lähetinvastaanotinperiaate

The lähetinvastaanotinperiaate, or transmitter-receiver principle, describes the fundamental operation of devices that both send and receive radio signals. This dual functionality is essential for wireless communication systems. A transmitter converts information, such as voice or data, into an electrical signal which is then modulated onto a radio wave by an antenna. This modulated wave is broadcast through the air.

A receiver, on the other hand, captures these radio waves using its antenna. It then filters out unwanted signals and amplifies the desired one. The modulated signal is demodulated to extract the original information. In many devices, the same antenna is used for both transmitting and receiving, requiring a switching mechanism or a duplexer to manage the signal flow. This allows for two-way communication, enabling devices to talk and listen simultaneously or in rapid succession. Examples include walkie-talkies, mobile phones, and Wi-Fi devices, all of which rely on this core principle to function. The efficiency and range of these devices are heavily influenced by the design of their transmitting and receiving components and the antenna system.