Which type of voice mode is often used for long-distance (weak signal) contacts on the VHF and UHF bands?

The correct choice for long-distance (weak signal) contacts on the VHF and UHF bands is Single Sideband (SSB) voice mode. SSB is a modulation technique that is particularly efficient for weak signal transmissions.

One of the key advantages of SSB is that it uses less bandwidth compared to Frequency Modulation (FM) and allows for improved signal clarity and reduced noise. This is especially beneficial on VHF and UHF bands, where signals may be faint due to distance or interference from other sources. The ability of SSB to utilize power more effectively also enhances the reach of a transmission, making it ideal for making contacts over longer ranges.

Other modulation methods, such as FM, while widely used for local communication because of their simplicity and clarity in high signal-to-noise ratio environments, do not perform as well for weak signal contacts over long distances. Digital Radio Mondiale (DRM) focuses on digital modes and is not as commonly used in typical voice communication in amateur radio contexts. Phase Modulation (PM) is less commonly recognized or utilized in amateur radio voice communication compared to SSB.

In summary, SSB is favored for its efficiency and effectiveness in reaching distant stations under challenging signal conditions, which is essential for successful