Abstract: A test apparatus for testing such electrical circuit elements as components of printed circuit boards or integrated circuit chips includes a number of substantially indentical pin modules or units, one for each pin under test. The several modules are separately programmed by a CPU to provide a suitable state at the pin under test, i.e., excitation signal, read signal or impedance. Power to the unit under test is provided by the pin module.

Abstract: An arrangement for facilitating the training of personnel in the handling of recoilless rifles which includes an accessory for insertion into the rifle launcher for giving it the same weight and center of gravity as a loaded launcher.

Abstract: A digital power amplifier system includes means providing a signal having predetermined characteristics is digitally synthesized and applied as input signals to a digital symmetrical pulse width modulator. The digital pulse width modulated signals are amplified in a digital or switching power amplifier. The resulting signals are then passed through a tuning or filter circuit to produce an analog signal having the desired frequency and wave shape characteristics which is then applied to a suitable load device. In the thus provided amplification system all of the amplification is accomplished through digital circuitry with no analog influence until the amplified circuits are applied to the tuning or filter elements.

Abstract: A variable line extender for wave guide comprising an elongated electrically conductive housing member and an electrically conductive slide member, the slide member having a convex shaped rounded end and a U-shaped recess extending transversely continuously from one end of the slide longitudinally along one side thereof, around the rounded end, and then along the other side back to the first end, with said housing having a pair of wave guide shaped ports in register with the U-shaped recess of the slide member. Means are provided for adjusting the relative longitudinal position of the slide with respect to the housing so as to vary the length of the path between the ports.

Abstract: A digital power amplifier system features an analog signal which is converted to a corresponding digital signal and is, in turn, applied as input signals in a digital binary format to a digital pulse width modulator. The digital pulse width modulated signals are amplified in a digital or switching power amplifier. The resulting signals are then passed through a tuning or filter circuit to produce an analog signal having a desired frequency and wave shape characteristics. The analog signal is then applied to a suitable load device. In the thus provided amplification system, all of the signal processing and amplification is accomplished through digital or power switching circuitry with no analog influence until the amplified signals are applied to the tuning or filter elements.

Abstract: A shielded keyboard comprising a sheet of flexible fine wire mesh material between an array of keyboard contacts and an apposed array of switching actuators.

Abstract: In combination, intrusion detection apparatus giving a signal when a light vehicle approaches a geophone, and a heavy vehicle discriminator disabling the detection apparatus when the approaching vehicle is a heavy one.

Abstract: Geophone apparatus for receiving seismic signals due to an approaching vehicle, and giving an output when the signals are those characteristic of a heavy vehicle.

Abstract: A hand tool for installing a discharge pin transversely in an insulated wire having a highly stranded central conductor.

Abstract: A compartmented storage container for use in an automatic parts storage and retrieval system comprising a one-piece thin-wall molded plastic body having a rectangular shape adapted to fit within the rectangular rim of a tray, an outside edge portion, an inside edge portion, a bottom portion and at least one transverse divider wall portion, all of said portions being integral with one another and with the transverse divider wall portion having a vertical height measured from a bottom plane less than the vertical height of the outside and inside edge portion.

Abstract: In combination: a system operative to cause an airborne missile to track and impact a point in the wake of a marine vessel in motion; and apparatus for modifying the course of the missile in accordance with the length, velocity and wake formation time constant of the vessel.

Abstract: An inverter circuit having an output power transformer if provided with a replica driver transformer which is a miniature "clone" of the power transformer. The replica driver transformer uses the same core material as the power transformer and is designed to saturate before the power transformer thereby shutting off the drive to the power switching transistors and saving them from burn out which might otherwise be caused by power transformer saturation. Reset circuits can be included as part of the circuit to assure successful start up preventing first-half-cycle-instant-burnout-syndrome occurrence.

Abstract: At a simulation of the visual field of view in the training of a battle situation, a TV-monitor is arranged in the field of view of the optics of a person to be trained. On said monitor a cut-out of a digitally stored background image is displayed. The cut-out to be displayed experiences a containuous change at an aiming motion. The image cut-out is loaded into a buffer memory and with a changed addressing the information in the buffer memory over-lapping with respect to the old and new cut-out is maintained. Only the new digital image information to be added is loaded from the background memory into the buffer memory at the place where the old image information has to be cancelled. Proper addressing takes care that the new buffer memory contents are displayed in the correct logical sequence.

Abstract: At the simulation of a visual field of view for training of a battle situation, the image of the background is displayed on a TV-monitor (16) which is arranged in the field of view of the optics of a person to be trained and moveable targets are cut in in the background image. The background image as well as the target image are digitally stored and are displayed on the monitor after conversion into a video signal. In order to simulate a thermal image on the monitor, the gray scale levels of a daylight video picture of the background image point by image point are treated with an evaluation function which may be obtained for instance by comparing the daylight video picture with a true thermal picture. The thermal image representation of the cut-in targets for instance may be generated by a computer (FIG. 2).

Abstract: In combination: apparatus isolating the chroma information from a quadrature modulated color subcarrier video signal; and apparatus transforming said chroma information into an analog voltage having distinguishable levels uniquely representative of distinguishable hues of the composite signal.

Abstract: In combination: an air core coil; a passive detector connected to said coil for giving a first output in response to change in the ambient magnetic field due to movement of a magnetic body near the coil; an active detector connected to the same coil and operable to create a local magnetic field about the coil and to give a second output in response to changes in the local field due to the movement of the body; apparatus energizing the active detector in response to the output of the passive detector; and apparatus giving a further output in response to simultaneous outputs from both the detectors.

Abstract: A planar varactor tuned microstrip oscillator for Ka band operation comprising a GaAs Gunn diode, a varactor diode, an impedance inverter microstrip line placing the varactor in shunt with the Gunn diode, an impedance matching transformer connected from the output of the Gunn diode to a load connection means, a source of negative bias potential for the varactor and a source of positive bias potential for the Gunn diode.

Abstract: In combination with an actuable means which is adapted to be actuated by the unlocking of an initiation means connected thereto. A velocity sensitive safety link means for connecting a lanyard to said initiation means.

Abstract: A very high hermeticity glass to metal seal comprising a round cylindrically shaped glass member having an outside diameter; a tubular sleeve of resilient metal having (i) a first end with an inside diameter slightly larger than said outside diameter of said glass member, and (ii) a reduced diameter portion adjacent to said first end thereof with the diameter of said reduced diameter portion being slightly smaller than the outside diameter of the glass member; a thin metalized layer on a first end of the glass member adapted to be inserted into said first end of the tubular metal sleeve so as to define an annular gap therebetween, the glass member being inserted as far as possible into the sleeve so that the end thereof is into abutting relation with said reduced diameter portion of said sleeve so as to form a capillary gap therebetween.

Abstract: A firing pin/safety ring for a portable explosive device characterized by the firing pin being positionable in a wide range of angular positions with respect to the plane of the safety ring.