Abstract: A dielectric waveguide ferrite resonance isolator capable of operating in e millimeter wave frequency range in a dielectric waveguide transmission line in which a thin rectangular hexagonal ferrite material is affixed to a side of the dielectric waveguide and then placed between the pole pieces of an electromagnet in order to magnitize and fully orient the ferrite material is improved by positioning a grooved block of dielectric having a low dielectric constant and high thermal conductivity against the face of the hexagonal ferrite so as to use the high thermal conductivity dielectric as a heat sink thereby extracting heat from the hexagonal ferrite.

Abstract: Method and apparatus permitting a multi-module digital system, such as a puter, having built-in test hardware associated with each module, including a plurality of signal processing units to communicate over two wire circuitry not only the existence of a failure of a particular module, but also its causality. This is accomplished by means of a four state signaling circuit interposed between each signal processing unit of a particular module and a module built-in test circuit which operates once an error output is reported by a signal processing unit to provide a further four state indication of the details of the failure.

Abstract: The aging rate of an oscillator is minimized by applying a high drive current to the resonator early in the oscillators life until the aging rate decreases to a low value and then applying a low drive current to the resonator for the rest of the oscillators life at a constant temperature.

Abstract: A transferred electron semiconductor device in the form of an oscillator, for example, is fabricated by a molecular beam epitaxy growth process wherein a plurality of semiconductor layers are sequentially grown on a planar substrate. A pair of ohmic contacts are formed on the outer surface of the substrate and the uppermost layer with the resulting structure including two distinct intermediate semiconductor regions, the first being a drift region adapted to exhibit a differential negative resistance due to the transferred electron effect, and the second being a planar doped barrier region for accelerating electrons into the upper valley and injecting them into the drift region. By the use of a planar doped barrier a more uniform electric field is obtained along with a controlled lower barrier height whereby the transfer of electrons to the upper conduction band satellite valley can be made to occur over much shorter times and distances thus extending the upper frequency range of operation.

Abstract: A millimeter wavelength bandpass filter arrangement is produced by using a first dielectric waveguide as an input for a broadband signal to a ferrite circulator. This signal is delivered to a second dielectric waveguide having a bandstop filter formed therein. The bandstop filter reflects the desired bandpass frequency(s) back to the ferrite circulator where it is delivered to a third dielectric waveguide which is the output for the bandpass frequency(s).

Abstract: A termination for a VHF inverted-V half-rhombic antenna is described, consisting of a transformer terminated into a length of high attenuation coaxial cable acting as a power dissipation line.

Abstract: A chirp transform correlator having asynchronous operation is made possible by the use of a pair of paralleled signal processing channels to which the unknown signal to be correlated is applied. The two channels include sweeping local oscillators which are interlaced in timing so that any arbitrarily timed unknown input signal will be fully transformed by one or the other of the channels.

Abstract: A tone signalling adapter for providing standard dual tone dialing capabiy to a ring-down type military field telephone set and comprising a 16 button key set mounted on a generally rectangular body secured to a saddle member which clips onto the top portion of the telephone set so that it fits beneath the cradled handset of the telephone, thus enabling the entire assembly to be carried within the confines of an existing carrying case without obstruction. The pushbutton key set, moreover, connects into the field telephone via a preexisting headset-microphone connector on the base of the telephone. The adapter also includes a releasably hinged cover on the side of the saddle member so that it may selectively face forward or backward, for inhibiting use, at certain times, of a hand-crank located on the side of the telephone set.

Abstract: A microstrip antenna is disclosed consisting of a flat metallic patch spaced from the ground plane. To increase the bandwidth of the antenna a pair of varactor diodes are provided positioned at opposite sides of the patch and connected between it and the ground plane.

Abstract: Method and apparatus for generating and utilizing a pair of expanded multiplexed noise codes from multi-bit code mate pairs having code bits of equal pulse width by first reducing the pulse width of each of the original code bits of both code mates by one half to form a pair of intermediate code mates having code bits of one half the pulse width of the original code bits. One of the intermediate codes is delayed by a time equal to at least three times the pulse width of the intermediate code bits after which it is added to the other intermediate code mate to form a first partially interleaved code mate, while a second partially interleaved code mate is generated by subtracting the delayed intermediate code mate from the other intermediate code mate and effected, for example, by forming the negative of the delayed intermediate code mate and adding it to the other intermediate code mate.

Abstract: This multi-format modulated laser may be programmed to produce a variety of utput waveforms by applying a different one of a plurality of modulating waveforms thereto. The outputs can include continuous waves, both modulated and unmodulated, Q-switched pulses, cavity dumped pulses, shaped pulses and mode locked pulses. The laser is provided with an intracavity electro-optic modulator and may comprise two coupled cavities with a gain cell in one cavity and the modulator in the other cavity.

