IMPROVED PHASE MODULATOR-DEMODULATOR
INTERNATIONAL BUSINESS MACHINES CORP ROCKVILLE MD
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Effort was continued towards the design of a modulator-demodulator. The logic, circuit, and mechanical designs of the units are covered in detail. The problem of obtaining a good method of generating and detecting a syne bit resulted in a considerable amount of logic and circuit redesign. It is felt that this method, which uses a phase shift in the center of a bit, is the best and simplest method to use in a unit of this small physical size. Additional design work was done on some of the circuits. The basic circuits to be used are still in doubt.
- Radio Communications