Image from page 54 of "The design and construction of a radio telephone station" (1921)
Contributing Library: Paul V. Galvin Library, Illinois Institute of Technology
Digitizing Sponsor: CARLI: Consortium of Academic and Research Libraries in Illinois
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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 oscillators
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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 d
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