. The Bell System technical journal . Grid Potential Plate Current Audio Currentin Telephone Fig. 44 The detecting action resulting from the curved plate characteristic isshown in Fig. 44. Equation 13 leads to the result that the output voltage of a detectortube, when working as above, is a maximum when r = i rp. In usingthese relations note that r represents the value of the output resistance THERMIONIC VACUUM TUBES 77 for the high frequency and not the low frequency. When using anamplifier on the output of a detector (see Fig. 45), it is important tochoose r to give the maximum detecting vol
. The Bell System technical journal . Grid Potential Plate Current Audio Currentin Telephone Fig. 44 The detecting action resulting from the curved plate characteristic isshown in Fig. 44. Equation 13 leads to the result that the output voltage of a detectortube, when working as above, is a maximum when r = i rp. In usingthese relations note that r represents the value of the output resistance THERMIONIC VACUUM TUBES 77 for the high frequency and not the low frequency. When using anamplifier on the output of a detector (see Fig. 45), it is important tochoose r to give the maximum detecting voltage. As in amplifier cir-. Fig. 45 cuits it is essential in this type of detector that the grid remain alwaysnegative. See also the sections on amplifiers. 39. Detection by Rectification in Grid Circuit. This type of circuit(see Fig. 46) is now in very general use for radio purposes, and ischaracterized by the grid blocking condenser Cs. Contrary to thepreceding type of detector, the present requires the flow of electronsto the grid and works best when the grid is held permanently at a
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