What is the signal transmitted in H3E mode?

In H3E mode, the transmission includes a full carrier and the upper sideband. This mode operates as a type of single-sideband amplitude modulation with carrier frequency, primarily used for voice communications in certain marine radio and other communications applications.

The presence of a full carrier allows for more reliable signal detection and can enhance the intelligibility of voice transmissions over long distances, which is particularly crucial in maritime operations. The upper sideband component emphasizes the frequencies above the carrier frequency, effectively optimizing the modulation of voice signals while maintaining the balance between range and clarity. This mode is advantageous in situations where minimal distortion is paramount for effective communication.

In contrast, other options represent different configurations of amplitude modulation, which do not align with the characteristics of H3E. Choices involving just sidebands or a reduced carrier would not provide the same level of clarity and reliability in voice transmissions as H3E mode. Thus, the configuration of H3E with a full carrier and upper sideband is specifically tailored to enhance effective maritime communication, making it the correct choice.