not part of the original characterization of the installation. Some kinds of faults, identified early enough, can be corrected without replacing components, and especially without shutting down the transmission system during prime viewing hours in the case of television broadcasters, or during a critical period of use of the system in the case of other user types. Other faults can be detected in time to order replacement parts before the underlying problem becomes severe, and to allow servicing during periods of low demand.

Apparatus and method for monitoring transmission systems using embedded test signals

A system and method is provided for transmitting analog and digital signals using a single traveling wave structure with radiators attached thereto, to form broadside radiation of the digital and analog signals.

Dual feed common radiator antenna system and method for broadcasting analog and digital signals

A monitoring system for an transmission line, such as a multi-channel television broadcasting antenna feed line, gathers data about the physical and electrical condition of the line in real time. The system can detect and localize deterioration and other time-dependent faults in the transmission line by the tendency of faults to produce reflections back to the transmitter that were not part of the original characterization of a particular installation. Some kinds of faults, identified early enough, can be corrected without replacing components, and especially without shutting down the transmission line during prime viewing hours. Other faults can be detected in time to order replacement parts before the underlying problem becomes severe, and to allow servicing during periods of low demand.

Apparatus and method for monitoring transmission systems using off-frequency signals

A coaxial transmission line having intermediary segments of equal lengths and equidistant insulator supports is provided. The transmission line segment and insulator support spacing is designed to cause any reflection artifacts to occur outside or between desired channel bands.

Broadband coaxial transmission line using uniformly distributed uniform mismatches

An support for coaxial transmission lines is described, having a reduced mass and being configured to reduce bending stresses when subject to insertion or axial load effects.

Inner conductor supports for rigid coaxial transmission lines

A plate has an iris defined by an aperture, and a rod extending radially outward from the iris through the plate. The rod is radially adjustable and a sleeve is disposed on the rod, for tuning the plate by slidably adjusting the rod radially.

Tunable coupling iris and method

A broadband coaxial transmission line is formed by joining smaller coaxial transmission lines having particularly formulated lengths. Insulating supports in the transmission line are situated in a prescribed manner to reduce reflections along the transmission line. The insulating supports are also formed with particularly positioned symmetric voids to minimize weight, provide adequate structural support, and minimize reflections.

Broadband rigid coaxial transmission line

A low noise compressor is realized, involving a port and manifold assembly, and in which a reactive silencer means is formed integrally within the assembly and coupled acoustically with at least one of the input and output manifolds, the silencer including a pair of resonant cavities configured so as to attenuate at least the first overtone of the fundamental frequency.

Noise reduced liquid sealed compressor

A process and system which provides for the heatless or pressure swing fractionation of a gaseous mixture which comprises first and second fractionation columns containing appropriate adsorption materials, together with heat exchangers, and especially featuring a compressed gas pressure powered motor driving a compressor so as to recover energy released due to the pressure reduction in one of the process flow streams.

Growing community of inventors

Windham, ME, United States of America

Jeffrey M Brown