REFLEX OSCILLATORS 



VIII. Hysteresis 



493 



All the analysis presented thus far would indicate that if a reflex oscillator 

 is properly coupled to a resistive load the power output and frequency will 

 be single-valued functions of the drift time or of the repeller voltage, as 

 illustrated in Fig. 18. During the course of the development in these labora- 

 tories of a reflex oscillator known as the 1349XQ, it was found that even if 



NEGATIVE REPELLER VOLTAGE >■ 



Fig. 18. — Ideal variation of power and frequenc\- with repeller voltage, arbitrary units. 



the oscillator were correctly terminated the characteristics departed vio- 

 lently from the ideal, as illustrated in Fig. 19. Further investigation dis- 

 closed that this departure was, to a greater or less degree, a general charac- 

 teristic of all reflex oscillators in which no special steps had been taken to 

 prevent it. 



The nature of this departure from expected behavior is that the output is 

 not a single valued function of the repeller voltage, but rather that at a given 

 repeller voltage the output depends upon the direction from which the repel- 



