762 



THE BELL SYSTEM TECHNICAL JOURNAL, MAY 1953 



mc. The price, then, we must pay for a better than two fold increase 

 in electronic tuning and for a frequency range of constant power is a 3 

 db loss in the available power output. 



Using the tunable primary cavity shown in Fig. 15, the mode per- 

 formance just described could be obtained about any center frequency 

 between 3700 and 4200 mc. 



5.0 APPLICATIONS OF THE COUPLED-RESONATOR REFLEX KLYSTRON 



A numer of applications making use of the variety of mode shapes 

 which may be obtained with the coupled resonator reflex klystron were 

 indicated in the introductory section of this paper. Some of these ap- 

 plications were tried experimentally and are described below, others, 



USE OF COUPLED-RESONATOR REFLEX 

 KLYSTRON IN GAIN COMPARATOR TO DISPLAY 

 BANDPASS CHARACTERISTIC OF MICROWAVE 

 CHANNEL FILTER. TOP TRACE REPRESENTS 

 INCIDENT POWER, LOWER TRACE TRANS- 

 MITTED POWER. 



CENTER FREQUENCY OF FILTER = 3810MC 

 PASS BAND = 28 MC 



USE OF COUPLED -RESONATOR REFLEX OSCILLOSCOPE DISPLAY FOR SAME 



KLYSTRON AS SWEPT FREQUENCY SOURCE RESONATOR RESULTING FROM USE OF 



IN DETERMINATION OF Q OF UNKNOWN CONVENTIONAL KLYSTRON AS SWEPT 



RESONATOR BY REFLECTED POWER METHOD. FREQUENCY SOURCE 

 TOP TRACE REPRESENTS POWER INCIDENT 

 UPON CAVITY UNDER TEST, MIDDLE TRACE 

 REFLECTED POWER AND LOWER TRACE 

 ZERO POWER LEVEL. (NOTE FLATNESS 

 OF INCIDENT POWER TRACE) 



Fig. 22 — Examples of application of coupled resonator reflex klystron as 

 microwave sweeper. 



