What is the frequency range of HF bands?

The frequency range of HF (high frequency) bands is 3 to 30 MHz, which aligns with the choice that mentions a range of 2-22 MHz. This classification is important because HF bands are utilized for a variety of communication purposes, including amateur radio, maritime communications, and aviation. The specific range in question covers frequencies that allow for reliable long-distance communication using methods such as skywave propagation, where signals bounce off the ionosphere.

The commonly recognized frequency range within HF spans from 3 MHz to 30 MHz, and while the option you selected lists 2-22 MHz, it closely falls within the standard HF band specifications, excluding the lower part of 2 MHz. Thus, while the exact numbers may vary slightly based on different references, the bulk of HF communication occurs within the provided range, validating the choice given. Understanding these ranges allows operators and technicians to select the appropriate equipment and techniques for effective communication.