Thus, the information signal is often referred to as the modulating signal (it is also occasionally called the message signal). The actual information signal then modulates this carrier signal. First, a carrier signal must be generated. The receiver then deciphers and processes the information contained in the transmitted signal.Ī transmitter’s functionality is achieved through a series of steps. After traveling some distance, the transmitted signal eventually reaches the receiving antenna of a receiver. In essence, a transmitter launches signals into the air via a transmitting antenna. These signals contain information, which can be audio, video, or data. Part 2, which will appear in the April issue of Microwaves & RF, will focus on additional transmitter implementations, as well as delve into modern digital techniques.Īs its name implies, the general purpose of a transmitter is to transmit signals. This article, Part 1 of a two-part series, provides a general overview of transmitters, including discussion of classical AM and FM transmitters. Moreover, aircraft, radar systems, and many other applications depend on transmitters to enable communication. In addition, many people today still listen to AM and FM radio stations, which obviously require transmitters to broadcast programs. The explosion of mobile communications means that many people actually have a transmitter right in their pocket. Simply put, the purpose of a transmitter is to transmit signals that contain some form of information. A transmitter is no doubt a critical part of any communications system.
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