The name “radio” originates from the beginnings of the radio engineering. Thus it gave around 1890 Knallfunkensender and 1906 Löschfunkensender. Even on the Titanic was used still another Löschfunkensender. These transmitters produced slamming sparks - as by-product here also the radio waves developed.
With the voice transmission or with the Morsen several persons send alternating on the same channel (usually a frequency or a pair of frequencies), so that communication is possible into both directions.
Apart from dot-and-dash signals and language become also standing and moved pictures, for example meteorological satellite pictures or television, and electronic utilizable data of all kinds transmit.
In the recent history of the radio engineering communication protocols become frequently direct such as GSM , UMTS (both for mobile telephones), 802,11 (wireless computer network ) by the devices or Bluetooth (wireless communication with digital peripheral devices) uses.
Although the technology became nowadays a completely different one, the named-giving word component of radio in terms kept such as broadcast, portable radio, sound broadcasting etc. as well as in the company name Telefunken until today.
A new development of the radio engineering became possible by extremely energy-saving miniaturization: sound-powered radio engineering for application in switches and sensors. Also with the cross-linking of different devices, like z. B. within the framework (ZigBee) - alliance, is already used the sound-powered radio engineering. The energy necessary for the transmission process is won thereby from the environment (depressing the key, temperature difference, light, vibrations…).
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