Communications: Single-sideband transmission for land mobile radio: From seven to ten times as many channels could be made available in existing VHF and UHF bands

It is suggested that from seven to ten times as many channels could be made available in existing VHF and UHF bands. FM, AM, and SSB modulation techniques combined with syllabic amplitude and frequency compandors are compared. In the 15- to 30-dB signal-to-noise ratios-the amplitude-compandored SSB system and the amplitude- and frequency-compandored SSB system provide the same or better quality reception than FM systems that have comparable transmitter power. Three to five channels of the narrow-band system can be used between the channels of the 25-kHz spaced FM channels without unacceptable interference on either system. Ten narrow-band channels can operate in the 25-kHz bandwidth if there are no FM channels present.