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Use of Subcarrier Frequency Modulation in Communication Systems

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1 Author(s)
Bliss, W.H. ; Assistant Professor of Electrical Engineering, University of Maine; summer vacation period, Terminal Facilities Research Group, R.C.A. Communications, Inc., New York, N.Y.

When subcarrier frequency modulation having a frequency range of 1600 to 2000 cycles was used for transoceanic facsimile transmission, pictures were obtained with finer detail and better half-tone quality than those transmitted by previous systems; the speed of transmission could also be increased. An extension of the system to a two-way multiple-channel radio-relay circuit providing teletype service between New York and Philadelphia gave improved stability of operation when variations in signal strength occurred.

Published in:

Proceedings of the IRE  (Volume:31 ,  Issue: 8 )