MAGNETRON AS GENERATOR OF CENTIMETER WAVES 



2HI 



wavemeters, output couplings, and loads. On the other hand, the new 

 development did provide the opportunity to make use of new ideas and 

 developments, some of which, although already completed, could not be 

 used in magnetrons then in manufacture. 



When work ou this new series of magnetrons was commenced, the art 

 of magnetron development had reached the stage where for the first time 

 it was possible to make a reasonably satisfactory approach to the problem 

 of a new design. The principles of magnetron scaling had been worked 



Fig. 49 — A sectioned 5J23 magnetron (275 k\v., ^^1050 mc/s) showing, among other 

 things, the echelon type of wire strapping and coaxial output circuit with contact-free load 

 connector. 



out and tested in detail, enabling one to make use of results obtained or 

 verified at different frequencies. The mode frequency spectrum of a 

 magnetron resonator system was now understood and the means of con- 

 trolling it by strapping w^ere in use. The problem of the output circuit 

 was in hand. Magnetrons were being "preplumbed" and the problems 

 of reproducibility were being solved. Furthermore, the method of study- 

 ing each of these magnetron characteristics by CW measurements on 

 resonator blocks and output circuit models had advanced to the point where 

 it was possible to complete a design in detail before an operating magnetron 

 had been constructed. Such a procedure was adopted for the new series of 



