lähetinvastaanotinperiaatetta

The lähetinvastaanotinperiaate, or transceiver principle, describes the fundamental operation of a device that can both transmit and receive radio waves. This principle is at the core of most modern wireless communication systems. A transceiver combines the functions of a transmitter and a receiver into a single unit. The transmitter generates and sends out radio signals, while the receiver detects and interprets incoming radio signals. These two functions typically share common components, such as an antenna and a frequency synthesizer, to optimize efficiency and reduce size and cost.

In operation, the transmitter modulates a carrier wave with information, such as voice or data, and amplifies it before sending it through the antenna. The receiver, on the other hand, captures incoming radio waves using the same antenna. It then filters, amplifies, and demodulates the signal to extract the original information. The transceiver must be able to switch rapidly between transmitting and receiving modes, often using a device called a duplexer. The duplexer allows the antenna to be used for both transmitting and receiving simultaneously or in very rapid succession without interference. This principle is essential for devices like mobile phones, Wi-Fi routers, and radio communication systems used in aviation and emergency services.