1 



REFLEX OSCILLATORS 



619 



diagram. The effect of varying the impedance on the repeller characteristic 

 in Fig. 108 is to shift the whole characteristic to the right or left, depending 

 upon the phase of the impedance, as well as to change its general form as 

 shown by the dotted curve. It can be seen from this that if the hysteresis 

 is sutliciently bad and if the pulling figure exceeds a particular value, one 



(Joe 



UJuj 



200 

 180 

 160 

 140 

 120 

 100 





-REQUIRED RANGE- 



■1 



ZZ 



4400 4500 4600 4700 4800 

 FREQUENCY IN MEGACYCLES PER SECOND 



Fig. 110. — Performance characteristics of the 2K22 operated into a 50 ohm load. 



effect of the hysteresis will be to reduce the sink margin, and this is found 

 to be the case. Fig. 109 shows an impedance performance diagram obtained 

 with pulsed operation for an early model of the 2K55 in which the hysteresis 

 was excessive. From this it can be seen that the area of the sink on the 

 diagram is very greatly increased and also that the sink margin is reduced 

 from the theoretical value of somewhat in excess of 2 to a value of less than 



