11-3] 



TRAVELING WAVE TUBES FOR HIGH POWER 



597 



The importance of these advantages depends upon the degree of system 

 sophistication and performance that is desired. For the simpler systems, 

 the magnetron is usually chosen. For more advanced systems, the benefits 

 of using a power amplifier become increasingly important. A photograph 

 and typical performance data of a high-gain klystron amplifier suitable for 

 airborne radar are shown in Fig. 11-23. 



Fig. 11-23 The VA-24B Klystron Amplifier Which Produces 50 kw Power Output 

 at 0.002 Duty Cycle, with 57-db Gain and 25-Mc Bandwidth at X-Band Fre- 

 quencies. 



11-3 TRAVELING WAVE TUBES FOR HIGH POWER 



Although traveling wave tubes have been under intensive engineering 

 development for more than a decade, it is only recently that much effort 

 has been devoted to models that might be suitable for airborne radar 

 transmitter applications. None of these high-power traveling wave tubes 



