A COUPLED RESONATOR REFLEX KLYSTRON 



'53 



whence the numerator of equation 4.1 follows as 



dV, 



3.6 



(3.6F« + 665)^ 



10 ' sec/volt. 



(4.5) 



It remained only to replace the 6BL6 in the fixed tuned primary 

 cavity, in which all subsequent tests were performed, and to determine 

 the midmode repeller voltage and frequency. These values were found 

 to be 96 volts and 3800 mc respectively, thus yielding by substitution 

 into equation (4.5), 



dVn 



3.6 X 10" 



(3.6 X 96 + 665)2 



= 3.52 X 10"'' sec/volt. 



The demoninator of equation (4.1) simply denotes the "modulation 

 sensitivity" at the center of the mode. A simple measurement estab- 



85 90 95 100 105 



120 125 130 



Fig. 17 — Experimental determination of the relation between frequency and 

 repeller voltage. Points shown were obtained with a 6BL6 in tunable primary 

 cavity of Fig. 14 with secondary cavity completely decoupled and operation in the 

 Z -\- % repeller mode at a beam voltage, Fo = 325 F. Frequency was varied by 

 means of tuning plungers and repeller voltage recorded for maximum power out- 

 put. Relation is given by,/ = (13.5Fr + 2495) mc. 



