DataDigit system
Sounding rocket flight DataDigit system, part of pulse-position-modulation telemetry system
Fennel, J. W., Jr.↗
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Results for “PULSE MODULATION”
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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PCM encoder system Final report
Design and performance of pulse code modulated encoder system
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Predicted and actual spacecraft radio frequency interference for PFM telemetry
Predicted and actual spacecraft radio frequency interference for pulse frequency modulation telemetry
Karras, T. J.↗
Bar graph monitor
Bar graph monitor of pulse position modulation telemetry ground station equipment for sounding rockets
Harris, D. L.↗
Optimal electric-drive system for vehicles
Pulse-width-modulated controller, for vehicle electrically driven by direct current from storage battery and requiring highest possible efficiency in battery use, varies electrical power through silicon controlled rectifiers for permanent magnet dc motors. System is not restricted to dc motors.
Sahinkaya, Y. E.↗
Fidelity of the PCM telemetry data information for OGO-B-D-E-F, RAE-A, ISIS-A and OSO-D-E-F satellites
Performance accuracy of pulse code modulation telemetry data information system for scientific satellites
Karras, T. J.↗
Design and performance analysis of a medium- power dc-dc converter
Design and performance of dc-dc converter compatible with pulse width modulation inverter
Birchenough, A. G.↗
An improved telemetry system
Transmission of parity bits together with data bits by a rate one half convolutional code of 25-bit constraint length, with sequential decoding of received signal increases quantity and accuracy of data transmitted by pulse code modulated system operating at given power level.
Lumb, D. R.↗
Multifunction audio digitizer for communications systems
Digitizer accomplishes both N bit pulse code modulation /PCM/ and delta modulation, and provides modulation indicating variable signal gain and variable sidetone. Other features include - low package count, variable clock rate to optimize bandwidth, and easily expanded PCM output.
Monford, L. G., Jr.↗
PCM telemetry for earth resources aircraft. End item test report, contract item numbers 2, 3 and 7
Design and development of pulse code modulation telemetry system for earth resources survey aircraft
Starner, D. L.↗
An efficient, broad-band, switching-mode amplifier with isolated output, part 2 Annual report
Breadboard model of broadband pulse width modulated amplifier
Dunmyer, W. D.↗
Frequency shift keying apparatus Patent
Frequency shift keying apparatus for use with pulse code modulation data transmission system
Mikszan, D. P.↗
Digitally controlled frequency synthesizer Patent
Digitally controlled frequency synthesizer for pulse frequency modulation telemetry systems
Cliff, R. A.↗
Signal ratio system utilizing voltage controlled oscillators Patent
Voltage controlled oscillators and pulse amplitude modulation for signal ratio system
Broderick, R. F.↗
Transistor servo system including a unique differential amplifier circuit Patent
Electric motor control system with pulse width modulation for providing automatic null seeking servo
Currie, J. R.↗
Noninterruptable digital counting system Patent
Noninterruptable digital counter circuit design with display device for pulse frequency modulation
Winkelstein, R. A.↗
Maximum power transfer from a solar-cell array by sensing array temperature
A technique is described in which a spacecraft solar-cell array is caused to operate at or near maximum power output over a wide range of environmental conditions. The output of an array temperature sensor is used to vary the duty cycle of a pulse-width-modulated impedance regulator so that the array operates at the voltage of maximum power. A resistance-type temperature sensor was found to be applicable for most spacecraft missions. However, a solar cell used as a temperature sensor has the advantage of negligible transient errors on lightweight arrays for orbiting spacecraft.
Sussman, M.↗
Nimbus 4/IRLS Balloon Interrogation Package (BIP)
The balloon interrogation package (BIP), an integral part of the overall interrogation, recording, and location subsystems (IRLS) for the Nimbus 4 program, is described. The BIP is a self-contained, integrated transponder designed to be carried aloft by a constant altitude, superpressure balloon to an altitude of 67,000 or 78,000 feet. After launch the BIP senses high-altitude balloon overpressure and temperature, and upon receipt of an interrogated command from the IRLS aboard the Nimbus 4 satellite, the BIP enodes the data on a real-time basis into a pulse-code modulation (PCM) format and transmits this data to the satellite. A summary of the program activity to produce 30 BIP systems and to support balloon launches from Ascension Island is presented.
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