Abstract: A feedback voltage regulator for a television deflection apparatus having a deflection switching arrangement driving a deflection winding and supplied with power from a source of potential through a first inductor includes a second inductor coupled in series with the first. The second inductor conducts a substantially direct current towards the source of potential. An SCR is coupled in parallel with the second inductor and its conduction is duration modulated in response to the regulated voltage. The duration modulation controls the time during which the direct current is withdrawn from the deflection switching arrangement and first inductor and thereby maintains the regulated voltage substantially constant.

Abstract: A shutdown circuit both electrically and magnetically isolated from the horizontal deflection circuit and the flyback transformer. The voltage across a winding magnetically coupled to an inductive element carrying the current required by the deflection circuit and the flyback transformer is detected. The horizontal deflection circuit is disabled in response to voltages above a predetermined value. In an Iso-Hot type receiver having an oscillator coupled to the deflection circuit by an optically operating drive circuit, the drive circuit is rendered optically non-transmitting.

Abstract: A high range resolution FM-CW radar system, having a range resolution cell on the order of the minimum distance between two highly reflective points of a target. Circuits are included for evaluating the difference between the echo intensity received from a resolution cell containing a highly reflective point of a target and that received from a resolution cell located at the same distance but containing only clutter.

Abstract: A television vertical deflection circuit is disclosed. A sawtooth generator is connected to a driver circuit and this circuit is in turn connected through a capacitor to an output amplifier, which powers vertical deflection coils of a television receiver. A first voltage source is connected through a forward diode to the output amplifier. A second voltage source is connected through switching means to the output amplifier. A signal from the driver circuit to the base of a transistor of switching means shuts the first voltage source off and turns the second voltage source on.

Abstract: A television kinescope deflection circuit having improved linearity includes a deflection winding coupled in series with a first capacitor. A deflection switch and retrace capacitor are coupled across the serial combination of the deflection winding and first capacitor. The first capacitor responds to the deflection current to form a linearizing signal which modifies the flow of deflection current to provide S-correction. The linearity correction is improved by a series-resonant circuit coupled in parallel with the first capacitor and tuned to the second harmonic of the deflection frequency.

Abstract: In a circuit for producing pseudo-random sequences of digits, using at least one switch to the inputs of which sequences of digits are applied, the control signals determining the connections established by the switch between its inputs and its outputs, are made a function of signals previously supplied by at least one of the outputs of the switch.

Abstract: A hand-carried and self-contained receiver and indicator for producing a signal when the presence of pulsed (or pulsed doppler) radar operation is detected, either in a broad band containing all the common radar pulse frequencies, or in a limited band whereby those outside the band are rejected. A simple biconical horn antenna is provided at one end of a very short coaxial line leading to a broadband detector. From the detector, a flexible transmission line connects to the remaining receiver circuitry containing, in one mode of operation, an amplifier, a limiter, a retriggerable multivibrator and an audible beep type of tone generator driving an earphone. In another mode of operation, the retriggerable multivibrator is replaced by a dual tuned circuit having a substantially restricted bandwidth for passing only a desired pulse frequency signal.

Abstract: An array (aperture) signal processor using surface acoustic wave delay lines for reordering of the received signals according to the prime number transform algorithm. The output of the processor is a radar response equivalent to forming a multiplicity of narrow beams essentially simultaneously. Reordering of the received signals is simply a matter of rearranging the hardwired connections to a first SAW delay line, and convolution of the reordered signals is achieved by phase weighting the taps in a second SAW delay line which forms part of a transversal filter.

Abstract: 1.

Abstract: For aircraft equipped with ATCRBS, an interrogation system including an interrogator and an auxiliary transponder located adjacent the runway and on opposite sides thereof, respectively. The interrogator is enabled through a signal cable from a remote location, such as a control tower, to produce the first of the discretely spaced pulse pair required to interrogate the ATCRBS equipment. The second interrogation pulse of the pair is generated by the transponder, which is activated by the radiated first pulse from the interrogator and includes an internal delay, such that this delay plus the transit time from the transponder serves to generate the second pulse of the pair if the aircraft to be interrogated is in the vicinity and on the pathway centerline or within a specified lateral tolerance therefrom. The ATCRBS reply may be received directly at the control tower or may be transmitted by cable from receiving equipment within the interrogator.

Abstract: A kinescope deflection arrangement includes a deflection winding driven by a deflection generator. A pincushion correction circuit includes a switchable impedance coupled in series with the deflection winding. A portion of the retrace voltage pulse appears across the switchable impedance. A transformer has a primary winding coupled to the output of the deflection generator, and a secondary winding on which a sample of the retrace pulse appears. A pincushion correction circuit damping resistor is coupled between the transformer secondary winding and the impedance.

