;q4 



BELL SYSTEM TECHNICAL JOURNAL 



50 



3(0 



o5 



uj=! 20 



Q.Z 



- 10 



:a: O 



U i/l lil 



O 80 



; o 70 



8800 9000 9200 9400 9600 



FREQUENCY IN MEGACYCLES PER SECOND 



9800 



Fig. 86. — Characteristics of the W.E. 2K45 reflex oscillator. Fig. 86-a shows the varia- 

 tion of the power output as a function of frequency in two cases. The curves A, B and C 

 illustrate the power variation with frequency when the repeller voltage is set for the opti- 

 mum at the indicated frequency and held tixed as the cavity tuning is changed. The 

 envelope of these curves shows the power variation with frequency when the repeller 

 voltage is maintained at its optimum value for each frequency. 



In Fig. 86b the electronic tuning is shown, in one case where the repeller voltage is 

 shifted between half power points so slowly that thermal equilibrium exists at all times 

 and in the dynamic case in which the repeller voltage is shifted at a 60 cycle rate. 



8800 9000 9200 9400 



FREQUENCY IN MEGACYCLES PER SECOND 



9800 



Fig. 87. — Repeller voltage for optimum power as a function of frc(|ucncy for the W.E. 

 2K4.S oscillator. 



Fig. 87 shows ihc variation of repeller voltage for optimum power with 

 frequency. This variation is so nearly linear that it has been proposed that 



