Which of the following is a form of amplitude modulation?

• A. Frequency modulation
• B. Single sideband
• C. Phase modulation
• D. Pulse modulation

Answer: (B)

Single sideband (SSB) is indeed a form of amplitude modulation, specifically an advanced form of amplitude modulation that improves the efficiency of power usage and bandwidth. Traditional amplitude modulation (AM) transmits information by varying the amplitude of the carrier wave. In contrast, SSB works by removing one of the sidebands and the carrier frequency, leaving only a single sideband (either upper or lower). This makes SSB much more efficient in terms of spectrum use and power, as it uses less bandwidth and reduces the required power for transmission.

Bandwidth efficiency and reduced power requirements in communications make SSB a popular choice for voice transmission in amateur radio and other forms of communication. It allows for clearer transmissions over longer distances, particularly in crowded frequency bands, which is a key advantage for amateur radio operators.