radiofrekvente

Radiofrekvente, also known as radio frequencies, are a type of electromagnetic radiation with wavelengths in the electromagnetic spectrum longer than those of microwaves and shorter than those of infrared light. They are used for various purposes, including communication, broadcasting, and navigation. Radiofrekvente are typically measured in Hertz (Hz), with the range extending from 3 kHz to 300 GHz. This range is further divided into several bands, each with specific applications and regulations.

The lowest frequency band, known as the Extremely Low Frequency (ELF) band, ranges from 3 Hz to 300 Hz. This band is used for submarine communication and some power line communication systems. The Very Low Frequency (VLF) band, ranging from 3 kHz to 30 kHz, is used for long-range navigation and communication, such as the Loran system. The Low Frequency (LF) band, from 30 kHz to 300 kHz, is used for AM radio broadcasting and maritime communication.

The Medium Frequency (MF) band, ranging from 300 kHz to 3 MHz, is used for AM radio broadcasting and aviation communication. The High Frequency (HF) band, from 3 MHz to 30 MHz, is used for shortwave radio broadcasting, amateur radio, and over-the-horizon radar. The Very High Frequency (VHF) band, ranging from 30 MHz to 300 MHz, is used for FM radio broadcasting, television broadcasting, and two-way radio communication. The Ultra High Frequency (UHF) band, from 300 MHz to 3 GHz, is used for television broadcasting, mobile phones, and wireless LANs.

The Super High Frequency (SHF) band, ranging from 3 GHz to 30 GHz, is used for satellite communication, microwave ovens, and wireless LANs. The Extremely High Frequency (EHF) band, from 30 GHz to 300 GHz, is used for experimental and military applications, such as radar and communication. Each of these bands has specific characteristics and applications, making radiofrekvente a versatile and essential part of modern technology.