What is the high-end of the usable radio frequency range?

The high-end of the usable radio frequency range is approximately 400 gigahertz. This frequency is significant because it encompasses a portion of the electromagnetic spectrum that includes millimeter waves, which are used in various applications such as advanced radar systems, satellite communications, and some forms of wireless data transmission. Understanding this range is crucial for aircrew members and technicians working with communication systems and radar technology, as it helps in the selection and implementation of appropriate technologies for their operations.

Lower frequencies, such as kilohertz and megahertz options provided, fall well below the high-end of the usable radio frequency range and are typically associated with AM radio and other older communication technologies. The option of 300 gigahertz is close to the high end but does not represent the maximum usable frequency. By knowing that 400 gigahertz is recognized within the context of usable RF communication, you can more effectively understand the capabilities and limitations of radio technologies utilized in aviation and naval operations.