FM 1489 is a type of radio frequency modulation used in communication systems. It allows for the transmission of audio signals over long distances by converting sound waves into radio waves. This technology is commonly used in various applications, including broadcasting and two-way radio communications. The designation "FM" stands for frequency modulation, which means that the frequency of the carrier wave is varied in accordance with the audio signal. FM 1489 is part of a broader category of FM radio frequencies, which are known for their resistance to noise and interference, making them ideal for clear audio transmission.