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# constant-frequency source

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• Frequency domain sensor — Frequency domain (FD) sensor is an instrument developed for measuring soil moisture content. The instrument has an oscillating circuit, the sensing part of the sensor is embedded in the soil, and the operating frequency will depend on the value… …   Wikipedia

• Frequency frogging — In telecommunication, the term frequency frogging has the following meanings: 1. The interchanging of the frequencies of carrier channels to accomplish specific purposes, such as to prevent feedback and oscillation, to reduce crosstalk, and to… …   Wikipedia

• Intermittent power source — [ Erie Shores Wind Farm monthly output over a two year period] An intermittent power source is a source of electric power generation that may be uncontrollably variable or more intermittent than conventional power sources, and therefore non… …   Wikipedia

• Open-circuit time constant method — The open circuit time constant method is an approximate analysis technique used in electronic circuit design to determine the corner frequency of complex circuits. It also is known as the zero value time constant technique. The method provides a… …   Wikipedia

• Propagation constant — The propagation constant of an electromagnetic wave is a measure of the change undergone by the amplitude of the wave as it propagates in a given direction. The quantity being measured can be the voltage or current in a circuit or a field vector… …   Wikipedia

• Planck constant — Planck s relation redirects here. For the law governing black body radiation, see Planck s law. Values of h Units 6.62606957(29)×10−34 J·s[1] 4.135 …   Wikipedia

• Variable-frequency drive — A variable frequency drive (VFD) is a system for controlling the rotational speed of an alternating current (AC) electric motor by controlling the frequency of the electrical power supplied to the motor.cite book | first=Sylvester J. |… …   Wikipedia

• Intermittent energy source — An intermittent energy source is any source of energy that is not continuously available due to some factor outside direct control. The intermittent source may be quite predictable, for example, tidal power, but cannot be dispatched to meet the… …   Wikipedia

• Superconducting Radio Frequency — (SRF) science and technology involves the application of electrical superconductors to radio frequency devices. The ultra low electrical loss of the superconductor yields RF resonators with extremely high quality factors, or Q . For example, it… …   Wikipedia

• Orthogonal frequency-division multiple access — Multiplex techniques Circuit mode (constant bandwidth) TDM · FDM · SDM Polarization multiplexing Spatial multiplexing (MIMO) …   Wikipedia

• Orthogonal frequency-division multiplexing — Passband modulation v · d · e Analog modulation AM · …   Wikipedia

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