Which of the following is a digital communications mode?

• A. SSB
• B. Packet radio, IEEE 802.11, FT8
• C. Morse code
• D. FM voice

Answer: (B)

Digital communications modes are those that transmit information using digital signals instead of analog. The presence of multiple examples in the choice reinforces the correct identification of this category.

Packet radio is a digital technique that allows for the transmission of data—both text and files—using packets of information over radio waves. It utilizes error correction and allows users to send messages in a reliable way, making it particularly useful for data communications and remote operations.

IEEE 802.11, commonly known as Wi-Fi, is another digital communication technology that enables wireless networking, incorporating various methods to encode and transmit data.

FT8 is specifically a digital mode used for weak signal communication among amateur radio operators. It is a form of phased communication allowing operators to make contacts even under challenging conditions.

In contrast, single sideband (SSB) and frequency modulation (FM) voice are primarily analog communication modes, as they modulate the radio signal in a continuous form rather than working with discrete data packets. Morse code, while an effective digital signaling method in its own right, traditionally operates in an analog context because it is transmitted as a series of tones or lights rather than as digital data.

Thus, the presence of packet radio, IEEE 802.11, and FT8 highlights the essence