Abstract: A digital pulse position modulation (PPM) communications system with threld extension including a radio receiver for achieving optimum coherent detection of a pulse position modulated communication signal including a coherent video detector coupled to the IF output of the radio receiver and a pulse repetition frequency loop locked to the detected video signals containing position modulation. The pulse repetition frequency loop includes a time discriminator, a filter, a voltage controlled oscillator, and a split gate generator providing a split gate no greater than the width of the applied video signal. The split gate is applied to the time discriminator resulting in the detected video signal being multiplied by itself or coherently detected. A low pass filter is connected to the output of the discriminator to provide a demodulated communications analog or quasi-analog output signal such as a voice signal, transmitted to the receiver from a digitally coded PPM communications transmitter.

Abstract: An output driver circuit for fast memories and microprocessors and the li The driver circuit is responsive to a binary input voltage and includes first and second signal control paths respectively coupled to a pair of series connected output stage transistors coupled between two high and low reference voltages and switched alternately between conducting and non-conducting states in mutual opposition to provide a binary output voltage substantially equal to either of the two reference voltages depending upon the binary state of the input voltage. Additionally included is an anticipatory circuit having means responsive to both an externally applied precharge signal and a feedback signal corresponding to the binary state of the output voltage which alternately predrive the transistors close to their respective conducting switching points for increasing the speed of transition of the transistors between conductive and non-conductive states.

Abstract: Carbon black powder is pretreated with acetone or methanol prior to cathode abrication to improve the cathode operating voltage and increase the cathode life of lithium sulfuryl chloride electrochemical cells.

Abstract: This circuit comprises a solid state crystal radiation counter having its plified output connected in parallel to a pair of pulse height discriminators with thresholds of V.sub.1 and 2V.sub.1 volts, wherein V.sub.1 is above the counter noise level. A pair of pulse counters are arranged to count the outputs of the discriminators and a processor circuit is connected to the pulse counter outputs and is arranged to calculate the quotient of the square of the output of the pulse counter connected to the discriminator with the lower threshold and the output of the other pulse counter. A display circuit is arranged to provide a reading related to the output of the processor circuit.

Abstract: A frequency multiplier for electromagnetic waves in which multiples of the input frequency propagate, while the input frequency evanesces. A rectangular waveguide or other suitable wave conveying element with a cut-off frequency above the input frequency but below the output frequency contains the multiplying structure. The input frequency is multiplied using a post located in the waveguide or other element adjacent to the source of input waves. The post may define a multiplier gap between one of its surfaces and a wall of the waveguide or other element, in which case the multiplier gap may contain a multipactor between its surfaces which generates multiples of the input frequency. The multiplier gap may alternatively contain a non-linear element responsive to a high electric field, such as a ferroelectric material, which also generates multiples of the input frequency. Alternatively, the post may be surrounded by a non-linear element of ferromagnetic material responsive to a strong magnetic field.

Abstract: Circuitry and a method for correcting errors in binary data which is stored n memory and subject to errors upon recall therefrom. The technique involves generating a redundant byte related to each original byte to be stored, storing both bytes in memory, and applying the recalled bytes to a decoder designed to correct the errors. If more than a single adjacent error per byte is expected, it is necessary to transpose the bits of the original and redundant bytes before storage so that the bits thereof alternate, and re-transpose the recalled bytes to their original sequence before application to the said decoder.

Abstract: Misfit dislocation density at an InAs-GaAs interface is reduced in both I-GaSb and In.sub.1-x Ga.sub.x As-GaSb.sub.1-y As.sub.y superlattices grown on GaAs substrates by means of a MBE (molecular beam epitaxy) growth technique consisting of a step graded sequence of composition layers between substrate and superlattice whose composition changes in discrete concentration steps from the composition of the substrate to the composition of the superlattice.

Abstract: The air gap in the joints between millimeter wavelength, dielectric waveguide circuit components is filled with a slurry made from an inorganic dielectric, such as barium titanate; and an organic binder, such as cellulose nitrate. The proportions of the dielectric and binder are taken so as to have a composite dielectric constant the same as that of the components being joined. This removes breaks or discontinuities and in turn reduces the insertion loss at the joints.

Abstract: A device in a fiber optic system for variably attenuating the signal between optical fibers consisting of two fixedly mounted optical fibers and a moveably mounted reflective surface disposed therebetween. Light emitted from the face of the first fiber strikes the reflective surface and is redirected toward the collecting face of the second fiber. That amount of redirected light which will fall incident upon the face of the second fiber, within a predetermined angle to the optical axis of the second fiber will be transmitted through the fiber and be measured by a light detector. By moving the reflective surface calibrated amounts with respect to the faces of the fixed fibers, the amount of light incident on the face of the second fiber, and thereby transmitted, can be varied, measured and controlled.