MAGNETIC GENERATION OF A GROUP OF HARMONICS 439 



A typical circuit used for the simultaneous generation of a number of 

 odd and even harmonics at approximately equal amplitudes is shown 

 schematically in Fig. 1. Starting with the fundamental frequency 



Fig. 1 — Circuit diagram of channel harmonic generator. 



input, a sharply selective circuit (F) is used to remove interfering com- 

 ponents, and an amplifier {A) provides the input to the harmonic 

 generator. The shunt resonant circuit (LoCo) tuned to the funda- 

 mental serves primarily to remove the second harmonic generated in 

 the amplifier. The elements CiLi are inserted to maintain a sinusoidal 

 current into the harmonic producer proper, as well as to tune out the 

 circuit reactance. 



"# ii i»MH l > i 



Fig. 2 — Cathode ray oscillogram of output current wave form with fundamental input 



current as abscissa. 



