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BELL SYSTEM TECHNICAL JOURNAL 



plate cavity to provide for a limited adjustment of the bandwidth of the 

 circuit. These are not always used, however, and most of the data to be 

 presented here are for the condition of no external resistive loading. 



Fig. 5. — Bottom view of circuit. 



Fig. 6. — Exploded view of details. 



f2±f, 



Fig. 7. — Elementary grounded grid converter schematic. 



Modulator 



The grounded grid transmitting converter shown schematically in Fig. 

 7 includes the two generators, a microwave beating oscillator, /o, and an 

 intermediate frequency signal, /i, which impress voltages on the cathode, 



