WIDE RANGE MICROWAVE SWEEPING OSCILLATOR 559 



frequencies, both the admittance Vu and the transadmittance F21, are 

 complex quantities which vary with frequency as shown by Llewellyn 

 and Peterson. The 4-pole box shown represents the passive radial line 

 between the glass seal at the edge of the tube and the cathode-grid gap. 

 This line is heavily loaded with dielectrics and is believed to be elec- 

 trically about a quarter wavelength long at 4000 Mc. The inductance 

 connected to the anode is that of the anode pin itself and the coaxial 

 center-conductor attached to it. A series resistor Rl is added to include 

 the effects of cavity losses and loading by the output coupling window. 

 Ct is the tuning capacitor which varies with tuning plunger position. The 

 inductance L/ is the feedback reactance introduced by the screws con- 

 nected to the grid disk. 



5. Acknowledgments 



I wish to acknowledge the assistance of Messrs. J. A. Morton, R. M. 

 Ryder, and the late A. E. Bowen for many helpful suggestions in the 

 design of this oscillator. 



