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A New System of Frequency Modulation

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1 Author(s)
Adler, Robert ; Zenith Radio Corporation, Chicago, Illinois

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.

Published in:

Proceedings of the IRE  (Volume:35 ,  Issue: 1 )