Ham Radio Extra Class Practice Test 2025 - Free Extra Class License Exam Questions and Study Guide

The preferred mode for voice communications in amateur radio is Single Sideband (SSB). SSB is a refined version of amplitude modulation (AM) that eliminates the carrier wave and reduces the bandwidth needed for transmission. This allows for a more efficient use of the radio spectrum and enhances the quality of the transmission by increasing the power-to-bandwidth ratio, which helps to improve signal strength and allows for clearer conversations, especially over long distances.

SSB is particularly effective in HF (high frequency) bands, where it is less susceptible to noise and interference compared to other modes. Operators using SSB can communicate over greater distances while using less power compared to AM. This is especially important for amateur radio operators who often work with limited power outputs and may wish to make contacts over vast geographical areas.

In comparison, while FM (Frequency Modulation) is also used for voice communications and provides good sound quality, it is primarily utilized in VHF/UHF (very high frequency/ultra high frequency) bands and has a higher power requirement, making it less efficient for long-distance communications. AM, though historical and often used for local communication, does not effectively utilize bandwidth and can be more susceptible to interference. Meanwhile, CW (Continuous Wave) is not a voice mode