Abstract: There is disclosed herein a redundant carrier frequency selection arrangement for an FDM communication system. The selection arrangement includes a source of n pairs of carrier frequencies, where n is an integer including one. Each carrier frequency of one pair of the n pairs of carrier frequencies are equal and the carrier frequency of each pair of the n pairs of carrier frequencies are different. n plurality of FDM communication equipment requiring a carrier are coupled to the source of n pairs of carrier frequencies and each plurality of the communication equipment of the n plurality of communication equipment responds to a different pair of the n pairs of carrier frequencies. An electronic switch is disposed in each of the n plurality of communication equipment to select either one of the carrier frequencies of an associated pair of the n pairs of carrier frequencies.

Abstract: A locking receptacle for electrical connectors includes a premold which holds the wire contacts in position and prevents insulation from overflowing into the contacts during molding. The premold is a cylindrical form of rigid high melting point thermoplastic insulating material having differently shaped passages and slots for a plurality of female contacts and connecting leads and includes an end closure member. The elements are assembled together, mounted in a mold and overmolded with a lower melting point resilient insulation covering in a simplified molding process to form an integral water-tight unit.

Abstract: A group display generator of the type wherein information appearing on the surface of a cathode ray tube is recorded on film and projected in color upon a large viewing screen. The system employs a dry type silver halide film and dry film developing process in cooperation with an image intensifier where the image appearing upon the face of the cathode ray tube is directed to the input of the image intensifier and directed from the output of the intensifier to the surface of the silver halide film in a level of surface brightness intensity equal to or greater than the illumination at the face of the cathode ray tube. The intermittent image intensifier supplies sufficient light intensification to compensate for the low image amplification inherent in the dry type silver halide film. The combination of the image intensifier and dry silver halide film allows compact and mobile group display generator application to areas heretofore inaccessible with prior art wet type film development processes and techniques.

Abstract: This microwave circuit incorporates a transistor structure that provides either a two port amplifier or an injection frequency locked oscillator. This circuit eliminates circulators employed with Gunn and Impatt diode amplifiers and injection frequency locked oscillators. The collector-base junction is reverse biased so that the collector region functions either in the Impatt mode or in the transferred electron mode. An RF input signal is applied across the forward biased emitter-base junction. With a load across the collector-base junction having a conductance equal to the absolute value of the negative conductance generated by the collector region, the circuit functions as an oscillator at a frequency which is injection locked to the frequency of the input signal. With a load of increased conductance to suppress oscillations, i.e. overload the collector region, the circuit functions as an amplifier.

Abstract: This relates to a quartz clock having a frequency divider IC with an adjustable and programmable dividing factor. The adjustable dividing factor is reached by suppression of the pulses to be divided in such a manner that the distribution of the suppressed pulses is optimized.

Abstract: A system for transmitting wideband signals, for example speech, over a narrow band is proposed. Lower frequency range signals are directly transmitted and amplitude information of partial upper frequency ranges is transmitted on pilot frequencies. At a receiver, "equivalent" signals from oscillators having frequencies approximately equal to the mid range frequencies of the partial upper frequency ranges are modulated with the amplitude information of the corresponding partial upper frequency ranges to produce "synthetic" signals. The synthetic signals are modulated with narrow band noise to crreate a more pleasing and realistic sound. Means are provided for controlling at the pick-up end the "modulation factor" of the noise modulation at the reproducing end. This is achieved by controlling the level of the third harmonic of a sync signal transmitted from the pick-up end. The level of the third harmonic may be automatically or manually adjusted to conform to the type of sound being transmitted.

Abstract: A circuit is disclosed for generating a periodic pulse train having any fixed desired duty cycle from a periodic input signal which may be either analog or digital. The input signal is fed to a transistor amplifier whose bias can be varied. The output of the transistor amplifier is coupled to an amplifying element whose possible voltage swing is limited to provide the desired pulse train. The desired pulse train from the amplifying element is coupled through a low-pass filter prior to comparison with a reference voltage in a differential amplifier. The voltage difference at the output of the differential amplifier adjusts the bias of the transistor amplifier such that the voltage of the low pass filtered desired pulse train is very close to the reference voltage.

Abstract: The amplitude of a local oscillator signal for use with a frequency mixer is maintained at a given constant level by a control signal derived from the direct current flow through the mixer diodes.

Abstract: This relates to a light emitting diode circuit wherein a coil is connected to a voltage source, the voltage of which is lower than the threshold voltage of the forward diode characteristic. The light emitting diode is connected in series via the coil to the voltage source, and a transistor operating as a switch is connected in parallel to said light emitting diode.

