In which band is SSB mainly used for communications?

Single Sideband (SSB) modulation is predominantly used for communications in the High Frequency (HF) band. This is due to several factors that favor SSB in HF communications. First, SSB is more efficient in terms of power usage and bandwidth compared to other modulation methods like amplitude modulation (AM). This efficiency is particularly important in HF, where signal propagation can depend significantly on atmospheric conditions and the distance of communication.

Moreover, HF bands are particularly suited for long-distance communication, often referred to as "skip" or "DX" communications. These bands can reflect radio waves off the ionosphere, allowing signals to travel over vast distances. SSB takes advantage of this capability while maintaining a narrower bandwidth, allowing for more efficient use of frequency allocations and minimizing interference with other operators.

VHF and UHF bands, while still supporting SSB, are more commonly used for applications requiring line-of-sight propagation and have a focus on modulation methods better suited to their characteristics, such as FM. SHF is generally used for higher-frequency applications, such as microwave communications, which do not typically lend themselves to SSB due to the nature of the communication technologies involved. Therefore, the best use of SSB modulation is in the HF band, where its advantages