Abstract: This relates to stabilized platforms for directive ship mounted antennas for satellite communication. The invention further relates to platforms comprising an antenna dish with elevation and azimuth control means, as well as counterweight means, being supported in a universal joint bearing. The main feature of the invention is that the platform includes a small mass system which is mechanically coupled to the platform in a damped manner, thereby stabilizing or damping the movements of the antenna caused by movements (roll/pitch) of the ship.

Abstract: This invention relates to a circuit for switching a voltage controlled RF oscillator between two preset variable frequencies and simultaneously imposing frequency modulation about the selected center frequency. A frequency modulation signal is fed to a stabilized amplifier chain consisting of a low level amplifier, a high level amplifier and a feedback network. A switching network allows the output of the feedback network to be changed as a function of the frequency selection input. An isolated input is provided for the injection of frequency modulation.

Abstract: This relates to an apparatus for obtaining a specific antenna current or voltage waveshape at an antenna. A reference network, which includes a low level lumped element model of the antenna and the transmitter output network, produces drive signals when impulsed. The first of these signals corresponds to a voltage having the desired antenna current waveshape. The second is a voltage having a waveshape which must be produced across the input terminals of the transmitter output network in order that the specified antenna current be produced. The third signal is a voltage which has a waveshape equivalent to the waveshape of a current which must be injected into the input terminals of the transmitter output network in order that the specified waveshape be produced. At least one of these signals is used to drive the transmitter.

Abstract: This invention relates to an apparatus for detecting the presence of a specific concentration of a conducting medium (water) in an insulating medium (oil) wherein the water/oil mixture forms an emulsion containing discrete droplets of water. A probe containing two electrodes, the first of which has a flat surface and the second of which is cone-shaped having a vertex directed at the flat surface, is immersed into the emulsion. A pulsating dc voltage is applied to the first electrode producing a static electrical charge which repels the insulating medium while having no effect on the conducting medium, causing droplets of the conducting medium to migrate towards and accumulate in the area between the electrodes. When a sufficient number of droplets have accumulated, a conductive path is formed between the electrodes causing an alarm to be generated.

Abstract: This relates to an ac circuit for actuating a monostable or bistable inductive device in response to the opening of a normally closed switch. A capacitor is provided in series with the parallel combination of an inductive switching element and a normally-closed switch. When the normally closed switch opens, there results a series circuit consisting of the inductive switching element and the capacitor which, when properly chosen, will have a capacitive reactance which substantially cancels the inductive reactance of the switching element, thereby substantially reducing the overall circuit impedance. This clearly reduces heat dissipation and insures sufficient voltage across the inductive element to cause actuation.

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: 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: 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: 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.

Abstract: This relates to a bucket-brigade delay line wherein clock frequency dependent modulation of the delayed signal is avoided by inserting at least one inverter stage into the delay line. The output of the inverter stage contains the inverted modulation signal. This signal is then added to the line thereby compensating for the unwanted modulation.

Abstract: This relates to an optically isolated switching device made by coupling the output of a light emitting diode into a thyristor. Sensitivity is determined by optical flux density rather than total flux. Improved sensitivity is obtained with a mesa construction of a diode mounted on and bonded to a thyristor at a window in its cathode via a glass preform having a high refractive index.

Abstract: A device for scanning optical images wherein light intensity of a scanned image line is converted to a pulse width modulation rather than a charge profile. A photo transistor row is connected to an inverter chain, and OR-gates have outputs which are fed to a common read line while the input signal of each OR-gate is tapped over coordinated partial rows of the photo transistor row.

Abstract: This invention relates to selenium rectifiers and a method of making them. Using techniques of electrophoretic deposition of selenium, a selenium rectifier is manufactured having a barrier layer adjacent the base electrode. This results in a cheaper rectifier with improved heat dissipation.

Abstract: This invention relates to a gated frequency difference detector for use in a frequency lock loop. The gated frequency difference detector consists of a dual output hybrid quadrature mixer, two parallel video signal processing channels, a digital phase/frequency detector, a digital scaler and a digital-to-analog converter. The difference in frequency between the RF input and the output of a local oscillator is measured. Two orthogonal frequency difference outputs are first generated, one of which either leads or lags the other depending on the sense of the difference. Signals are then bandwidth limited and amplified in two video channels and converted to logic levels. The phase and frequency are finally digitally detected and processed to generate a bipolar voltage proportional to the magnitude and sense of the frequency difference.