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  2. Crystal radio - Wikipedia

    en.wikipedia.org/wiki/Crystal_radio

    A family listening to a crystal radio in the 1920s Greenleaf Whittier Pickard's US Patent 836,531 "Means for receiving intelligence communicated by electric waves" diagram US Bureau of Standards 1922 Circular 120 "A simple homemade radio receiving outfit" taught Americans how to build a crystal radio.

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  4. Personal radio service - Wikipedia

    en.wikipedia.org/wiki/Personal_radio_service

    In addition to license-free PMR446, CB and SRD/LPD433 radio, Germany has a VHF-FM allocation called Freenet that allows a maximum of 1 W of power on six channels in the 149 MHz band. 149.0250 MHz; 149.0375 MHz; 149.0500 MHz; 149.0875 MHz; 149.1000 MHz; 149.1125 MHz; The Freenet allocation is a re-purposing of the old B-Netz mobile telephone ...

  5. Batteryless radio - Wikipedia

    en.wikipedia.org/wiki/Batteryless_radio

    Crystal radio receivers are a very simple kind of batteryless radio receiver. They do not need a battery or power source, except for the power that they receive from radio waves using their long outdoor wire antenna. Sharp Electronics' first electrical product was a batteryless crystal radio introduced in 1925.

  6. Detector (radio) - Wikipedia

    en.wikipedia.org/wiki/Detector_(radio)

    A simple crystal radio with no tuned circuit can be used to listen to strong AM broadcast signals. An early form of envelope detector was the crystal detector, which was used in the crystal set radio receiver. A later version using a crystal diode is still used in crystal radio sets today.

  7. Radio - Wikipedia

    en.wikipedia.org/wiki/Radio

    Radio is the technology of communicating using radio waves. [1] [2] [3] Radio waves are electromagnetic waves of frequency between 3 hertz (Hz) and 300 gigahertz (GHz). They are generated by an electronic device called a transmitter connected to an antenna which radiates oscillating electrical energy, often characterized as a wave.

  8. PMR446 - Wikipedia

    en.wikipedia.org/wiki/PMR446

    Motorola TA288 PMR446 licence-free radio Motorola TLKR T40 radio tuned to PMR channel 1. PMR446 (Private Mobile Radio, 446 MHz) is a licence-exempt service or UHF CB in the UHF radio frequency band, as personal radio service or citizens band radio, and is available for business and personal use in most countries throughout the European Union, [1] Malaysia, [2] Singapore, [3] and Norway.

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