Abstract: In plural channel amplifier systems processing many phase locked signals of different frequencies as a combined signal, these signals may drift into a phase convergence causing a peak power occurrence in the amplifier which greatly exceeds the rated capacity of the amplifier system. Therefore, in accord with the invention, a dynamic adjustment system is provided to minimize the peak power to which the amplifier is subjected by adjusting the relative phase relationships of the many signals. The dynamic adjustment system includes a peak power detector, a hard wired logic decision circuit and a timing control to control phase shift adjustment steps.

Abstract: A microwave splitter/combiner has a flat housing comprising similar top and bottom horizontal circular cover plates joined at their peripheries by an annular flange of short vertical length. The top plate and flange mount on their respective outsides a primary signal transfer coaxial connector and a plurality of secondary signal transfer connectors of which the latter are spaced around the flange. A plurality of first coaxial line sections inside the housing lie in a common horizontal plane and are all coupled to the primary connector and each coupled to a respective one of such secondary connectors, the housing being suitably apertured to permit such couplings. A plurality of second coaxial line sections inside the housing are respectively coupled to such first sections and are all coupled to each other in such fashion as to suppress the appearance at the secondary connectors of extraneous signals.

Abstract: A signal delay assembly for a high power linear amplifier, using feedforward circuitry to reduce distortion, comprises an interdigital delay line unit with included directional couplers. The structure of the interdigital delay line is substantially in a parallelepiped housing. A co-axial connector constructed as an integral part of the delay unit is used for signal connection to the amplifier.

Abstract: A microwave signal splitter/combiner device includes a primary coaxial connector mounted by a first hub and serving as an input/output for a composite signal to or from the device, secondary coaxial connectors radially spaced in a circle around the primary connector and serving as outputs/inputs for individual signals from and to the device, and rigid "first" coaxial line sections positionally fixed through such hub with the primary connector and extending from it to, respectively, the secondary connectors to hold them positionally fixed.

Abstract: A phosphorescent fiber reinforced plastic article comprising a fabric carrying a phosphorescent material encapsulated on a surface of a cured fiber reinforced plastic material made by a variety of processes including, but not limited to, pultrusion, compression molding, filament winding, contact molding, resin transfer molding, a continuous panel process, or structural reaction injection molding.

Abstract: Apparatus is disclosed in which a ring of microwave amplifiers are spaced around the top of a cavity closure structure containing upper and lower splitter and combiner cavities. The inputs and outputs of the amplifiers are connected by, respectively, input and output coaxial couplers to points in, respectively, the splitter and combiner cavities which are spaced radially outward of, and equiangularly around the centers of these cavities. In operation, input microwaves are distributed by the splitter cavity and input couplers to the amplifiers to be amplified by them in parallel, and the several microwave outputs of the amplifies are merged together by the output couplers and combiner cavity to provide a single amplified output. On the upper and lower sides of the splitter and combiner cavities are rigid metal plates with flat surfaces facing towards these cavities, and on the lower and upper sides of the splitter and combiner cavities are sheet metal dishes.

Abstract: A phosphorescent fiber reinforced plastic article comprising a fabric carrying a phosphorescent material encapsulated on a surface of a cured fiber reinforced plastic material made by a variety of processes including, but not limited to, pultrusion, compression molding, filament winding, contact molding, resin transfer molding, a continuous panel process, or structural reaction injection molding.

Abstract: A coaxial coupler unit has an outer conductor fastened to the outside of a first rigid metallic wall on one side of a microwave cavity, and the unit also has an inner conductor having at its front end an axially-fixed, angularly-turnable pin axially extending through a port in such first wall through said cavity to be inserted on the cavity's opposite side in a hole in a second deformable metallic wall bounding such side of the cavity. The pin has helical threads thereon engaging helical threads on the inside of the hole. The pin may, while remaining axially fixed, be angularly turned in opposite directions to displace the deformable cavity wall in opposite axial directions relative to the rigid cavity wall to thereby tune the cavity.

