Amplitude Modulation (AM) is used in various applications, including:
Broadcasting: AM is commonly used in commercial radio broadcasting to transmit audio signals. The audio information, such as music or speech, is modulated onto a carrier signal using AM. This allows for the transmission of radio programs over long distances.
Two-Way Radio Communications: AM is utilized in two-way radio systems, such as aircraft communications, marine radio, and amateur radio. These systems often employ AM for voice communication.
Shortwave Broadcasting: AM is well-suited for long-distance transmission, making it useful for shortwave broadcasting. Shortwave signals can be reflected by the ionosphere, allowing them to be received over large distances.
Citizens Band (CB) Radio: AM is employed in CB radios, which are widely used for personal communication and short-range radio communication in various applications.
Radio Control Systems: AM is utilized in some radio control systems for remote control of devices like model airplanes, cars, and boats.
RFID Systems: Some RFID (Radio Frequency Identification) systems use AM to transmit data between tags and readers. The amplitude variation represents the encoded information.
It's worth noting that while AM has been widely used historically, it has been partially displaced by other modulation techniques, such as Frequency Modulation (FM) and digital modulation schemes, which offer advantages in terms of noise immunity, signal quality, and bandwidth efficiency. Nonetheless, AM remains prevalent in specific applications where its characteristics are advantageous.