Abstract: An RF power amplifier parallel redundant circuit employs three amplifiers. Under normal operation when all three amplifiers are functioning, the output from a comparator holds a 0.degree., 60.degree. two-bit phase shifter in the 60.degree. position. When anyone of the amplifiers or any pair of amplifiers fail, the comparator output causes the two-bit phase shifter to switch to the 0.degree. position. The system holds the power output constant at one-fourth the value of each individual amplifier for single or double failures. Only one simple switching position operation is required.

Abstract: A system to simulate motion and plasma induced variations in the attenuation of signals transmitted from reentry vehicles uses a controlled attenuator which is programmed to vary the output power of a test transmitter in a way which simulates the variation which would be observed in actual flight. The simulator can be programmed by either an analog wave shaper or a digital driver to control the attenuation characteristics of a voltage control attenuator thus producing signal variations equivalent to those induced by the plasma sheath and motion of the vehicle.

Abstract: A range resolving ground line sensor having the capability to determine range along the length of a pressure sensitive type line or cable by providing a time limited pulse of bias voltage which propagates down and back along the line and therefore provides a time history of the impedance changes as a function of distance (time) along the line.

Abstract: A high power microwave radar pulse shaping system includes a hybrid and a pair of plasma waveguide switches in combination. The two plasma waveguide switches with the hybrid between them, which, by grid pulsing of the plasma waveguide switches electronically change the RF pulsewidth and form extremely sharp leading and falling edges of the RF pulse passing therethrough.

Abstract: A high power duplexer in the millimeter region includes a beam excited plasma switch in combination with colinear waveguide transmission lines. The beam passes through four sets of slots which are positioned in the four narrow adjoining walls of the colinear waveguide transmission lines. A quasi-anode is used to aid in turn-on of the plasma switch.

Abstract: A method is provided for fabricating a gridded Schottky barrier field effect transistor and to the transistor produced thereby. The transistor is constructed by means of a single high resolution mask which does not require alignment to any reference line. Utilizing the masking properties of an oxidation layer on the sides of the etched slots, platinum is deposited only at the bottom of the groove thereby eliminating the requirement of an additional photo-masking step or the necessity of subsequent removal of platinum from other surfaces of the wafer.

Abstract: A low noise frequency source utilizes a varactor diode to form a parametric crystal oscillator which may be frequency multiplied to the desired microwave frequency, for radar applications.

Abstract: An integrated feedback active filter/integrator processes electrical signals and performs bandpass and lowpass filtering or integration and double integration. The integrating and double integrating features are obtained by setting the quality factor of the bandpass filter to one half. This provides accurate integration for all frequencies greater than about ten times the center frequency of the filter. The circuit integrates the output and returns (feeds back) this value in the negative sense to the circuit input.

Abstract: A linear filter network to provide improved distortion characteristics of a demodulated FM signal by direct synthesis of the linear amplitude transfer characteristic.

Abstract: A controllable ultrafast light shutter utilizes two sets of Pockels cell-polarizer combinations, one set is used to open the light switch, the other to close the switch allowing the selection of laser pulse duration in the picosecond region. The opening and closing of light switches thus operates as a light shutter.

Abstract: An analog-to-pulse integrating converter uses dual slope integration to achieve DC voltage to pulse rate conversion. An input signal is integrated, the integrator output is level detected and the integrator reset, at the same time there is issued an output pulse. The output pulse rate is proportional to the level of the DC input signal.

Abstract: A spectrum-shaped discriminating on/off target indicator which indicates if a signal simultaneously meets prescribed conditions on power level and spectrum shape. Signal power level and spectrum width are simultaneously measured and a DC logic output is obtained only for input signals which have a signal-to-noise ratio equal to, or higher than a preset minimum level though the signal "noise bandwidth" meets the prescribed conditions.

Abstract: A configuration of a pair of crystalline quartz wedges utilized as polarizers is combined with an electro optic switch to constitute a laser Q-switch. The two wedges are identical and are positioned on either side of the switch and oriented such that one compensates the angular deviation and dispersion of the other.

Abstract: A serrodyne generator providing a constant peak amplitude sawtooth signal wherein a voltage controlled multivibrator (VCM) determines the frequency at which a capacitor is discharged with the VCM frequency being varied by a common sweep signal. In order to maintain a constant amplitude, the current source for the capacitor is swept at the same rate as the VCM by the common sweep signal.

Abstract: A self regulating telephone apparatus wherein an individual's speech is converted to a representative electrical signal. This signal is represented by a product wave or waves of the form f(A)t x f(B)t where f(A)t represents the amplitude of the informational signal f(B)t. The signal is separated by demodulation of the cross product into its components. The relative amplitudes of the terms are changed as desired and the cross product re-established by remodulation. Since the term f(A)t represents the amplitude and its frequency range is removed from f(B)t, amplification can be provided at frequencies exhibiting low coupling between the receiver and transmitter transducer in a hand telephone set to permit increasing the signal volume output as required.

Abstract: A four-wire interface regulator for long distance trunk circuits is provided in which the interface regulator separates the components of a conventional local plant output signal to change the relative magnitude of the components to deliver any desired output with a minimum variability to drive long distance trunk circuits.

Abstract: A dynamic damping apparatus wherein the current source is critically damped during rise and fall of current but the DC flattop of the current is unaffected by the fluctuations of load voltage. Therefore the output impedance of the current source is low during rise and fall times, but high during the flattop. This increases current source regulation.