Abstract: Antireflection dielectric coatings on the output face of an injection laser provide a negative electric vector amplitude reflection coefficient which increases the obtainable power output. Like coatings are applied to the opposite reflective face. The output layers are preferably three quarter-wavelength coatings of titania, silica and titania. The opposite reflective layers are two quarter-wavelength coatings of titania and silica and an outer metallic layer of aluminum. Silicon monoxide can also be used in place of titania.

Abstract: An improved flash lamp attachment for self-developing collapsible cameras provides high pressure xenon flash illumination by means of removable and separate flash lamp and power-pack assemblies. The powerpack circuitry utilizes part of the voltage provided within the camera film battery pack along with voltage supplied by an auxiliary battery disposably contained within the power-pack assembly.

Abstract: An electronic feeding bridge for a telephone line uses a two-stage circuit to provide high a.c. impedance between the load and the line and between the line and the load. The first stage includes one NPN type transistor and one PNP type transistor with their bases coupled together by a capacitor. The second stage includes one PNP type transistor and one NPN type transistor with their bases coupled together by a capacitor. The emitters of the transistors of the first stage are connected to the emitters of the transistors of the second through of a pair of resistors. The collectors of the second stage are connected to the load through of a pair of diodes, and the collectors of the transistors of the first stage are connected directly to the line.

Abstract: This relates to a circuit for use in a car interlock and permits restarting of the motor for about three minutes after the unfastening of the safety belt. The circuit contains a difference amplifier, a first input switching the supply voltage of a capacitor charging circuit and a second input directly switching the charging circuit.

Abstract: A method and means for optimizing value obtainable from hog carcasses by utilizing particular hog measurements and current market values to determine cutting parameters. Ham and loin primal cuts from each carcass half are optimally produced in accordance with measurements made on the individual carcass from which the cuts are obtained.

Abstract: A method of producing an aluminum oxide and tungstate powder for insulating cathode heaters includes mixing a finely divided aluminum oxide powder with ammonium tungstate, rinsing out excess ammonium tungstate, drying the mixture and heating in a nitrogen-hydrogen atmosphere to about 700.degree.C.

Abstract: The invention provides a system for developing sync pulses when PICOR is used on sound film systems. The sprocket holes in the feed track of the film are used in conjunction with a light source and a photocell to develop sync pulses which are required to synchronize a rotating electronic switch with periodic sequential information recorded on the sound track of the film.

Abstract: The antenna reflector whose surface is to be measured is mounted on a moderately level surface. A relatively thin full diameter template is located sequentially at n different locations in the antenna reflector. Spacers are disposed between the template and the reflector surface at each of the n locations. A graduated target is mounted on the template at the certral vertical axis of the reflector. A bench scope is supported and levelled on a table disposed a convenient distance from the target and sighted at the target at each of the n locations. At each of the n locations a height reading is made and measurements of the spacing between the template and reflector surface are made at m intervals along the template. These readings and measurements are recorded in a matrix of n rows and (m + 1) columns. The change in height reading is calculated for each position of the template and used to weight the associated m spacing measurements.

Abstract: A brake shoe support for a spot-type disc brake having a caliper embracing the brake disc. The caliper supports the brake shoe remote from the brake actuation device. The brake shoe includes a projection which is disposed in a supporting bore in the caliper and is held in position by a bolt having a radial groove which is engaged by a retaining spring secured to the caliper. The brake shoe also includes a brake pad carrier plate and a brake pad with the brake pad having a first portion parallel to the brake disc and a second portion perpendicular to the brake disc extending over the edge of the brake pad carrier plate. The second portion abuts a supporting surface provided in the caliper adjacent the end of the supporting bore adjacent the brake pad carrier plate to prevent twisting of the brake shoe.

Abstract: A selected demineralized and partially delactosed whey is used as a substitute for nonfat dry milk in various food compositions. The selected whey has a predetermined ash to protein ratio of 0.01 to 0.3. Also, the selected whey can be combined with a modified starch to provide a satisfactory replacement for the nonfat dry milk constituent in baked goods.

Abstract: This invention relates to a method of selectively treating the surface of an article comprising silicon in part and either silica or silicon nitride in part wherein either the silicon or the silicon compound is etched at a greater rate or a fluoropolymer is deposited on the article by placing the article in a plasma containing fluorine, carbon and reducing species and adjusting the concentration of the reducing species to selectively etch the silicon at a greater rate, etch the silicon compound at a greater rate or deposit polymer.