The key difference lies in how they encode sound information:
AM (Amplitude Modulation) changes the amplitude (height) of the wave to match the sound signal. It’s simpler but more prone to interference from electrical sources, weather, and buildings.
FM (Frequency Modulation) changes the frequency (how close the waves are) to encode sound. It offers better sound quality and is more resistant to static and interference.
FM provides superior sound quality because it uses frequency changes to encode data, which makes it less vulnerable to noise and interference. Since most interference affects amplitude rather than frequency, FM stations maintain clearer audio. Additionally, FM stations have more bandwidth, allowing for better fidelity and stereo sound.
Radio waves are a type of non-ionizing electromagnetic radiation in the frequency range from 3 kHz to 300 GHz. They are generated by transmitting devices that produce alternating current (AC) oscillations at specific frequencies. These waves are emitted from antennas and propagate through the atmosphere. Devices like transmitters and antennas modulate these waves to carry information such as music, voice, or data.
The radio frequency (RF) spectrum is a part of the electromagnetic spectrum used for radio communication. It ranges from 30 Hz to 300 GHz and is divided into bands like VLF (Very Low Frequency), HF (High Frequency), VHF (Very High Frequency), and UHF (Ultra High Frequency). Different services—like TV, radio, GPS, cellular networks, and military communications—are allocated specific frequency ranges to prevent interference.
