Abstract: A method and circuit for locating an arc in a waveguide which utilize detectors responsive to the vibratory and electromagnetic disturbances resulting from an arc. Since the disturbances travel at different velocities, the location of the arc can be readily determined. A counter counts time periods between the time of detection of the electromagnetic disturbance and the time of detection of the vibratory disturbance. The length of the time periods is selected so that the quantity counted may be directly displayed as the distance to the arc location.

Abstract: An electronic display indicator system for automotive vehicles wherein a single visual display unit is utilized to display the outputs of a plurality of sensing devices. The indicator system is manually activated to display the outputs of the sensor devices in sequence. Any given sensor device output is automatically displayed when the output thereof exceeds a predetermined value.

Abstract: In the radar device, the received signal is down-converted with three different signals prior to speed evaluation, so that three signals having different amplitudes are available for speed evaluation. Only the signal having the greatest amplitude is then evaluated, and this amplitude is always sufficiently great.

Abstract: A demountable plug/socket connector assembly for making an electrical connection across a high pressure differential between the surfaces of a bulkhead such as the housing wall of a submarine repeater. One sub-assembly, ordinarily the socket sub-assembly is mounted in a bore or aperture on the low pressure side of the bulkhead, the mounting being resilient so that a small amount of engagement overtravel of the mating plug sub-assembly inserted through the bore resiliently disengages a seal between the socket member and the bulkhead to permit the inert gas on the low pressure side of the bulkhead to flow into the interface volume surrounding the pin/socket connection effected by mating of the plug/socket assembly. A second seal enables as the plug member is firmly seated, to exclude the high pressure medium (sea water for example) from entering the interface volume. The operation of the seals is reversible upon detachment.

Abstract: A polarization-agile radar array employing at least one linear array having a periodic first meander line and a second meander line which is a close-spaced, mirror image of the first such line, these lines being separately driven so that when they are fed with equal amplitude and phase, the polarization will be in a first plane and when driven in anti-phase, orthogonal polarization is achieved. The meander lines extend in the same plane which is parallel to a ground from which it is spaced. Intermediate polarization angles are achieved by intermediate phase and amplitude relationships of the drive, equal amplitude and phase quadrature exitation providing circular polarization. A series of generally parallel, conductive vanes is affixed to the ground plane to compensate for the reactance of longitudinal sections of the meander line longitudinal feeder (connecting) sections as the wave passes therethrough when its polarization is essentially parallel to those feeder lines.

Abstract: An electronic two-dimensional scanning array system with a two-dimensional interferometer array arrangement associated therewith is disclosed. The scanning array is used for transmitting a pencil beam, and the interferometer arrays are employed in receiving, array signal processing also being employed. The azimuth interferometer array consists of two sub-arrays, one on each side of the scanning transmitting array. The elevation interferometer array is likewise divided into two sub-arrays, one across the top and the other across the bottom of the scanning transmitting planar array. Accordingly, null responses in azimuth and elevation are provided. Phasors, which may be controlled by tracking functions, steer the center and nulls of the interferometer receive beam together in such a manner that the maximum improvement of the ratio of array-signal-process received target power to received power from an interfering source angularly separated from the interferometer center beam is achieved.

Abstract: Method apparatus for manufacturing commutators, especially for small electric motors. Commutator segments are separately inserted into a mold intermediary plate. The segments are inelastically deformed by a coaxially inserted tool before the molding process. The formation of webs of the injected plastic body material between commutator segments is avoided.

Abstract: A multiwire conductor in which a layer of wires surrounds a center wire. The center wire has a predesigned structure which produces many small, negligible kinks instead of few intolerable ones, which may otherwise occur as the result of temperature changes or stress variations.

Abstract: A machine for performing cutting, roll-grooving and like operations on pipe or tubing. A pneumatically operated head assembly provides for rapid tool advancement to a first predetermined position short of work engagement and hydraulically cushioned advancement therefrom to work engagement. A captive oil supply flow freely through poppet valves which close at first predetermined tool position, and at a controllable rate through a needle valve between the first and second tool positions. Automatic poppet reset occurs for rapid tool withdrawal, readying the apparatus for recycling.

Abstract: A compressive receiver for developing a series of time-based identifying pulses corresponding to discrete received signals having various frequencies within a predetermined band of surveillance. A multiple local oscillator function is included, effectively dividing the predetermined band of interest into small frequency increments, each of these local oscillator signals being coded by a pseudo-random coded sequence (bi-phase code) of maximal length. Each frequency increment thus developed is coded by this sequence delayed by one bit duration as compared to that applied to the local oscillator frequency immediately preceding it. A mixer receiving input signals in the band of interest, and also the multiple local oscillator signals thus generated and coded, has its output processed by a passive correlator which provides pulses at times determined by the frequencies extant in the input signal.

