226 



BELL SYSTEM TECHNICAL JOURNAL 



TABLE 1 



Terms in the First Four Orders of Modulation 



P cos (pt — 6) AND Q cos (qt — (j)) 



General Expression for Current Output 

 Ii = A^ + AiE+ AiE? + A^E^ + etc. 



TO RESONANT CIRCUIT 



o 



CARRIER INPUT 

 Fig. 7 — Schematic diagram of modulator 



impress instantaneous voltages of opposite signs on thie two tubes, 

 while the carrier windings impress instantaneous voltages of the same 

 sign on the tubes. The output transformer is connected so that the 

 algebraic difference of the two plate currents appears in the output 



