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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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Simple circuit monitors the frequency of PFM /Pulse Frequency Modulated/ telemetry signals. This discriminator can be used as a constant current integrator in such circuits as linear sweep and time delay.
Two or more series RLC circuits are used with a negative feedback amplifier to make a voltage variable oscillator. This combination results in high phase stability and optimum frequency modulation.
Earth to Moon and lunar surface-to-surface communications using lunar satellites and FM and SSB modulation techniques
Frequency modulated system to measure surface pressures on free flight models in conventional wind tunnels
Comparison of performance of pulse frequency modulation and pulse code modulation telemetry systems
Digital data processor, circuit design and fabrication, digital word readout, and interfaces for IMP D and IMP E pulse frequency modulation encoding system
Geographical distributions of geomagnetic micropulsations continuously recorded on frequency modulated magnetic tape
Deep space frequency modulation system permits transmission of data where the signal deviation is greater than 1/2 the predetection bandwidth. It provides satisfactory performance at great distances or with low signal levels.
Development of experimental linear swept frequency modulator for aircraft satellite communications
Waveform distortion in maximum likelihood Darlington detector for M-ary pulse frequency modulation signals
Dual detection system for processing AIMP satellite pulse frequency modulated telemetry data
Saturn pulse frequency modulation telemetry data processed through predictor data compressor
Statistical analysis of pulse frequency modulation systems with white noise input
Hybrid cross correlation telemetry data processing system design for decoding pulse frequency modulation
Coherent demodulation in single and double side bands with frequency modulation telemetry systems
Design criteria for pulse and frequency modulated boost regulator
Predicted and actual spacecraft radio frequency interference for pulse frequency modulation telemetry
Computer technique for predicting threshold in phased locked loops with and without frequency modulation