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2. Radio-frequency engineering - Wikipedia

   en.wikipedia.org/wiki/Radio-frequency_engineering

   Radio-frequency (RF) engineering is a subset of electrical engineering involving the application of transmission line, waveguide, antenna, radar, and electromagnetic field principles to the design and application of devices that produce or use signals within the radio band, the frequency range of about 20 kHz up to 300 GHz.

3. List of radios - Wikipedia

   en.wikipedia.org/wiki/List_of_radios

   The RCA model R7 Superette superheterodyne table radio. This is a list of notable radios, which encompasses specific models and brands of radio transmitters, receivers and transceivers, both actively manufactured and defunct, including receivers, two-way radios, citizens band radios, shortwave radios, ham radios, scanners, weather radios and airband and marine VHF radios.

4. Radio frequency - Wikipedia

   en.wikipedia.org/wiki/Radio_frequency

   Radio frequencies are also applied in carrier current systems including telephony and control circuits. The MOS integrated circuit is the technology behind the current proliferation of radio frequency wireless telecommunications devices such as cellphones .

5. Superconducting radio frequency - Wikipedia

   en.wikipedia.org/wiki/Superconducting_radio...

   The Geometry Factor is also independent of cavity size, it is constant as a cavity shape is scaled to change its frequency. As an example of the above parameters, a typical 9-cell SRF cavity for the International Linear Collider [ 5 ] (a.k.a. a TESLA cavity) would have G =270 Ω and R s = 10 nΩ, giving Q o =2.7×10 10 .

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7. Shortwave radio receiver - Wikipedia

   en.wikipedia.org/wiki/Shortwave_radio_receiver

   Modern portable shortwave radio receiver with digital frequency display and keypad for direct frequency entry. A shortwave radio receiver is a radio receiver that can receive one or more shortwave bands, between 1.6 and 30 MHz. A shortwave radio receiver often receives other broadcast bands, such as FM radio, Longwave and Mediumwave.

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9. Antenna (radio) - Wikipedia

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

   [1] [2] It is the interface between radio waves propagating through space and electric currents moving in metal conductors, used with a transmitter or receiver. [1] In transmission, a radio transmitter supplies an electric current to the antenna's terminals, and the antenna radiates the energy from the current as electromagnetic waves (radio ...