Abstract: A radio frequency power divider/combiner having a pair of conductive plates between which the dominant E-type mode is produced by symmetrical excitation at a central point preferably by means of a coaxial line having its outer conductor attached to the first of these plates, and its inner (center) conductor passing freely therethrough and attaching to the second of these parallel plates in an impedance matching flareout. A plurality of uniformly distributed collectors each in the form of a loop feeding the coaxial branch port provides for low loss. The entire assembly is in the form of a thick disc with radially extended branch ports about its perimeter and a common excitation feed extending normally from the surface of the first plate. Resistors are provided between adjacent portions of the end-on loops for the suppression of circumferential current components corresponding to undesired modes.

Abstract: Disclosed is a Sidelobe Rejection Filter for reducing the time sidelobes seen in the auto-correlation output signals from a matched filter. Such matched filters are used with radars utilizing pulse compression techniques, for example. The sidelobe rejection filter may be utilized whenever the time response of the auto-correlation signals includes a plurality of sidelobes each having a period .tau. and having essentially the same amplitude. Accordingly, the disclosed sidelobe rejection filter is particularly useful for pulse compression radars employing linear FM (i.e., Chirp) or Barker phase coded waveforms.The matched filter includes a delay circuit coupled to receive the time response of the auto-correlation signal, which delay circuit inserts a delay of .tau.

Abstract: A cable termination between a main coaxial cable and apparatus, such as a repeater housing. The outer conductor of the main cable is shielded by an effectively continuous tube of electrically conductive material extending from the end of the outer conductor of the main cable to the housing apparatus. A flexible bellows assembly can be used at the end of the tube connected to the repeater housing to accommodate relative movement between the cable and the repeater housing during installation.

Abstract: An annular rotary antenna feed coupler especially for around-the-mast use, as on shipboard. A housing in the general shape of a cylinder with a central axial opening essentially concentric with the axial center line of the housing contains a circumferential distribution of a number of fixed axially elongated, conductive loops each with a feed port. Radially spaced therefrom, a second, group of elongated conductive loops circumferentially distributed about a circle of different radius as compared to the aforementioned fixed loops is rotatably mounted. A corresponding plurality of ports, one for each rotating loop, is also provided, and input and output combiner/divider devices, one for the fixed and another for the rotating sub-assemblies serve to combine all ports into a single fixed and a single rotating port. Mechanically, the rotating combiner/divider rotates with the antenna array with which it operates.

Abstract: A fiber reinforced composite structure for slotted type waveguide antenna, comprising at least one layer of conductive material applied over a mandrel by a known method. Radiating element slots are provided during this process and a laminate of low RF loss material is applied in layers of cloth made from aromatic polyamide fibers having a major fiber direction. A binder material, for example, an epoxy resin is applied and cured thereon as the layers are applied. Alternate cloth layers are applied with the major fiber direction rotated 90.degree.. When the laminate is partially completed, two flanged stiffening ribs are typically placed longitudinally on the top and bottom of the waveguide structure along the surfaces other than that containing the slots. Additional layers of the laminate cover the stiffeners and thereby produce integral mounting structures.

Abstract: An improved and modified hybrid-ring coupler using distributed, quarter-wave length, tuning element to achieve the proper phasing between signal paths. Extra line lengths have been added to accommodate the addition of a third port so the device is a three-way combiner/divider. Two isolation ports accommodating external isolation resistors are provided. Instrumentation is preferably in microstrip medium.

Abstract: A rotary annular, around-the-mast, radio frequency coupler having two concentric sets of generally axial loops, one fixed (stator set) and the other rotatable (rotor set) for electromagnetically coupling between a fixed and rotatable structure, such as a rotating antenna sub-system.Two methods and corresponding structure are provided for reducing the power transfer ripple occurring during rotation. These are prime related different loop totals between rotor and stator and angular canting of one loop set with respect to the other.

Abstract: An electronic trigger circuit for an RF source, which electronic trigger may be advantageously used in a radar apparatus, for instance. The trigger employs digital logic devices including a register or counter, a circuit for initiating counting in the register in response to a received pretrigger signal and a circuit responsive to the occurrence of selected count in the register for enabling the RF source. A timing signal is generated, based upon the pretrigger signal in timed relationship to the time at which the RF source should nominally generate its RF signal. Typically, the RF source generates its RF signal at sometime after being enabled. A comparator circuit is provided for comparing the phase relationship of the aforementioned timing signal and the occurrence of the RF signal and is in turn coupled to an arithmetic circuit effective for altering the number of states through which the register counts.

Abstract: A water-tight termination of a coaxial submarine cable to a tail cable including a piece-part polyethylene molding over a polyethylene/copper/polyethylene laminate and continuity braid. Applied heat externally bonds the laminate to a plastic internal core forming the dielectric and to the piece part to form a water barrier.

Abstract: An integrated planar antenna array comprising at least two separate interleaved arrays separately controllable and responding to separate frequency bands. Both arrays operate with substantially the same phase center and substantially within the same effective aperture. The first array or subarray comprises spaced linear, slotted-waveguide arrays and the second subarray includes a meander line occupying the space between each of the waveguides of the first array. Scan systems are shown for independent operation of the two arrays. An alternative for the second subarray is shown in the form of slotted, square-coaxial, linear arrays in the spaces between the waveguides of the first subarray.