Udsender

Udsender is a Danish term for a device or person that emits signals, messages, or broadcasts. In electronics and telecommunications it is commonly translated as transmitter. A transmitter converts an electrical input signal into a radio‑frequency or optical signal and radiates it through an antenna or fiber. In two‑way systems, the transmitter is often paired with a receiver to form a transceiver.

The word derives from the Danish verb at sende ("to send") with the prefix ud- indicating outward action.

A typical udsender includes a frequency source (oscillator), a modulator to encode information, a power amplifier to raise signal strength, and an antenna or optical emitter. Modern equipment often combines the transmitter with a receiver and digital processing hardware to support various modulation schemes and data rates.

Udsendere are used in radio broadcasting (AM/FM), television, cellular base stations, satellite links, Wi‑Fi and other wireless networks, and point‑to‑point links. They may operate in licensed or unlicensed bands and support formats such as AM, FM, QAM, PSK, and OFDM.

Transmitters are regulated by national authorities to minimize interference and ensure safe operation. Licenses, frequency allocations, power limits, and technical standards are typically required. High‑power transmitters can cause interference and exposure concerns, requiring proper siting, shielding, and safety practices.