Abstract: A projection apparatus is provided which produces a heads-up display in a helmet of the type commonly worn by a pilot. The projection apparatus includes a thin-film electroluminescent source having an edge emitter device provided therein. The edge emitter produces a linear signal which is transversely deflected by a scanner to produce an image on a display area. Preferably, the display area is provided on the face plate of a helmet worn by the pilot.

Abstract: An improved power saving drive circuit is provided for a multiplexed thin film electroluminescent (TFEL) array having a number of edge emitter devices. The drive circuit includes a charge circuit and a discharge circuit operatively connected to a load capacitance. Although the charge and discharge circuits may contain common elements, the discharge circuit usually has fewer windings than the charge circuit. A voltage regulator is provided to maintain the voltage on the load capacitor during the interval between charging and discharging thereof.

Abstract: Planar millimeter wave transceiver includes a plurality of patch antenna elements disposed on a substrate in right and left hand circular polarization. Microstrip feeds having an intermediate feed point, interconnect adjacent elements. First switches interconnect with the feed points of adjacent feeds and are alternately operable between first and second states for establishing azimuth and elevation. Second switches interconnected with the first switches are alternately operable between first and second states for establishing transmit and receive modes for the antenna and with phase compensation. The microstrip feeds, and the first and second switches are interconnected on the substrate without crossovers. Transmitter and receiver elements may also be incorporated onto the substrate to form an integrated transceiver.

Abstract: A series impedance compensation system for a set of transmission lines which are used for electrical power transmission, with these parallel lines being protected from the transient faults and dynamic subsynchronous oscillation problems. These problems can become aggravated by the introduction of capacitor banks which thus serve as only a partial solution to the disturbances of transient faults during conventional recovery modes of operation. The impedance compensation system is coupled in series to each transmission line to dynamically balance the inductor impedance on the transmission line, responsive to demand, by injecting a voltage component determined to be optimized substantially at quadrature leading or lagging phase angles (.+-.90.degree.) with respect to the transmission line voltage and current components.

Abstract: A combined antenna system mounted in a nose randome of an aircraft for both radar and ESM signals. A flat plate waveguide antenna, a twist panel, a selective reflector, and a feed are aligned along a longitudinal axis in the randome. The polarized electromagnetic energy is twisted 45 degrees; and the selective reflector passes the twisted electromagnetic energy and reflects energy polarized in planes substantially different than the twisted plane.

Abstract: A composite brush to shunt attachment wherein a volatile component of a composite but mostly metallic brush, used for current collection purposes, does not upon welding or brazing, adversely affect the formation of the interfacial bond with a conductive shunt which carries the current from the zone of the brush. The brush to shunt attachment for a brush material of copper-graphite composite and a shunt of copper, or substituting silver for copper as an alternative, is made through a hot isostatic pressing (HIP). The HIP process includes applying high pressure and temperature simultaneously at the brush to shunt interface, after it has been isolated or canned in a metal casing in which the air adjacent to the interface has been evacuated and the interfacial area has been sealed before the application of pressure and temperature.

Abstract: A programmable termination device includes an insulating body member and a plurality of pins to be inserted into an integrated circuit board. A plurality of circuit terminating elements are provided in the insulating body member, and a plurality of programmable fuses are provided for selectively connecting each of the circuit terminating elements to, or isolating each of the terminating elements from, the corresponding pins. The programmable fuses can be "blown" or left "intact" to program the device into the desired terminating configuration. An integrated circuit is "piggy-backed" over the programmable termination device into the same holes of the integrated circuit board as the pins of the programmable termination device.

Abstract: RF manifolding for a radar antenna which allows tight spacing of Phase Control Modules (PCMs) is disclosed. The manifolding consists of ridged branch manifold waveguides to which ridged cross waveguide sections are installed. Each branch manifold waveguide of the present invention has ridges on one broad wall, coupling slots on another broad wall, and a plurality of cross waveguides connected on the side having the coupling slots. The cross waveguides are likewise provided with ridges on one broad wall, which are oriented at right angles to the ridges of the branch manifold waveguide, and have coupling slots on the opposite broad wall which correspond to the coupling slots of the branch manifold waveguide. The PCMs are mounted on the end of each cross waveguide, parallel to the ridges thereof.

Abstract: A wound thin film capacitor is formed by the method of applying a solution of a metal-organic alkoxide composition to at least one flat surface of an electrically conductive metal strip and heating the coated strip so as to remove the organic component of the metal-organic alkoxide composition and produce a thin, electrically non-conductive metal oxide film on the flat surface. The metal strip with the metal oxide coating is then wound on a spool to form a wound thin film capacitor.

Abstract: A method and apparatus are disclosed for providing optimum radar beam patterns to provide complete radar coverage at both short ranges and long ranges in a radar system using solid state transmitters. Long pulses for covering long ranges are generated and split into a pair of signals with a specific amplitude and phase relationship. These signals are provided to a transmit beam forming matrix of an array antenna to generate an optimum pattern for long range coverage. Short pulses are generated for providing short range coverage and are split into a pair of signals which are phase shifted differently from the long pulses. These signals are then provided to the transmit beam forming matrix to generate a different beam pattern for providing short range detection. The short range beam pattern has a sufficient amount of energy to provide coverage to maximum desired altitude over a range extending to where echoes from the long pulses may be received undistorted.

Abstract: An acousto-optic spectrometer/polarimeter for analyzing an incident broad-band beam including an acousto-optic tunable filter (AOTF) for separating the incident broad-band beam into a diffracted extraordinary narrow-band beam, a diffracted ordinary narrow-band beam, and at least one undiffracted broad-band beam; first, second and third detectors respectively positioned to respectfully receive at least a portion of the diffracted extraordinary narrow-band beam, the diffracted ordinary narrow broad-band beam and the at least one undiffracted broad-band beam, and to respectively provide first, second and third signals based thereon; a subtracter for providing a polarimeter output by taking the difference between the first and the second signals; and an adder for providing a spectrometer output by adding the first and the second signals.

Abstract: In a local area network all communication nodes are connected only to a centrally located star network coupler, but data is transmitted from one communication node to the next active communication node in a sequence defined by a ring protocol. The star network coupler may be implemented by switches capable of connecting a receiver for one communication node to a transmitter for the next communication node or to a bypass line for the next communication node. However, preferably the star network coupler comprises a selective multiplexer for each of the nodes. Each selective multiplexer has inputs connected to all of the communication nodes to receive therefrom transmission data and a line status signal indicating communication activity with each node so that inactive nodes can be bypassed.

Abstract: A power saving voltage drive circuit for a TFEL edge emitter device of the type having a plurality of pixels, with each pixel having a first terminal and all pixels on a device sharing a common second terminal, is comprised of a demultiplexing channel driver being selectively connected to the second terminal. A bidirectional switch selectively connects one of the first terminals to a source of voltage thereby enabling current to flow into and out of the pixel. A transformer has a primary winding connected between the first terminal and the bidirectional switch for enabling the pixel to charge to an operating voltage, and a secondary winding connected in series with a diode across the source voltage and ground for limiting the value of that operating voltage. The bidirectional switch is operated so that a substantial portion of the energy used to charge the pixel is returned to the source of voltage at the end of the pulse duration.