Abstract: A weaving machine alternately lays catalyzed resin wetted fiberglass strands within respective right angle sets of uniformly spaced, open-ended intersecting slots within the upper face of a weaving form by driving reciprocating carriages mounted on rails via rotating wheels across the top of the form bearing said right angle sets of uniformly spaced, open-ended slots. A horizontal base plate supports hydraulic cylinders whose projectable and retractable piston rods suspend a running bar having horizontal apertures through which the fiberglass strands pass. After passage across the form, the running bar is dropped to force the wetted strands into aligned slots. Detents engage the strands at each side of the open slots. A hydraulic rotary motor has a rotary drive shaft in the form of a horizontal threaded rod passing through and engaging the threads of a horizontal tapped bore of a nut fixed to the carriage base plate. The hydraulic motor is rotated bidirectionally to reciprocate the carriages across the form.

Abstract: There is disclosed a cavity closure unit for a microwave amplifier containing smaller and larger diameter, upper and lower, divider and combiner cavities on vertically opposite sides of a central part of such unit and disposed between top and bottom parts, respectively, of such unit, each cavity being bounded on a vertical side thereof by an alternation of concentric ridges and valleys. Improvements for such unit are as follows. The central part includes a discontinuity between upper and lower portions which may be a spatial discontinuity permitting removal from each other of the two cavities. The discontinuity may also be one of materials. The closure unit may have below its top, an outside annular notch of "L" vertical cross section providing a seat for downwardly extending feet on the rear ends of amplifier modules mounted in carousel fashion on top of the unit.

Abstract: A digital communication system has a plurality of channels with distinct carrier frequencies and overlapping bands. Each receiver includes a filter having a time varying bandwidth. The received signal includes at least one carrier modulated by an information signal having a plurality of levels and transitions between the levels at predetermined intervals and components due to other channels. The receiver is synchronized to a selected one of the carriers. The received signal is translated to baseband and applied to the time varying filter which is set to a first bandwidth at the information signal transitions and reduced in the intervals between transitions. The first filter bandwidth accommodates the information signal transitions. Reducing the bandwidth between transitions limits interference components in the time varying filter output when the information signal level is sampled. The technique may be applied to various modulation schemes.

Abstract: Coaxial units are disclosed for coupling an r.f. amplifying microstrip to splitter and combiner wave guides, respectively, of a splitter-combiner apparatus. Each coaxial unit comprises an outer conductor sleeve and an inner conductor pin projecting forward of the sleeve, both the sleeve and pin having forward portions which are resiliently compressible radially inward, and the sleeve being radially enlarged at its front end. The coaxial unit is coupled at its front to its associated wave guide by having its sleeve and pin forward portions, respectively, received in, and radially inwardly compressed in, large and small bores respectively formed in the metallic plates on opposite sides of the dielectric chamber of the associated wave guide. Those forward portions make direct yieldable-pressure electrical contacts with metallic walls of these bores at locations adjacent to the openings of such bores into that chamber.

Abstract: A compression molded fiberglass reinforced resin grating formed of laterally spaced intersecting load bearing bars and cross bars is partially embedded within a layer of sand overlying the floor material of an animal stall defined by a vertical wall enclosure. At least the load bearing bars of the grating have flat top and bottom surfaces with opposite oblique sidewalls which taper towards each other from the bottom to the top. When embedded in the sand with the flat top surfaces exposed, the tapered load bearing bars resist downward movement into the sand layer due to the wider flat bottoms of the load bearing bars. Sand captured between opposed oppositely oblique walls of adjacent load bearing bars is solidly packed therebetween forming with the load bearing bars and the cross bars a solid mass to further resist downward movement, while permitting drainage of liquid waste therethrough. Soiled bedding may be removed from the top of the embedded grating by shoveling.

Abstract: A tensioned grating fastener that includes a deep draft saddle clip of U-shaped configuration that is engagable with a pair of load-support bars of a criss-cross configurated grating, an elongated foot that is provided with a vertical upstanding headed stud which projects through a hole of the saddle clip and a coil spring that is concentrically mounted under slight compression about the stud between the head of the stud and the base of the saddle clip. The depression of the headed stud compresses the coil spring and permits the foot to be rotated from a position in alignment with the saddle clip to a position at an oblique angle thereto, such that one end of the foot is beneath and in engagement with a flange of an underlying grating support member, and the opposite end, beneath and in engagement with one parallel load-supporting bars of the grating.

