crystal wavemeter

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Essen, Louis — ▪ 1998 British physicist (b. Sept. 6, 1908, Nottingham, Nottinghamshire, Eng. d. Aug. 24, 1997, Great Bookham, Surrey, Eng.), built the cesium beam atomic clock, a device that ultimately changed the way time is measured. Atomic clocks… … Universalium
Wadley Loop — The Wadley Loop circuit was designed by Dr. Trevor Wadley in the 1940 s and was first used for a stable Wavemeter. Overview In a traditional superheterodyne radio receiver, most oscillator drift and instability occurs in the first frequency… … Wikipedia
Speed of light — The speed of light in the vacuum of free space is an important physical constant usually denoted by the letter c . [NIST and BIPM practice is to use c 0 for the speed of light in vacuum in accord with international standard ISO 31 5. See… … Wikipedia
Louis Essen — Infobox Scientist name = Louis Essen box width = image width =150px caption = Louis Essen (left center) with Udo Adelsberger (extreme left) birth date = September 6, 1908 birth place = Nottingham death date = August 24, 1997 death place = Great… … Wikipedia
Radio transmitter design — In plate modulation systems the voltage delivered to the stage is changed. As the power output available is a function of the supply voltage, the output power is modulated. This can be done using a transformer to alter the anode (plate) voltage.… … Wikipedia

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