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Radio call signs are a globally unique identifier assigned to all stations that are required to obtain a license in order to emit RF energy. The identifiers consist of from 3 to 9 letters and digits, and while the basic format of the call signs are specified by the ITU-R Radio Regulations, Article 19, Identification of stations, [5] the details are left up to each country's radio licensing ...
Radio propagation is the behavior of radio waves as they travel, or are propagated, from one point to another in vacuum, or into various parts of the atmosphere. [1]: 26‑1 As a form of electromagnetic radiation, like light waves, radio waves are affected by the phenomena of reflection, refraction, diffraction, absorption, polarization, and scattering. [2]
Telecommunication – the transmission of signals over a distance for the purpose of communication. In modern times, this process almost always involves the use of electromagnetic waves by transmitters and receivers, but in earlier years it also involved the use of drums and visual signals such as smoke , fire , beacons , semaphore lines and ...
Generally, to receive a radio wave one needs a radio antenna with length that is one-fourth of wavelength. [2] For low frequency radio waves, wavelength is on the scale of kilometers and building such a large antenna is not practical. In radio communication, the modulated carrier is transmitted through space as a radio wave to a radio receiver.
In the context of mobile radio communication systems, RF planning is the process of assigning frequencies, transmitter locations and parameters to a wireless communications system to evaluate coverage and capacity. Coverage is the distance at which the RF signal has sufficient strength to sustain a call/data session.
The word radio is derived from the Latin word radius, meaning "spoke of a wheel, beam of light, ray".It was first applied to communications in 1881 when, at the suggestion of French scientist Ernest Mercadier [], Alexander Graham Bell adopted radiophone (meaning "radiated sound") as an alternate name for his photophone optical transmission system.
Amateur radio; Direction finding; Radio broadcasting. AM broadcasting; FM broadcasting; Shortwave broadcasting; Radar; Radio astronomy; Radio navigation; Radiotelephone; Software-defined radio; Two-way radio (Aviation, Land-based commercial, Government, Marine) Mission critical communication TETRA and P25; Wireless power transfer
A broadcasting antenna in Stuttgart. Broadcasting is the distribution of audio or video content to a dispersed audience via any electronic mass communications medium, but typically one using the electromagnetic spectrum (radio waves), in a one-to-many model. [1]