(A typical CB radio uses two "sideband" signals to carry a voice; SSB only uses one.) GMRS also uses Frequency Modulation (FM) as compared to CB radio, which uses Amplitude Modulation (AM).

There was a time when one of the perks of having a ham radio in your car (or on your belt ... So he offered the “PocketCom CB” which was billed as the “world’s smallest citizens band ...

Somehow [hvde] wound up with a CB radio that does AM and SSB on the 11 meter band. The problem was that the radio isn’t legal where he lives. So he decided to change the radio over to work on ...

(Citizen's Band radio) The frequency band of 40 channels for public radio transmission in the 27 MHz band. Introduced in 1945, primarily for farmers and the Coast Guard, CB radio initially ...