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Image from page 54 of "The design and construction of a radio telephone station" (1921)

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説明Identifier: designconstructi00pearTitle: The design and construction of a radio telephone stationYear: 1921 (1920s)Authors: Pearce, W. W Rosendal, D. LSubjects: Publisher: Contributing Library: Paul V. Galvin Library, Illinois Institute of TechnologyDigitizing Sponsor: CARLI: Consortium of Academic and Research Libraries in IllinoisView Book Page: Book ViewerAbout This Book: Catalog EntryView All Images: All Images From BookClick here to view book online to see this illustration in context in a browseable online version of this book.Text Appearing Before Image:The result is that when the four ib waves are s^jpsrimposed upon the ccannion secon-dary, the resultant secondary wave is ofpractically constant amplitude. A diagramof his connections is shown in Figure 6, Thedischargers, DJ Dg, etc., are similar tothe regulation rotary gap except that they areall on the sarne shaft and they are shifted sothat studs on successive discs come oppositethe discharge electrode at times correspondingto one quarter of the angular distance betweenstuds* This method has not bean used very muchin wireless telephony but it may be used a greatdeal more in the near future. ( 3) Vacuuir. Tube Oscillators After it was discovered that the vacuumtube could be used for producing a high frequencVundac^ped wave, this method came to the foreground,especially for wireless telephone work. Thiswas because of its ease of control and greaterefficiency and freedom from external noises. There are at least two available methodsof controlling the output of vacuum tube oscillatorsText Appearing After Image:AACOtff r/M£0 SfiA/ZM- THJ^SfS r^o.^ Xf and instances of each of these in practice vyillbe described. The first of these is by varia-tion of the grid potential, the assumption beingthat as the grid potential becomes increasinglynegative, the current through the tube (and there-fore the available radio frequency output) con-tinuously and proportionately diminishes. Diffi-culties of stability. :)f operation, however, ariseand the conclusion must be somewhat^ modified.The sec-nd of these methods is by varying theplate i£)tential, the assumption in this case be-ing that as the plate potential becomes increas-ingly positive, the current through the tube,(and therefore the available radio fre-juency out-put) continuoup.ly and proportionately increases.This conclusion also requires some r/iOdification,because of temperature and space charge limitationof plate current, and because of the limits ofavailable energy which rriust be thus introducedinto the plate circuit. There are a number of dNote About ImagesPlease note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.
撮影日1921-01-01 00:00:00
撮影者Internet Archive Book Images
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