What is single sideband?
To understand single-sideband (SSB), one must first have a picture of what’s going on in a normal AM (amplitude modulation) transmission. For example, on Channel 21 (in North America, Australia, and Europe), a “carrier” is transmitted at 27.215 MHz. Your voice (or whatever you’re transmitting) is used to change (modulate) the height (amplitude) of the signal so that it can be reconstructed as your voice on the receiving end. Actually, the amplitude of the carrier does not change. The addition (modulation) of another signal, like your voice, onto the carrier will increase the amplitude at other frequencies adjacent to the the carrier. A 300 Hz tone, for example, would add signals 300 Hz above and below the carrier. Every frequency component of your voice has the same additive effect. These modulation effects are the upper and lower sidebands of the transmitted signal. Normal AM transmissions include the carrier signal, the upper sideband (USB) and lower sideband (LSB). The difference in
