Abstract: Means for achieving square wave charging of pulse forming networks in line ype pulsers which include parallel pulse forming networks with charging inductors connected between the PFNs. The cumulative value of the distributed inductance of the charging inductors is chosen so that when combined with the total capacitance of the PFNs, the charging network pulsewidth equals the interpulse period.

Abstract: A system for increasing the relative sensitivity of a photographic system ing dry silver emulsion film. Two concepts are combined to obtain the required sensitivity for dry film material. First an image intensifier tube is used to collect and amplify the light from the target to be photographed with the phosphor anode of the tube being coupled to the dry silver film by means of a fiber optics face plate. Secondly, photon amplification is additionally used to enhance the sensitivity of the dry silver emulsion, by illuminating the photo-cathode or the film itself at the time of exposure with a uniform low intensity non-imaging light.

Abstract: This receiver includes in its IF channel a summing network by means of wh the output of a calibrated reference oscillator may be added to the received signals. The frequency and amplitude of the reference oscillator are adjusted to match those of a desired one of several co-channel signals which may be simultaneously present in the IF channel. The combined signals are amplitude limited and applied to a frequency deviation detector in which the wide frequency deviations caused by the interaction of the reference and desired signal are detected. The technique can be used to demodulate angle or amplitude modulated signals obscured by jamming signals and to measure the frequency and amplitude of signals which are similarly obscured.

Abstract: A catalyst system for the elimination of hydrogen gas which comprises a ptetrafluoroethylene-bonded catalyst layer of carbon mixed with platinum black, a porous polytetrafluoroethylene film on the side thereof which faces the gas flow, and a metal backplate, all integrally bonded together. The assembly is particularly useful for the elimination of hydrogen gas in sealed equipment housings, for example, those containing batteries. A similar system may also be used as a detector of hydrogen by utilizing a detector paper therewith which indicates the presence of water.

Abstract: A CW radar transmitter is simultaneously frequency modulated with a sinusal wave and phase-modulated with a pseudorandom binary code. Both the frequency of the FM signal and the bits and bit duration in the binary code can be varied to change the resolution and range of the system.

Abstract: The circuit includes means for regenerating and removing noise from a reced pseudo-random IFF interrogation signal modulated onto a radar signal. The regenerated code is decoded by correlating it with a locally generated replica thereof which is run at a different bit rate, thus achieving asynchronous correlation.

Abstract: A ladder shaped dielectric substrate for a meander line slow-wave structure ocated between a serpentine metallic meander line conductor and a metallic ground plane. A pair of RF connectors having respective inner conductors connected to the ends of the meander line conductor are mounted on the ground plane.

Abstract: A VHF/UHF communications blade type antenna additionally having microwave nding system (MLS) antenna elements mounted thereon and having the microwave feed components integral therewith to provide a composite structure adapted to function both as a communications and as a navigation antenna. The antenna is particularly adapted for use with aircraft which is to be retrofitted to include MLS capability.

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Abstract: An X-ray diffraction system for crystal analysis employing laser alignment o reduce errors inherent in the mechanical operation of the goniometer apparatus.

Abstract: The information legibility of multi-color graphic material is enhanced by a method illustrated as follows: Frames of panchromatic silver-halide black and white negative film are separately exposed through red, green, and blue transmitting filters respectively to an image of the original multicolor material. The negative images on the frames of film are developed and fixed, and then printed on respective red, green, and blue-dye developing positive transparency materials. The red-dye, green-dye and blue-dye positive transparencies are then superimposed and retained in register.

Abstract: A method of insuring efficient triggering of a laser flashlamp by ion plag to the outer surface of the quartz envelope of the flashlamp and an elongated thin electrically conductive strip which consists of an underlying thin layer of silver coated with a thin layer of nickel.

Abstract: A sandwich type computer keyboard with keys characterized by a tactility to provide a positive degree of tactile feedback to an operator and having an electroluminescent panel for illuminating the keyboard panel.

Abstract: An adaptive coder and decoder for reducing the bit rate required to trans digitally encoded speech signals. The invention relies on the fact that the speech pattern of the average talker contains significant numbers of inter-syllable and inter-word pauses. The coder includes circuitry that monitors the idle pattern code generated by the coder's analog-to-digital converter and a code word generator that generates one or more special code words that are substituted for idle pattern code sequences of predetermined length. The speech signal and special code words are then fed into an elastic buffer and transmitted to the distant receiver at a lower bit rate than was employed for the encoding process.

Abstract: An air traffic control system wherein a ground based interrogator/receiver nterrogates an aircraft transponder which, in addition to responding to the interrogation, also transmits automatic encoded altitude information. The interrogator/receiver unit processes the received signal to derive relative azimuth and range information of the interrogated aircraft and to decode the altitude information to provide the aircraft reported altitude signal. The aircraft reported altitude signal is compared to the selected glide path height which is a function of the range that the approaching aircraft is from the runway touchdown point. The difference is noted on a glide scope meter. By observing the azimuth and range readings, and also the deflection from zero on the glide scope meter, the controller will be able to inform the aircraft pilot of the approaching aircraft position relative to runway center line, glide path and distance from touchdown.

Abstract: A range switching circuit for a solid state electrometer, e.g., for use in radiacmeter, includes a substantially symmetrical circuit having an n-channel MOSFET and an NPN transistor in one branch and a p-channel MOSFET and a PNP transistor in the other branch. The electrometer includes an operational amplifier with two high value resistors in the feedback path. A latching reed relay selectively shorts out one of the feedback resistors when one of the transistors is gated on by the corresponding MOSFET.

Abstract: An improved circuit utilized in an RF tuner or receiver for selecting and nverting an RF signal to an intermediate frequency with reduced injection power requirements.The circuit is utilized in the "front end" of a radio frequency receiver or tuning section, the purpose being to convert the received RF signal to an intermediate frequency. The improved circuit comprises and includes a diode sampling bridge coupled to an RF signal receiving source, such as an antenna, a local oscillator coupled across the bridge providing pulses for actuating and turning on particular diodes of the bridge for a relatively short length of time. The bridge output is coupled to a selecting transistor, which may include a crystal filter coupled to the emitter of the transistor. The pulsing signal across the diode bridge is relatively short in comparison with the received RF signal. When the diode sampling bridge is conducting, the RF signal is mixed and passed to the selecting transistor base.

Abstract: An adaptive trunk data transmission system in which data bits to be communicated are not transmitted during certain fade durations of a multi-channel propagation characteristic, but are delayed instead, until the fade interval is over, when they are then transmitted.

Abstract: Contaminants are rapidly removed from surfaces by precleaning the surfaces in air, and then irradiating the surfaces with shortwave ultraviolet light in the presence of oxygen.

Abstract: An impedance matching device is disclosed which automatically maintains h isolation between two opposite ports of a four port hybrid while the impedance of one of the other ports varies randomly. The device operates by sampling the signal at the output of the port it is desired to isolate and adjusting the impedance of the port opposite the port of randomly varying impedance in such a way as to minimize the sampled signal and thereby maintain isolation.