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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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Variable ratio DC transformer regulator used in voltage boost configuration of power system in Radio Astronomy Explorer /RAE/ spacecraft, noting RF interference reduction
Electrocardiograph of an injured human subject is transmitted by RF and telephone links from the ambulance at the emergency scene, to the hospital emergency facilities. This system eliminates delay in the diagnosis of required therapy, thereby enhancing emergency and rescue operations.
System converts phase changes at optical frequencies to equal phase changes at RF. This system operates in conjunction with either a Michelson interferometer or conventional interferometers.
Plasma-ion source system for ground calibration of Bennett RF ion mass spectrometer
Polar cap absorption correlated with RF profiles active solar regions, and associated phenomena
Apollo single bridgewire standard initiator RF evaluation
Ion cyclotron wave generation apparatus operation in RF self sustained mode
Audio wave detection from radio stations by spacecraft-borne audio detectors in ionosphere, discussing carrier frequencies dependence on altitude and RF waves interaction with plasma
Technique using photodielectric effect of semiconductor in high-Q superconductive cavity gives initial improvement of 2-4 db in signal-to-noise enhancement of conventional RF communication systems. Wide band signal plus noise can be transmitted through a narrow-band cavity due to parametric perturbation of the cavity frequency or phase.
Integrated 60.8 GHz RF receiver and low noise IF preamplifier development
RF feedback amplifier analytical design, deriving open and closed loop feedback noise figure expressions by use of equivalent noise model
Ion cyclotron wave generation in RF self sustained mode improved by installing grid structures in plasma near magnetic mirrors
RF voltage breakdown in air for 50 ohm coaxial transmission line configuration
Laboratory and flight tests of airborne solid state UHF telemetry transmitter, discussing miniaturized coaxial hardware from RF power conservation viewpoint
Antenna pattern recording system has a discretionary signal level monitor which senses a specified minimum level occurring between sampling intervals. This enables RF power and percent coverage to be calculated more accurately.
Low-level RF amplifiers are operated at noise figures at or near the theoretical minimum, while maintaining high-gain stability. Formulas for the minimum amplifier noise figure value are derived from the analytical noise-figure expression involving the parameters of the equivalent circuit representing the actual system.
Aerial RF noise measurements in urban areas at UHF frequencies