A COUPLED RESONATOR REFLEX KLYSTRON 



761 



seen that the useable bandwidth depends on the degree of flatness. Thus, 

 if the appUcation requires power to be absolutely constant, the useable 

 bandwidth equals 39 mc; it increases to about 70 mc for a fluctuation 

 in power of d=0.2 db. Fig. 21 also Hsts the values of half power electronic 

 tuning for the oscillograms shown. They are seen to range between 107 

 and 113 mc. 



By way of comparison, the mode shape for the case of a completely 

 decoupled secondary resonator was shown in Fig. 16(a). Its peak power 

 was found to equal about 100 mw, or about twice the power of the flat 

 topped modes of Fig. 21, and its half power electronic range equaled 50 



SINUSOIDAL REPELLER 



SWEEP BEYOND 



EXTINCTION 



SWEEP REDUCED AND HOR- 

 IZONTAL GAIN INCREASED TO 

 ENLARGE FLAT POWER BAND 



f, = 3935 MC 

 f^ = 3974 MC 



Af = 39 MC 

 POWER CONSTANT 

 OVER ABOVE BAND 



Af, 



V2- 



107 MC 



f; — 3928 MC 



fa = 3978 MC 



Af = 50 MC 



POWER FLAT WITHIN 



±0.05 db (APPROX) 



Af|/2= 110 MC 



f, = 3922 MC 

 fg = 3981.4 MC 



Af = 59.4 MC 

 POWER FLAT WITHIN 

 ±0.1 db (APPROX) 

 2 MC 



Af,/,= 



f^ = 3917 MC 

 fz = 3986.6 MC 

 Af = 69.6 MC 

 POWER FLAT WITHIN 

 ±0.2 db (APPROX) 

 Aft/2 = ''3-3 MC 



Vr— *► 



Fig. 21 — Oscillograms showing flat power bands obtainable with coupled 

 resonator reflex klystron. 6BL6 operating in 3 + ^ mode, Vo = 325 F, /* = 28 ma, 

 zero DB power level corresponds to 50 milliwatts. 



