low-frequency mode

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• Very low frequency — or VLF refers to radio frequencies (RF) in the range of 3 kHz to 30 kHz. Since there is not much bandwidth in this band of the radio spectrum, only the very simplest signals are used, such as for radio navigation. Also known as the myriameter… …   Wikipedia

• Ultra low frequency — The Ultra Low Frequency (ULF) is the frequency range between 300 hertz and 3 kilohertz. Many types of waves in the ULF frequency band can be observed in the magnetosphere and on the ground. These waves represent important physical processes in… …   Wikipedia

• Extremely low frequency — (ELF) is the band of radio frequencies from 3 to 30 Hz. ELF was used by the US Navy and Soviet/Russian Navy to communicate with submerged submarines.ExplanationBecause of the electrical conductivity of salt water, submarines are shielded from… …   Wikipedia

• Very-Low-Frequency-Verfahren — Das Very Low Frequency Verfahren (VLF Verfahren) ist ein passives elektromagnetisches Verfahren in der Geophysik. Unter Ausnutzung der elektromagnetischen Induktion lassen sich Rückschlüsse auf die Leitfähigkeit des Untergrundes ziehen.… …   Deutsch Wikipedia

• Very Low Frequency (Geophysik) — Das Very Low Frequency Verfahren (VLF Verfahren) ist ein passives elektromagnetisches Verfahren in der Geophysik. Unter Ausnutzung der elektromagnetischen Induktion lassen sich Rückschlüsse auf die Leitfähigkeit des Untergrundes ziehen.… …   Deutsch Wikipedia

• Frequency comb — A frequency comb is the graphic representation of the spectrum of a mode locked laser. An octave spanning comb can be used for mapping radio frequencies into the optical frequency range or it can be used to steer a piezoelectric mirror within a… …   Wikipedia

• Mode Sifflement — Le mode sifflement est un mode de propagation dispersif dans les plasmas magnétisés. Excité par la foudre, des perturbations, se propagent dans la magnétosphère d un hémisphère à l autre de la Terre. Son caractère dispersif provoque un étalement… …   Wikipédia en Français

• Mode-locking — is a technique in optics by which a laser can be made to produce pulses of light of extremely short duration, on the order of picoseconds (10−12 s) or femtoseconds (10−15 s). The basis of the technique is to induce a fixed phase… …   Wikipedia

• Low-cost solar cell — The low cost solar cell is an effort to make solar power price competive with traditional (fossil fuels and nuclear power) energy sources.The polysilicon shortage [http://www.greentechmedia.com/articles/charting a path to low cost solar 1128.html …   Wikipedia

• Frequency mixer — This article is about non linear mixing operating in the frequency domain. For other types of mixers, see electronic mixer. Frequency Mixer Symbol. In electronics a mixer or frequency mixer is a nonlinear electrical circuit that creates new… …   Wikipedia

• mode — mode1 /mohd/, n. 1. a manner of acting or doing; method; way: modern modes of transportation. 2. a particular type or form of something: Heat is a mode of motion. 3. a designated condition or status, as for performing a task or responding to a… …   Universalium