Abstract: Improved gain control in a photomultiplier tube having a plurality of dynode stages is achieved through manual or automatic change of the bias voltage on at least one of the several dynodes between the anode and cathode of the tube. By such means, maximum tube gain change is obtained with a minimum of bias voltage swing.

Abstract: A frequency synthesizer has in series a digital synthesizer, mix and divide circuits, and a mix only circuit. Each mix and divide circuit includes a mixer having an IF input, a LO input and a RF output, a filter, and a frequency divider. A segment of a digital word selects a tone from a tone generator and also selects a passband of the filter. The selected tone is coupled to the LO input of the mixer. The frequency divider divides the filtered RF output of the mixer. The mix only circuit is at the output of the last of the series connected mix and divide circuits. The mix only circuit is similar to a mix and divide circuit, but does not have a frequency divider. The digital synthesizer provides a signal to the input of the first of the series connected mix and divide circuits, the frequency of which corresponds to a segment of a digital word. The filter is preferably a voltage tunable bandpass filter.

Abstract: A telecommunication system for synchronizing a digital bit stream sent from a central facility to a terminal on lines of television frames. Each active line starts with a horizontal sync pulse and a color burst. A first data clock at the central facility provides first data clock pulses synchronized with said color burst. A circuit at the central facility provides a flag bit one clock pulse wide delayed by a first constant number of clock pulses from the start of the line's horizontal sync pulse. A second data clock at the terminal provides second data clock pulses synchronized with said color burst. A circuit at said terminal provides a time window delayed by a second constant number of clock pulses from the start of the line's horizontal sync pulse so as to bracket said flag bit. A plurality of second data clock pulses occur during said time window.

Abstract: A printed circuit module retainer has two linear guides which are channeled to accept edges of printed circuit module. A serpentine spring transverses each channel to retain an inserted module.

Abstract: A crossed log-periodic dipole antenna having a unique feedline/boom structure providing improved antenna performance. The antenna is assembled from a pair of orthogonally displaced log-periodic antennas each having a pair of half-dipole structures, each structure having a half-dipole assembly and a central feed boom. The half-dipole assembly comprises a single sheet of conducting material formed to provide a central boom portion and a plurality of half-dipole elements projecting radially from opposite sides of the boom. The boom portion has a reduced thickness, a shape which complements that of the outer surface of the boom, and is press-fitted against and bonded to the boom exterior to form an integrated rigid unit. This configuration minimizes the force required to connect each half-dipole assembly with the adjacent boom, decreases the offset distance between the two dipole halves of each antenna, and reduces the electrical shadowing effect of the booms on the antennas.

Abstract: A telecommunication system for transmitting video and plural audio information on a transmission medium includes a facility and an addressable terminal. The facility includes arrangements for providing addressed video frames containing information corresponding to still images and for providing addressed audio frames containing information corresponding to audio bursts. There is also means for providing non-addressed signals containing information corresponding to at least one channel of continuous audio. The addressed video frames, addressed audio frames, and non-addressed signals are coupled to the transmission medium and sent to the terminal. The addressable terminal includes means for detecting said addressed video frames, addressed audio frames, and non-addressed signals on said transmission medium. Circuits select video frames and audio frames in response to their corresponding addresses.

Abstract: A telecommunication system has a facility and an addressable terminal coupled through a transmission medium. The facility includes means for providing addressed video frames containing information corresponding to still images and for providing addressed audio frames containing information corresponding to audio bursts. There is also provided for non-addressed signals containing information corresponding to at least two channels of continuous audio. A selection code is inserted in one or more of the frames. The addressed video and audio frames and non-addressed signals are coupled to the transmission medium to the addressable terminal. The terminal has means for detecting said addressed video frames, addressed audio frames, and non-addressed signals. Circuits select video frames and audio frames in response to their corresponding addresses. One of said continuous audio channels is selected in response to said selection code.

Abstract: A system for rapidly scanning a remote field of regard with transmitter laser beams comprises an optical system having a focal plane, a plurality of lasers capable of being sequentially fired, and a like number of optical fibers coupled at one end to the respective laser outputs. The opposite fiber ends lie in the focal plane of the optical system and are aligned in the direction of the height of the field of regard. The beams move rapidly across the width of the field of regard simultaneously with sequential operation of the lasers, thus illuminating the entire area of interest in a minimum of time.

