What frequency range is used by modern voice communications systems?

The VHF band, spanning from 118.0 to 136.975 MHz, is the frequency range that is utilized by modern voice communication systems in aviation. This range is specifically designated for aeronautical operations, allowing clear and effective communication between pilots and air traffic control, as well as within other aircraft. The characteristics of the VHF band, such as its relatively short wavelength, enable reliable line-of-sight transmission, which is essential in aviation environments.

In contrast, the UHF band is primarily used for other forms of communication like military operations and land mobile radio systems, rather than standard aeronautical voice communications. The HF band, while used in aviation for long-distance communications, is not typically associated with everyday voice communications due to its susceptibility to interference and atmospheric conditions. The AM band primarily caters to standard radio broadcasting and is not suited for aviation communication due to its frequency range and modulation type, which do not provide the clarity and reliability required for flight operations.