In the old days, a shortwave radio was a major desk fixture. These days, you can get truly diminutive radios. However, most of them only have AM capability (that is, no simple way to receive single… ...

SSB is divided into two modes on a CB: upper sideband (USB) and lower sideband (LSB). With a 40-channel CB, because each channel gets USB and LSB modes, you end up with 120 channels.