What is a characteristic of single sideband (SSB) compared to FM?

Single sideband (SSB) is characterized by having a narrower bandwidth compared to frequency modulation (FM). This is a fundamental aspect of SSB operation.

In SSB, only one sideband—either the upper or lower—is transmitted, along with a suppressed carrier. This method of signal transmission is much more bandwidth-efficient than FM, which typically transmits a wider frequency spectrum. SSB commonly requires only about 3 kHz of bandwidth, while standard FM broadcasts can use up to 15 kHz or more, depending on the modulation index.

Because of this narrow bandwidth, SSB signals can allow multiple conversations to be conducted within the same frequency range without interference, making it a preferred choice in amateur radio and other communication settings where bandwidth conservation is critical. This characteristic also contributes to its efficiency in long-distance communications, where signal clarity and the ability to operate in crowded frequency bands are essential.