Improvements in and relating to methods of selecting rectifiers for balanced modulators of ring type

摘要

630,083. Modulating systems. TUCKER, D. G. Oct. 8, 1946, No. 29942. [Class 40 (v)] Non --linear resistors for a balanced ring type modulator are so selected and arranged as to give an output which is a minimum for even harmonics of the carrier frequency. Any three of the resistors, e.g. 1, 2, 3, are selected at random and the fourth is selected by trial to give a. minimum output at the fundamental frequency of the carrier which is supplied at 8. Either pair of resistors, e.g. 1 and 3 or 2 and 4, are now interchanged and a final balance is achieved by adjustment of potentiometer 5.