Abstract: An active radar augmentation system in a drone target aircraft, for the purpose of decreasing damage to the target. The system includes a receiving antenna in the nose, an amplifier, and a rear mounted transmitting antenna, connected by suitable cables.

Abstract: A radar altimeter having a tracking circuit which includes a controllable reference signal generator which is adapted to selectively control the tracking circuit so that there will be no indication of an altitude change in the event of a momentary loss of a received video signal due to the fading of the video signal or other condition requiring the locking of the tracking circuit because of a lack of reliability of the received video signal.

Abstract: A pair of output transistors forming a single-ended push-pull circuit are alternately turned on and off at a vertical cycle to supply a vertical deflection current to a vertical deflection yoke. A low voltage winding is wound on a horizontal flyback transformer connected to a horizontal output transistor. First and second rectifying circuits are provided for rectifying and filtering a horizontal scan period portion and a horizontal flyback portion, respectively, of the voltage developed across the winding, and d.c. outputs of the rectifying circuits are fed to the push-pull circuit as operating power therefor. The first rectifying circuit includes a capacitor-input filter circuit while the second rectifying circuit includes a choke-input filter circuit, a critical current of which choke-input filter is established between a maximum current and a minimum current required for the push-pull circuit.

Abstract: A deflection waveform generator uses a low voltage accurate capacitor to integrate the yoke deflection current and derive a parabolic waveform for "S" correcting the basic sawtooth deflection waveform. This parabolic waveform is fed back to the inverting input of a balanced operational integrating amplifier, the inverting input also having the integrating network coupled thereto. The polarities of the signal waveforms at the inverting input are such that the combined signal fed through the integrating network creates a "S" corrected sawtooth yoke deflection current which drives the electron beam in a manner which compensates geometric distortion inherent in the CRT.

Abstract: A source of unregulated direct voltage is commutated at the horizontal rate by a two-transistor switching regulator and applied across a transformer primary winding. The duty cycle of the alternations is controlled to maintain the peak-to-average value of a first portion of the alternations at a constant value. A rectifier serially coupled with a capacitor is coupled across the secondary winding of the transformer and produces a direct voltage across the capacitor from the first portion of the alternations. The junction of the rectifier and secondary winding is grounded. A television horizontal output transistor has its emitter grounded and its collector coupled through an inductance to the other end of the rectifier. A constant energy is stored in the inductance during each deflection cycle for application to the horizontal output stage. The horizontal output transistor is one of the two regulator transistors.

Abstract: A radar altimeter system for measuring, from an aircraft flying above tropical forest areas, the height of the ground and the height of the forest canopy above the ground comprising a transmitter, a receiver for detecting return pulses from the ground and forest canopy, timing means for measuring the time of arrival at the beginning and end of each received pulse and averaging the said times, means for examining the received pulse duration and preventing pulses with a shorter time duration than a predetermined time from passing further in the system, and means for examining a selected number of pulses and coupling the voltage derived from the received pulse having the longest time of arrival to an output to give an indication of the ground level and the voltage derived from the received pulse having the shortest time of arrival to an output to give an indication of the forest canopy level.

Abstract: A programmable signal processor is disclosed for use with an array radar. e programmable signal processor has quadrature channel, moving target indicators followed by post detection integration. The moving target indicators can be programmed to have any desired frequency response and can be adapted as a function of antenna beam position, range bin sector, or time. The processor also contains a high speed buffer which provides the capability to record, in real time, unprocessed raw video as well as corresponding processed moving target indicators and integrator outputs. The signal processor simultaneously processes the in-phase and quadrature components of the input signal. The output processed video signal is a digital representation of the input signal with fixed or slow moving clutter reduced and the signal-to-noise ratio improved by the response of the moving target indicator filter and the integrator respectively.

Abstract: A privacy communication system is herein disclosed comprising apparatus for digitizing information to be transmitted, apparatus for logically adding a selected pseudo-random digital code to the digitized information, apparatus for removing the pseudo-random code upon reception and apparatus for synchronizing the transmitted and received pseudo-random codes.

Abstract: A phase interferometer elevation angle measurement radar has its antennas tilted slightly relative to each other so as to detect differences in amplitude from ground return signals; the phase difference in signals (normally utilized as an indication of depression angle below boresight in an interferometer radar) is checked for a positive rate of change; it is then compared against amplitude differences and is accepted as valid for use in generating an elevation angle only if within prescribed limits thereof. This resolves ambiguity in phase which results from a wide spread of antennas with respect to the wavelength of the radar.