Abstract: A method of soldering leadless component carriers or the like to printed circuit boards uses a solder paste containing copper spheres in addition to particulate solder and flux. The solder is melted and the copper spheres are embedded in the resulting solder matrix, offsetting the carrier from the printed circuit board.

Abstract: A liquid electrolyte solution is added to porous components of an electrochemical cell prior to assembly. The electrolyte solution is frozen and all the components are assembled into a sealed cell. The electrolyte solution is then allowed to melt.

Abstract: In a log-periodic monopole antenna array of the type described in U.S. Pat. No. 3,286,268, each antenna of the array having active elements spaced over the top surface of a ground structure and grounded parasitic elements interspersed between the active elements, the improvement of means for mechanically and electrically connecting the parasitic elements to a non-solderable ground structure comprising an elongated block compressed into a correspondingly shaped groove in the structure. Screw means threadedly engage the ground structure in a direction transversely of the top surface thereof and abut against the block. The lower strip portion of the parasitic elements is disposed in the groove between the block and a groove side wall and is compressed therebetween when the screw means is tightened into the structure and against the block.

Abstract: A two-dimensional image and energy profile of the output from a pulsed laser is analyzed on a pulse-by-pulse basis by a video graphics image processing system coupled to a minicomputer. An intensity distribution in psuedo color for the full beam is formed by the processor and displayed on a color monitor in real time. The minicomputer performs analytical measurements in two dimensions on the beam shape and size as well as on the pulse timing properties of the laser. The system serves as a real time diagnostic tool for laser development.

Abstract: The foreshortened dipoles of the antenna described in U.S. Pat. No. 3,732,572 are further substantially shortened without performance impairment with a new construction in which each radiating element comprises a planar rectangular body electrically connected to the feed line by a stem attached to the body remotely from the feed line and spaced slightly from the plane of the body.

Abstract: A battery has first and second polarity circular electrodes within a circular housing. At least one bipolar electrode is interposed between the first and second polarity circular electrodes. Porous separators are located between electrodes. The cell also includes an electrolyte solution. Electric current is coupled from the first and second cylindrical electrodes.

Abstract: A mechanical component for electrochemical batteries having porous members. A disc has two or more circular grooves in one side. The grooves are intended to accept the porous members and an electrode member of the battery. The opposite side of the disc has one or more radial channels which intersect with the circular grooves. When used in a battery, the component facilitates distribution of electrolyte, while also minimizing electrolyte leakage between cells.

Abstract: A solder paste contains solder plated copper spheres in addition to particulate solder and flux. The paste can be used to solder leadless component carriers or the like to printed circuit boards., After melting the solder, the copper spheres are embedded in the resulting solder matrix, offsetting the carrier from the printed circuit board.

Abstract: Local oscillator power is supplied to an array of single-ended microwave mixers by an offset horn. Each mixer has an integral antenna element.

Abstract: A hand-held tool having an elongated rod-like body with an arcuately-shaped head tapered to a rounded point for use in removing insulated wires from the end of a braided shielded cable. The tip is intentionally rounded to prevent puncturing the insulation or catching on the braided wires when the tip is inserted between the wire insulation and the shield. The outer 1/2 of the tapered head portion has a substantially elliptical cross section, as opposed to simply circular, to distribute the load bearing forces across a greater surface area on the wire insulation when the wire is pulled out of the shield. The other 1/2 of the tapered head portion is a transition to the cylindrical body from the curved ellipsoidal section. In a preferred embodiment, the tool is constructed of a polycarbonate plastic with a smoothed surface on the tapered head portion to facilitate the insulated wires sliding across the surface during use.

Abstract: An apparatus for heat curing epoxy banded fiber optic connectors includes a housing containing a heater control circuit and an electronic thermometer. An L-shaped jig is attached to a surface of the housing with an interposing insulator. A heating element and temperature sensors are connect to the jig.

Abstract: A press is arranged to compress a workpiece between two turntables. One of the turntables is adapted to be rotated which, in turn, rotates the workpiece and the other turntable, a heating element is provided to seal seams on the workpiece.