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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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At least 667 records · Page 37

All sources NASA NTRS DOE OSTI

NASA NTRS1969

Block coding for space communications.

Block coded telemetry systems design for phase coherent space communication employing double conversion superheterodyne phase locked receivers

Lindsey, W. C.↗

NASA NTRS1970

Radio frequency baseband recording technique

Technique uses a helical-scan video recorder with auxiliary signal-conditioning equipment to provide an inexpensive, high-capacity magnetic tape recording of a 112 channel, phase-locked, multiplexed, baseband signal.

Heckman, D. C.↗

NASA NTRS1970

Block-coded communications

Theory for block-coded telemetry systems is useful in testing performance of one- and two-way, phase-coherent telemetry systems when double-conversion, superheterodyne, phase-locked receiver, preceded by bandpass limiter is used to track carrier.

Lindsey, W. C.↗

NASA NTRS1970

Wide-range tracking oscillator generates phase and frequency coherent output

Tracking oscillator consists of modified phase-lock loop which controls voltage-controlled oscillator capable of automatic lock-on and track of periodic input waveform over frequency ratio 500-1. It is used in telemetry and communications systems where large signal fluctuations are encountered.

Howard, J. R.↗

NASA NTRS1967

Study of applications of retrodirective and self-adaptive electromagnetic wave phase controls to a Mars probe, part 2 Final report, 26 Jan. - 31 Dec. 1967

Phase-locked loop operation in multipath environment and multipath effect on detection for Mars probe

Bershad, N. J.↗

NASA NTRS1970

Optimal space communications techniques Status report, 16 Dec. 1969 - 15 Mar. 1970

All digital phase locked loop FM demodulator, and optimum adaptive delta modulator designed for improving space communication

Schilling, D. L.↗

NASA NTRS1970

Performance improvement analysis for the Apollo unified S-band system Semiannual progress report

Performance improvement analysis for Apollo unified S band system, including computerized simulation techniques and phase lock loop studies

Shelton, R. D.↗

NASA NTRS1969

Threshold extension techniques using impulse noise elimination

Threshold extension techniques using impulse noise detection and elimination implemented at phase lock loop demodulator output

Loch, F. J.↗

NASA NTRS1970

Wide-band high-resolution determination of absolute frequency

Absolute frequency wideband high resolution determination, using frequency synthesizer as phase locked loop local oscillator

Farthing, W. H.↗

NASA NTRS1970

A delta modulation threshold extension technique for frequency modulation systems

Delta modulation threshold extension technique for phase lock loop FM demodulator

Arndt, G. D.↗

NASA NTRS1970

Hybrid carrier and modulation tracking loops

Coherent receiver as hybrid carrier tracking loop consisting of standard phase locked and modified Costas loop

Lindsey, W. C.↗

NASA NTRS1971

New filter technique improves home television reception

Program studies and designs combline filters and analyzes their effectiveness in improving TV quality. Signal tracking methods are improved. Combline phase-lock loop provides significant sensitivity improvement above and below threshold.

Develet, J. A., Jr.↗

NASA NTRS1970