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'''Test and tagging''' is a generic name given to the process of visually inspecting and electrically testing in-service electrical equipmen ...l inspection for defects such as damage or missing components and a number of electrical tests to measure [[Ground (electricity)|earth continuity]], [[El

...ated]] information. The IF signal frequency is chosen to be either the sum of the two frequencies at the mixer inputs ([[Heterodyne#Up and down converter ...the mixer outputs are greatly attenuated, reducing the required complexity of the IF filter.

| location = [[Image:Flag of the United States.svg|20px]] [[Cedar Rapids, Iowa]], [[United States|USA]] ...ment to establish a communications link with the [[South Pole]] expedition of [[Rear admiral|Rear Admiral]] [[Richard Evelyn Byrd|Richard Byrd]] in 1933.

...lectronics''' represent [[Signal (electronics)|signals]] by discrete bands of [[analog electronics|analog]] [[Electrical potential|levels]], rather than ...supply voltage, corresponding to the "false" ("0") and "true" ("1") values of the [[Boolean domain]] respectively.

[[File:Modern crystal radio set.jpg|right|thumb|upright|A modern reproduction of an antique crystal set. It is tuned to different stations by moving the sli ...t component, known as a [[crystal detector]], originally made with a piece of crystalline mineral such as [[galena]].<ref name="Carr">{{Cite book

...table in their frequency output.<ref name=nahin1>Nahin, Paul ''The Science of Radio'' (Chapter 7), p. 91, figure 7.10. ISBN 0-387-95150-4</ref><ref name ...sure the received signal strength, which necessitates linear amplification of the actual [[carrier wave]].

...r''' is an [[electronics|electronic]] system for generating any of a range of [[frequency|frequencies]] from a single fixed [[quartz clock|timebase]] or ==Types==

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