The design of a hybrid-type S-band diode phase shifter Technical report no. 1
Ring-hybrid microwave S-band diode phase shifter which permits small phase shift increments without significant increase in loss
SEARCH · Search NASA
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.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Ring-hybrid microwave S-band diode phase shifter which permits small phase shift increments without significant increase in loss
Bandwidth constraints in earth-satellite communication systems force consideration of uncoded M-ary modulation to obtain increased data rates. M-ary phase shift keying (MPSK) at first glance seems most promising because of the high transmitter efficiency achieved through Class C operation. Multiple phase-and-amplitude modulation candidates such as quadrature amplitude shift keying (QASK) appear less promising because the transmitter must operate at lower efficiency (in linear or multimode operation). However, initial studies indicate that QASK offers significant raw dc-power savings over MPSK, despite the reduced transmitter efficiency. For example, at S-band both solid-state and traveling wave tube (TWT) QASK transmitters can provide a 3-dB average dc-power savings over comparable 16-ary phase shift keying (PSK) for the same bit rate and error probability. The reason for this savings is that QASK requires much less average signal-to-noise ratio than 16-ary PSK for the same error rate.
Timing errors effect on detector output statistics of phase shift keyed /PSK/ communication systems
Deep space communication system using sequential decoding, binary phase-shift keying and 8-level quantized decisions
Second quantum corrections to phase shift in collision between particles with spherically symmetric potentials
Tabulated data provides phase shifting of sequences information for facilitating design of synchronous digital machines
Evaluation and comparison of various phase shift analyses of proton-alpha elastic scattering
Optimum design of binary phase shift keyed communication links with noisy phase reference
A gyrator circuit is described which is of the conventional configuration of two amplifiers in a circular loop, one producing zero phase shift and the other producing 180 phase reversal, in a circuit having medium Q composed of all field effect transistors of the same conductivity type. The current source to each gyrator amplifier comprises an amplifier which responds to changes in current, with the amplified signals feed back so as to limit current. The feedback amplifier has a large capacitor connected to bypass high frequency components, thereby stabilizing the output. The design makes possible fabrication of circuits with transistors of only one conductivity type, providing economies in manufacture and use.
Antenna pointing faster than mechanical scanning. Three antenna phased array connected to receiving signal-processing system through two phase-shifting networks. Two networks simultaneously steer phased array in two slightly-different beam directions; one for scanning, one for tracking. Technique has many uses in military and civilian radar, principally in tracking aircraft, balloonborne weather instruments, and other moving signal sources or reflectors.
Backscattering cross section measurements of slowly moving target, using phase shift
Radiative lifetimes of strongest vacuum UV MULTIPLETS of B I, B II, C I, C II, N I and N II measured by phase shift method
Phase shift as quantitative measure of relationship between surface convection and charge relaxation
Phase shift analysis of nucleon-pion coupling, noting discrepancy between empirical and theoretical results
Detector circuit accurately separates and counts phase-shift pulses over wide range of basic pulse-rate frequency, and also provides reasonable representation of full repetitive EKG waveform. Single telemeter implanted in small animal monitors not only body temperature but also animal movement and heart rate.
Spherically symmetrical classical scattering theory shows dependence on phase shift through appearance in quantal formulas for scattering amplitude and total cross section
Conference on proton, pion, and muon interactions - phase shift analyses of pion-nucleon and nucleon-nucleon scattering, charge distributions and pion decay into gamma rays
Radiative lifetimes of UV multiplets in Si, P, S, O, Ne 2 and Ar 2 measured via phase shift method, correcting for transition cascading