FM

Frequency Modulation (FM) is a method of encoding information in a carrier wave by varying its frequency. Unlike Amplitude Modulation (AM), which varies the amplitude of the carrier wave, FM changes the frequency to transmit data. This modulation technique is particularly effective in reducing noise and interference, making it ideal for high-fidelity audio transmissions. UHF radios operate in the frequency range of 300 MHz to about 520 MHz, which is well-suited for short-range communication, such as in sparse bushland, vehicle-to-vehicle, or within buildings. The use of FM in these radios ensures clearer audio quality and better resistance to interference from other electronic devices or atmospheric conditions. FM modulation in UHF handheld radios also allows for more efficient use of the available bandwidth. This efficiency enables multiple channels to operate within the same frequency band without significant cross-channel interference.