THE DIVERSITY-LOCKED LOOP - A COHERENT COMBINER
Multiple-input servosystem in which a primary phase-locked loop is controlled by combined signals of fm and pm communication system
COMMUNICATION SYSTEM↗
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Results for “Locking”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Instrument adjustment knob locks to prevent accidental maladjustment
A device, incorporating a collar with a hexagonal opening which fits snugly over a hexagonal nut used to engage instrument panel components, keeps the adjustment knob locked. A quick release mechanism frees the knob for rotational adjustment.
Source record↗
Bandwidth switching is transient-free, avoids loss of loop lock
A circuit, in a wide bandwidth mode, overcomes transient-producing capacitance switching by maintaining an equivalent voltage at all times. Bandwidth switching may be done at any time, and integrity of the loop lock is maintained.
Source record↗
Screw locking cups quickly and neatly crimped
A tool consisting of a positioning pin which is engaged in the screw and depressed until the tool body contacts the locking cup permits quick and neat crimping.
Source record↗
Coiled spring makes self-locking device for threaded fasteners
Coiled spring device provides both easy self-locking and disassembly for screw-threaded fasteners. When the fastener turns in one direction the spring grips one of the fastener threads and releases when the fastener turns in the opposite direction.
Source record↗
Locked oscillator phase modulator, appendix d final report
Design parameters for linear phase modulation of locked oscillator
OSCILLATOR↗
A phase locked dual channel spacecraft receiver for phase and group path measurements
Phase locked dual channel spacecraft receiver for phase and group path measurements
SPACECRAFT↗
A Threshold Theory for Phase-Locked Loops
A model of a phase-locked loop has been developed which is valid for all signal-to-noise ratios. The model is in the form of a nonlinear feedback system with randomly time-varying parameters. The analysis considers two operating regions. In low signal-to-noise ratio regions, the important consideration is stability. We want to study the asymptotic stability in the mean of a nonlinear system. It follows directly that a necessary condition for asymptotic stability of any nonlinear system is that a linearized model about some equilibrium point be asymptotically stable. By considering all possible equilibrium points, we can find an upper bound on the value of noise density which makes the system unstable. This upper bound represents a threshold value for system operation. In high signal-to-noise ratio regions, our results provide an exact statistical. description of system behavior. Therefore, knowledge of the spectrum of the signal and noise may be used to optimize the system configuration.
Van Trees, H. L.↗
Electronic phase-locked-loop speed control system is stable
Phase locked-loop circuit is used for playback motors in digital tape recorders where the reproducer output remains in exact synchronism with an external reference clock over extended periods. It removes the motor dynamics from the control loop so that the loop is stable without damping.
Stone, F. A.↗
An investigation of phase-lock loop swept- frequency synchronization
Rapid synchronization of phase-locked oscillators is best achieved by the swept-frequency acquisition technique, wherein the voltage-controlled oscillator /VCO/ is linearly swept through the uncertainty band. The theoretically predicted sweep rates of this technique and the observed experimental results differ by less than seven percent.
Dye, R. A.↗
Shot-effect influence on the frequency of an oscillator locked to an atomic beam resonator
Shot-effect influence on frequency of oscillator locked to atomic beam resonator
RESONATOR↗
Diversity-lock phase demodulator
Synchronous diversity-lock phase demodulator for tracking and demodulating orthogonally polarized signals transmitted from satellites
SIGNAL TRANSMISSION↗
Adjustable, self-locking ladder includes optional work platform
Height-adjustable ladder with a self-locking platform at its top makes elevated locations more accessible, increases the quantity and size of tools handled there, and decreases the risk of disturbance or damage to components. The retractable platform adapts the ladder to normal use.
Webster, R. E.↗
Lock-disconnect mechanism gives positive release to joined bodies
Umbilical system mechanism locks and unlocks through an internal collet device that is controlled by a single reciprocating shaft. The reduction in the number of operational parts results in higher reliability.
Beaver, C. E.↗
Finite expansion of a spherical cavity in a locking medium
Finite expansion of spherical cavity in locking medium using finite strain theory
EQUILIBRIUM↗
A note on phase-locked loops in space communications
Phase locked loops in space communications
DATA REDUCTION↗
Frequency locked loop FM demodulator.
Frequency locked loop FM demodulator with high noise threshold
NOISE THRESHOLD↗
Improved phase locked loop receiver
Improved phase locked loop receiver tracks and demodulates a signal whose signal-to-noise ratio may be low and whose information sidebands are close in frequency. This receiver recovers the carrier from input signals and applies it to a demodulator which recovers the sidebands.
Daley, T. J.↗