530 



BELL SYSTEM TECHNICAL JOURNAL 



As has been stated, one of the most serious effects of such mismatched 

 long line or resonant loads is that on the electronic tuning. For instance, 

 consider the circuit admittance curve to be that shown in Fig. 47, and the 

 minus electronic admittance curve to be a straight line extending from the 

 origin. As the repeller voltage is varied and this is swung down from the 

 -\-B axis its extreme will at some point touch the circuit admittance line 



r- 



- i=-S^-^ 



■^ 



r-T 



> 



M = 1 00 



M5=200 



0.25 0.50 



0.75 1.00 1.25 



CONDUCTANCE, G 



Fig. 44. — Susceptance vs conductance for the same resonators as of Fig. 43 coupled 

 by a one-eighth wave line. 



and oscillation will commence. As the line is swung further down, the 

 frequency will decrease. Oscillation will increase in amplitude until the 

 — Ye line is perpendicular to the I' line. From that point on oscillation 

 will decrease in amplitude until the — Ye line is parallel to the Y curve 

 on the down side of the loop. Beyond this point the intersection cannot 

 move out on the loop, and the frequency and amplitude will jump abruptly 

 to correspond with the other intersection. As the — 1% line rotates further, 



