An Experimental SSB-FM System

By the use of the proper combination of angle modulation and amplitude modulation, it is possible to generate a wave which may be detected without distortion on a conventional FM detector, but which has all its energy concentrated on one side of the carrier. A (SSB-FM) transmitter has been constructed by implementing each part of the mathematical equation for this wave. The signal generated by this transmitter was found to have approximately two thirds of the bandwidth of a conventional FM signal with the same deviation index. The amplitude modulator is required to have response to dc, and a considerable increase in transmitted power is necessary during modulation.