Abstract: A feed forward circuit receives an input signal having at least one carrier therein in a prescribed frequency range. The input signal is applied to a first circuit path having a power amplifier that produces an output signal with a distortion component and to a second circuit path that delays the input signal without distortion. The output signal of the first circuit path is combined with the output signal of the second circuit path to form a signal representative of the distortion component of the first circuit path output signal and the distortion component representative signal is subtracted from the output signal of the first circuit path to cancel the distortion component therein. The prescribed frequency range of the first circuit path output is scanned to detect a carrier signal and the amplitude and phase of the signal in the first circuit path is modified to minimize the magnitude of the detected carrier in the distortion representative signal.

Abstract: A distortion compensation circuit for power amplifier producing a prescribed distortion component receives an input signal having at least one carrier therein in a prescribed frequency range. The input signal is applied to a first circuit path having an amplifier that produces an amplified signal with the prescribed distortion component and to a second circuit path that delays the input signal without distortion. The output signals of the first and second circuit paths are combined in a first combiner to form a signal representative of the prescribed distortion component. A second combiner forms a signal having an amplified input signal component and inverted phase prescribed distortion component responsive to the output of the first combiner and the output the first circuit path.

Abstract: An automatic gain control circuit for an amplifier operating over a prescribed frequency range detects the output level of the amplifier; and couples a repeated predetermined waveform occurring at a rate greater than the reciprocal of twice the upper frequency of the prescribed frequency range to the output level signal. The waveform varying level signal is compared to a reference threshold to control the gain of the amplifier through a switched resistive elemement in the amplifier feedback path. The repeated waveform variations about the amplifier output level causes the value of the switched resistance to vary as a function of the output level. A low pass filter connected to the amplifier output removes switching transients resulting from the high frequency changes in the switched resistive element. The gains of a plurality of amplifiers may be determined by a common control for accurate tracking over a wide dynamic range.

Abstract: The headed end of a wrench body of elongated rectangular form includes a first stationary jaw defining a first gripping surface. A slide mount foot projects from the body opposite the stationary jaw, and is spaced therefrom. It includes a flat bearing surface. A slidable jaw shoe mounts on the foot, and is slidable towards and away from the wrench body headed end. The shoe has a bite portion forming a second gripping surface which extends parallel to the stationary jaw first gripping surface and faces the same. A straight wire spring has one end fixed within a V-shaped groove which diverges from the stationary jaw within the side of the wrench body towards the foot with the straight wire spring having a free end fitting with an oblique slot within a sliding jaw shoe, permitting the slidable jaw shoe to move in opposition to the bias to ratchet the wrench about a nut or bolt head captured between the first and second gripping surfaces when rotating the wrench body in a first direction.

Abstract: A fiberglass reinforced molded resin grating is formed of first and second sets of mutually parallel, interlocking fiberglass reinforced molded resin bars with the sets extending transversely to one another. One set consists of bearing bars of rectangular cross section including at longitudinally spaced positions within an upper edge, inverted U-shaped notches including oppositely directed, downwardly and outwardly oblique slots terminating at their upper ends adjacent the upper edge of the bearing bars in upwardly and outwardly diverging oblique cam surfaces. The second set of bars consist of cross bars of inverted U-shaped cross section including a horizontal base portion and a pair of downwardly and outwardly diverging legs of a thickness equal to the width of the diverging slots and being respectively received in said slots.

Abstract: A multiband antenna mounting and feedline coupling arrangement includes a first transmission line segment secured in a mounting device for the antenna for coupling energy to and from the antenna. A second transmission line segment, extending, e.g., to grounded high band equipment, provides high band signal coupling with the first line and includes a direct current blocking capacitor in series in the ground return path of that second line segment, the capacitor having such a low impedance to high band energy that it presents negligible impedance to such energy. A third transmission line segment provides low band signal coupling with the first line by way of a part of the ground return path of the first line. A high band quarter wave, in the high band, filter stub transmission line is connected between the signal and ground return paths of the third transmission line adjacent to the point of coupling thereof to the first line.