Communications elements research
Planetary entry blackout, instrumentation and data reduction for lunation experiment, spacecraft communications system, and low noise transponder preamplifier
PREAMPLIFIER↗
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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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High-sensitivity infrared receiver development Quarterly report, 1 Jul. - 30 Sep. 1966
Infrared heterodyne mixer and preamplifier development program
MIXER↗
An operational 4.2 deg K maser system.
Low noise preamplifier traveling wave maser operated in closed cycle refrigerator for receiving Mariner IV picture transmissions
REFRIGERATOR↗
Inexpensive, stable circuit measures heart rate
Inexpensive transistorized circuit provides reliable analog indications of heart rate in response to preamplified electrocardiograph signal applied to its input.
Vick, H. A.↗
Auxiliary circuit enables automatic monitoring of EKG'S
Auxiliary circuits allow direct, automatic monitoring of electrocardiograms by digital computers. One noiseless square-wave output signal for each trigger pulse from an electrocardiogram preamplifier is produced. The circuit also permits automatic processing of cardiovascular data from analog tapes.
Source record↗
Phonocardiograph system monitors heart sounds
Phonocardiograph system monitors the mechanical activity of the heart in extreme environments. It uses a piezoelectric-crystal microphone with an integral preamplifier, and a signal conditioner having special frequency characteristics. The output signals can be recorded on tape, presented aurally, or transmitted telemetrically to a remote station.
Source record↗
An ultra low-noise receiving system for deep space telemetry reception.
Ultralow-noise planetary radar receiving system with high-performance feed and maser preamplifiers, noting aperture utilization
FEED SYSTEM↗
Vibrating-piston electrostatic field sensor.
Vibrating-piston electrostatic field sensor for Gemini program, examining design improvements including unity-feedback preamplifier, noise reduction devices, etc
ELECTROSTATIC FIELD↗
Capacitance-coupled wiper increases potentiometer life
Capacitively-coupled wiper reduces the friction between the sliding contact and the potentiometer element in conventional potentiometers. A small preamplifier employed close to the wiper reduces errors caused by output cable capacitance. The device is friction free with resultant low wear and has high speed and high resolution.
Dimeff, J.↗
Low-cost, fast-response drive circuit for electromagnetic torque motors
Fast-response coil drive circuit, for electromagnetic torque motors, reduces the inductive coil time constant with a minimum of circuit sophistication. The low-cost modulator servoamplifier is used with a compatible preamplifier stage which provides the servo-loop function of summing, adjustable gain and compensation.
Zeller, J. R.↗
High resolution Ge/Li/ spectrometer reduces rate-dependent distortions at high counting rates
Modified spectrometer system with a low-noise preamplifier reduces rate-dependent distortions at high counting rates, 25,000 counts per second. Pole-zero cancellation minimizes pulse undershoots due to multiple time constants, baseline restoration improves resolution and prevents spectral shifts.
Brenner, R.↗
A new wideband traveling-wave maser system.
Wideband traveling wave maser SHF preamplifier system with high gain and low noise temperature operating in closed cycle liquid He refrigerator
Johnson, C. C.↗
Sixty-GHz integrated RF head Final report
Integrated 60.8 GHz RF receiver and low noise IF preamplifier development
Jones, W. S.↗
Biomedical sensing and display concept improves brain wave monitoring
Concept for increasing effectiveness of biomedical sensing and display promises greater monitoring capability while lessening high skill requirements in operating personnel. New concept overcomes deficiencies of current system by employing increased number of probes and microelectronic preamplifiers.
Trent, R. L.↗
RC filter with low distributed capacitance provides 60 db isolation at 500 MHz
Resistance-capacitance RC filter coupled to a high input impedance receiver preamplifier provides signal isolation from an RF transmitter. High isolation is achieved by minimizing the inductive impedance to ground and using the distributed capacitance of the filter components.
Cessna, J. R.↗
Inexpensive photon counting system with internal gate generator
Preamplifier-discriminator-gate generator in printed circuit for use with photomultipliers, noting pulse sensitivity and cost
Born, J.↗
A system for the automatic measurement and digital display of systolic and diastolic blood pressures
Basic components of system are - occluding cuff with mounted cuff microscope, cuff pump deflator, pressure transducer, preamplifier unit, electrocardiograph machine, an analog to digital convertor unit, and digital display unit. System utilizes indirect auscultatory method, based on Korotkoff sounds, for measurement.
Schulze, A. E.↗
Electronic amplifiers: A compilation
Several types of amplifiers and amplifier systems are considered. These include preamplifiers, high power amplifiers, buffer and isolation amplifiers, amplifier circuits, and general purpose amplifiers.
Source record↗