The thermionic vacuum tube and its applications (1920)
Van der Bijl, Hendrik Johannes, 1887- · New York McGraw-Hill Book, Co · leaf 341
cing mod-ulation and detection. 98. Modulation. Suppose that a tube be inserted in a cir-cuit such as that shown in Fig. 187. Let high frequency currentsbe impressed at H. F. and low frequency currents, lying withinthe audible range, at L. F. The total input voltage on the tubeis then, e = ei sin… … Fig. 187. tube as a modulator, we are interested only in currents having P-i-Q frequencies lying within the range ^tt— . Hence, substituting Ztt (10) into (9), evaluating and dropping all terms having frequencies lying outside of tliis range, we obtain, J = aiei sin pt-\-2a2eie2 sin pt sin qt. (11)…
Telegraph, Wireless
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