The thermionic vacuum tube and its applications (1920)
Van der Bijl, Hendrik Johannes, 1887- · New York McGraw-Hill Book, Co · leaf 366
re this in j^ractice is first to adjust the negative grid battery DETECTION OF CURRENTS WITH THE VACUUM TUBE 343 E F in the input circuit of the modulator to a vakie —-\--^; that is, to a value given bj^ OD (Fig. 204), and then gradually increasethe strength of the low frequency input voltage until… … -0.6 -0.8 Fig. 205. fiequency impressed on the modulator can also be measured inthe same way and should in general be somewhat smaller than thelow frequency voltage. Finally the grid battery in the inputcircuit of the modulator is adjusted to the value OC, before themeasm-ements on the detecting…
Telegraph, Wireless
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