A low noise, high frequency oscillator (50) is disclosed which includes a JFET (100) having a tuned circuit (102) connected in a feedback arrangement with it. The JFET is operated in a self-biasing mode and includes a gate biasing circuit (104) comprised of a capacitor (114) and a resistor (116). The capacitor (114) and resistor (116) are selected such that the gate bias circuit (104) represents a low impedance path to low frequency noise components. These low frequency noise components are ther...

An incandescent projection lamp which includes a reflector located within the lamp's envelope at an established distance from a biplanar filament structure. The lamp provides bidirectional light output with the reflector having an opening therein for defining the light output in one of the directions.

A linearizing circuit is described which gives a nonlinear relation between an input and an output signal of the circuit. Such a circuit can be used to compensate for the nonlinearity in, for example, a frequency modulator. The circuit includes a nonlinear element, preferably a PIN-diode connected in a voltage divider to provide a biasing current to the element. An attenuating and an amplifying circuit are connected to the input and to the output, respectively, of the circuit. By varying the val...

A circuit for the modulation of the frequency of radiation produced by a magnetron includes a directional coupler connected to the output port of the magnetron, a circulator coupled between the output port and a load, and a phase shifter connected between the directional coupler and the circulator.

Frequency stabilization of a beam type device is disclosed that is particry well suited for avoiding cavity phase shift problems. A beam generator provides a molecular or atomic beam that is directed through a pair of spaced and separate interaction regions to a detector. The two interaction regions, such as cavities, provide independent regions into which different signals are injected with the injected signals being derived from an oscillator such as a crystal oscillator. The signal coupled to...

Described is a temperature compensation circuit comprising a transistor, a device (to which compensated voltage is to be applied) connected to the collector, and a plurality of resistors forming a voltage divider. A node separates the resistors into two branches and is connected to the base, and a temperature sensor having a negative temperature coefficient of resistance is located in one of the branches. The branches are mutually adapted so that the ratio of the resistance of the branch contain...

In a tunable UHF transistor oscillator with a frequency determining resonating LC circuit reduction of the harmonic to fundamental ratio is obtained through the use of an output circuit consisting of an output resistor connected in parallel with a resistor voltage divider a part of which is used as a damping resistor for a second controllable tuned circuit comprising an inductor with a larger inductance than that of the frequency determining circuit and the same capacitance and a non linear circ...

In an oscillator of the type producing microwaves, millimeter waves and above, apparatus and a method for increasing the size, so that one or more active devices can be coupled to the oscillator, including a first cavity operating at a higher order mode, which cavity has an output coupled thereto for removing power, and a second cavity operating at a dominant mode and coupled to the first cavity, which second cavity assures efficient and spurious-free operation of the oscillator at the desired f...

The specification describes a solid state microwave power combiner wherein a plurality of solid state power generating devices are mounted between adjacent conical support and housing structures. These structures define the microwave electrical circuits for these devices, and also as provide a waveguiding region for propagating energy from these devices to a common output line. Both the support and housing structures have their apexes integrally joined, respectively, to input and output conducto...

A sampling linearizer including a phase shifter for use in improving the accuracy of an FM generated waveform with respect to a desired frequency rate of change is disclosed. The sampling linearizer comprises an oscillator for generating a reference frequency signal; a mixer governed by the generated FM waveform signal and the reference frequency signal to generate a first signal which is sampled at predetermined sampling times; and a linearizing servo controller which is governed by the sampled...