REFLEX OSCILLATORS 



601 



only a second order effect. Because of the small motion required to tune 

 the 2K50 through its range, the tuner dimensions permit reliance on conduc- 

 tion cooHng. 



M 



4^ 



f=23504 MEGACYCLES 

 PER SECOND 



Fig. 93. — Performance diagram for the 2K50 at the low frequency band limit. 



The characteristics of the thermal tuner of the 2K50 differ considerably 

 from the 2K45. In Appendi.x XI expressions are given for the heating and 

 cooHng times as 



kTc 



c , Th 



(13.4) 



(13.5) 



It is desirable that the cycling times should be equal. Equating (13.4) 

 and (13.5) one obtains 



P„, = k{Tn+ r.). (13.6) 



