Title :
A New System of Frequency Modulation
Author_Institution :
Zenith Radio Corporation, Chicago, Illinois
Abstract :
The development of a new phase-modulator tube is described. In a concentric structure of conventional dimensions, a radial electron stream is shaped into a wave-like pattern which progresses continuously around the cathode. Phase shift, 12 to 16 times larger than in conventional modulators, is produced by electro-magnetic deflection. The failings of early models are analyzed and the steps are reviewed which resulted in the development of a satisfactory tube structure.
Keywords :
Anodes; Bars; Cathodes; Electron beams; Frequency conversion; Frequency modulation; Laboratories; Oscillators; Phase modulation; Radio transmitters;
Journal_Title :
Proceedings of the IRE
DOI :
10.1109/JRPROC.1947.226196
