. Elements of radio telephony . Fig. 18.—Voltage and rectified currents as indicated in Fig. 17. of a very large number of turns wound on an iron core. Theenergy is transferred to the condenser Ca which acts asanother storage reservoir and serves to still further smoothout the variations. Coil Li is shunted by another condenserC2, and the two values are adjusted so that they are resonanttogether at the supply frequency. This, as can be math-matically shown, produces a very high resistance to thepassage of currents of this particular frequency and is an 38 ELEMENTS OF RADIO TELEPHONY additional
. Elements of radio telephony . Fig. 18.—Voltage and rectified currents as indicated in Fig. 17. of a very large number of turns wound on an iron core. Theenergy is transferred to the condenser Ca which acts asanother storage reservoir and serves to still further smoothout the variations. Coil Li is shunted by another condenserC2, and the two values are adjusted so that they are resonanttogether at the supply frequency. This, as can be math-matically shown, produces a very high resistance to thepassage of currents of this particular frequency and is an 38 ELEMENTS OF RADIO TELEPHONY additional aid to the elimination of the low-frequency irregtdar waves are composed of a large number ofmultiple-frequency waves the single-frequency trap cannot. Fig. 19.—Hot cathode or Kenotron rectifier,ampere at 100,000 volts. Normal rating eliminate all of the distm-bing variation. If it is desiredto smooth out the wave stiU further, other sections of seriesinductance and shunt capacity may be added with increas-ingly better results. With properly designed filter .systems VACUUM TUBE OSCILLATORS 39 ! direct-current voltages may be produced which comparevery favorably with those produced by direct-current gen-erators, and which are very well suited for radio telephony. Cold-cathode Rectifiers.—^A cold-cathode rectifier hasrecently been developed by one manufacturer. This appa-ratus consists of two electrodes mounted inside a glass bulbin a much-reduced atmosphere of certain gases. Its opera-tion hinges on the pecuhar effects of ionization by collisionas experienced in the action of soft detector tubes imderwhich heading this action is treated in some detail. Theelectrodes are so arranged that all electrons passing fromone of the ele
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectradio, bookyear1922
