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2. Radio receiver - Wikipedia

   en.wikipedia.org/wiki/Radio_receiver

   A modern smartphone has several RF CMOS digital radio transmitters and receivers to connect to different devices, including a cellular receiver, wireless modem, Bluetooth modem, and GPS receiver. [145] The development of integrated circuit (IC) chips in the 1970s created another revolution, allowing an entire radio receiver to be put on an IC ...

3. Wireless telegraphy - Wikipedia

   en.wikipedia.org/wiki/Wireless_telegraphy

   At the receiver the pulses are audible in the receiver's speaker as beeps, which are translated back to text by an operator who knows Morse code. Radiotelegraphy was the first means of radio communication. The first practical radio transmitters and receivers invented in 1894–1895 by Guglielmo Marconi used radiotelegraphy. [5]

4. List of Marconi wireless stations - Wikipedia

   en.wikipedia.org/wiki/List_of_Marconi_wireless...

   The feedlines feeding radio power from the transmitter to the huge flattop wire antenna are visible, top. A list of early wireless telegraphy radio stations of the Marconi Wireless Telegraph Co. Guglielmo Marconi developed the first practical radio transmitters and receivers between 1895 and 1901.

5. Wireless power transfer - Wikipedia

   en.wikipedia.org/wiki/Wireless_power_transfer

   Generic block diagram of a wireless power system. Wireless power transfer (WPT; also wireless energy transmission or WET) is the transmission of electrical energy without wires as a physical link. In a wireless power transmission system, an electrically powered transmitter device generates a time-varying electromagnetic field that transmits ...

6. Transmitter - Wikipedia

   en.wikipedia.org/wiki/Transmitter

   A laptop computer and home wireless router (background) which connects it to the Internet, creating a home Wi-Fi network. Both have Wi-Fi modems, automated microwave transmitters and receivers operating on 2.4 GHz which exchange data packets with the internet service provider (ISP). A Bluetooth earbud with microphone.

7. Coherer - Wikipedia

   en.wikipedia.org/wiki/Coherer

   The circuit of a coherer receiver, that recorded the received code on a Morse paper tape recorder. Unlike modern AM radio stations that transmit a continuous radio frequency, whose amplitude (power) is modulated by an audio signal, the first radio transmitters transmitted information by wireless telegraphy (radiotelegraphy), the transmitter was turned on and off (on-off keying) to produce ...