Ülekandeseade

Ülekandeseade is a device that generates, modulates and transmits signals to a receiving system over a transmission medium, such as air for radio waves or guided media like coaxial cable and optical fiber. It serves as the transmitting counterpart to a receiver and is a key element in telecommunications, broadcasting, and data networks.

A typical ülekandeseade converts electrical power into a signal that can travel through a medium. It includes components such as an oscillator to generate a carrier signal, a modulator to encode information onto the carrier, one or more power amplifiers to increase transmission strength, and an antenna or transmission link to radiate or send the signal. Control electronics manage frequency, power, modulation type, and safety features. In optical systems, the device may use a laser or LED source with an optical modulator and fiber interface.

There are various kinds of ülekandeseadmed depending on the medium and application. Radio transmitters disseminate information via wireless channels (broadcast, cellular, Wi‑Fi, and satellite). Optical transmitters convert electrical signals into light for fiber networks. Data transmitters in wired networks, broadcasting transmitters for television or radio, and specialized telemetry or control transmitters are other examples. Some devices integrate multiple functions, such as transceiver units that also include receiving capabilities.

Regulation and safety are important aspects. Transmission equipment operates within assigned frequency bands and power limits set by national and international authorities (for example, ITU, national communications regulators). Equipment may require type approvals or licensing, and there are exposure limits for electromagnetic emissions in accordance with health and safety standards.