Abstract: A CLIMAX-network-compatible receiver with squelch capability comprises a demodulator for processing RF and IF, a squelch gate in the intelligence processing channel, and squelch gate control circuitry connected between the demodulator IF (or demodulator RF) and the squelch gate. In the control circuitry, a swept band (i.e., swept frequency) type of spectrum analyzer receives the demodulator IF and outputs a waveform whose envelope represents all the frequency components in the tested IF band. The detected envelope of the analyzer output is next treated by a compression-effecting log amplifier whose output is then tested by two different detectors for carrier attributable content and noise attributable content. The outputs of the two detectors are differenced and such difference is used to control the gate. The log amp ensures that the gate is controlled in accordance with the ratio of IF carrier to IF noise, regardless of whether IF gain variations change the difference between IF carrier and IF noise levels.

Abstract: A digital sampling phase detector is provided for NRZ data phase detection and is particularly suited for applications with long sequences of no data activity. In a phase locked loop application, phase error circuitry detects the phase difference between data transitions and clock transitions of the recovered clock, and outputs phase error signals corresponding to various durations between designated transitions. Sampling switching circuitry responds to a data transition to initiate a measuring interval by forcing the output of the phase error circuitry to a low impedance follower mode to permit sampling, and responds to a designated clock transition to terminate the measuring interval by forcing the output to a high impedance state. The sampling switching circuitry prevents the sampled signal level from drifting during a non-measuring interval, and the reduction of drift significantly reduces jitter in the recovered clock. The sampling function is provided in combination in a high speed ECL phase detector.

Abstract: An absolute-incremental hybrid shaft position encoder providing compacted high resolution. In the preferred embodiment an encoder track is superimposed by a shutter so as to make multiple track revolutions appear electrically as a single revolution.

Abstract: A digital phaselock demodulator suitable for demodulating a variety of phase or frequency modulated signals including an FM'd VOR signal component. A digital phase detector receives the modulated input signal and a feedback signal, and outputs demodulated signal. Two sets of digital words of different word rates are provided wherein one set is reversible in order as a function of phase between input and feedback signals. Digital word comparison occasions the feedback signal.

Abstract: A measuring system includes a plurality of resistors and circuitry connected thereto which generates first and second signals each containing different information about one or more of the resistors. Each information is possibly contaminated by error but only by substantially the same error contaminating the other information. Subtraction of two such informations thus gives error-free information because the like errors cancel.

Abstract: An antenna and preamplifier system suitable for use with airborne ADF equipment. Each of two orthogonally oriented loop antennas feed a different one of two preamplifiers. Each preamplifier includes an impedance establishing network and a pair of negative feedback amplifiers operating in push-pull.

Abstract: A compressor comprises a variable gain path and a feedback path. The variable gain path includes a modulator which, in response to an input signal and a feedback signal, outputs a train of pulses whose widths and heights are modulated. Also in the variable gain path, a demodulator converts the pulse train into a compressor output. Feedback is derived from the variable gain path.

Abstract: A rotary positioning system includes a prime movement device having a plurality of windings spatially distributed to cause a rotor to assume, upon commanded energization of the windings, different ones of discrete angular positions. The system also includes a temperature variable power supply which compensates for the rotor's temperature-dependent variation in damping.

Abstract: A contrast enhanced color display apparatus, capable of providing a wide variety of colors, comprises a display means for emitting at least three colors and a color filter means disposed between the display means and a viewer. The color filter means has a frequency selectivity characteristic which produces more attenuation at some non-emitted color frequencies than at other emitted color frequencies.

Abstract: An artificial fishing lure attachable to a line for bass fishing and the like having a curved barbed hook on one end for insertion in an elongated plastic worm, with the opposite end of the hook shank being coiled for sleevably receiving and retaining a reversely mounted hula skirt thereon. A flexible coiled spring is swivelly connected to the lure shank adjacent the hula skirt and is threadedly embedded in an end of and securely retains the worm on the lure when struck by a bass.

Abstract: In a duty cycle modulated power regulating apparatus, loss of regulation is anticipated by monitoring the duty cycle of the regulating means.

Abstract: Strain gauge apparatus comprises two strain sensitive piezoresistors R.sub.r1 and R.sub.t1, two op-amps, three predetermined value resistances, R.sub.a, R.sub.b, and R.sub.c, and voltage source supplying V.sub.dc. Said elements are connected to produce an output signal of the form V.sub.dc (R.sub.c /R.sub.a l ) (R.sub.r1 / R.sub.t1 -R.sub.a /R.sub.b).

Abstract: A receiver includes demodulator, squelch gating and squelch circuit for controlling the gating. A blanking circuit, responsive to impulse type noise, prevents impulse noise energy from contributing to the control of the gating.

Abstract: Strain gauge characteristic stabilization apparatus comprises a parallel connected combination of strain sensitive resistance (i.e., R.sub.eq), temperature conditioning means proximate R.sub.eq, and circuit means between R.sub.eq and the temperature conditioning means. The circuit means senses deviations in R.sub.eq from a predetermined value and causes the temperature conditioning means to control the temperature of R.sub.eq so as to reduce the deviations substantially to zero.

Abstract: Phaselock or frequencylock systems employ sampling means and memory means to effect control. Adjustments in phase or frequency are made according to stored signals and the stored signals are updated in accordance with samples of an error indicative signal.

Abstract: A free-running inverter preventing excessive current spikes comprises a transformer and a switch means for alternately connecting, and then disconnecting, a DC voltage to a transformer primary winding which encloses a parallel combination of a saturating magnetic core and a non-saturating magnetic core. A transformer feedback winding enclosing only the saturating core drives the switch means during and between switch states. Switching between states is accomplished prior to saturation of the composite core.

Abstract: A printed circuit board, preferably, including a feed-through capacitor having outer and inner conductors separated by a dielectric through which the outer and inner conductors capacitively couple. An electrical energy carrying printed circuit line which is to be filtered is connected to the capacitor outer conductor. The inner conductor is connected to a local ground potential.

Abstract: A gyro system employing the pickoff synchros as erection sensors and as torquers to erect the gyro.

Abstract: A digital radar including (i) a digital memory whose stored array of digital words represents radar searched space and (ii) display smoothing apparatus receiving the memory data and quadrupling the number of digital words available for display. Typical of the preferred embodiment, a four digital word group comprising W.sub.a, W.sub.b, W.sub.c, and W.sub.d, and representing four mutually contiguous searched space segments is used to produce the average of W.sub.a and W.sub.b, the average of W.sub.a and W.sub.c, and the average of all four in the group. The averages and the memory words are painted on a display in their appropriate locations.

Abstract: A digital weather radar system having a mode that clears the display of all clutter and lighter precipitation to reveal or positively present only the contoured areas, i.e., the severe "cores" or "hard spots." Data representative of the searched space is stored at least temporarily in a digital memory. In the preferred embodiment, a controllable decoder operates on this data according to the particular decoder state selected, the decoder output is D/A converted, and the resultant analog signal is used to intensity modulate a cathode ray tube (CRT).