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2. History of radio - Wikipedia

   en.wikipedia.org/wiki/History_of_radio

   History of radio. The early history of radio is the history of technology that produces and uses radio instruments that use radio waves. Within the timeline of radio, many people contributed theory and inventions in what became radio. Radio development began as "wireless telegraphy". Later radio history increasingly involves matters of ...

3. Weltron - Wikipedia

   en.wikipedia.org/wiki/Weltron

   2010 – a portable AM/FM audio receiver with 8-track player/recorder (c. 1977) XX-10 – a portable AM/FM audio receiver with compact cassette recorder; 37-009 – AM radio headphones; 37-001w – headphones; 37-002 – headphones; Model 2007 was demonstrated at the 1975 Winter Consumer Electronics Show, with a price of $399 (equivalent to ...

4. FM broadcasting - Wikipedia

   en.wikipedia.org/wiki/FM_broadcasting

   It belongs to FM radio station KWNR, in Henderson, Nevada, and broadcasts at 95.5 MHz. FM broadcasting is a method of radio broadcasting that uses frequency modulation ( FM) of the radio broadcast carrier wave. Invented in 1933 by American engineer Edwin Armstrong, wide-band FM is used worldwide to transmit high-fidelity sound over broadcast radio.

5. Crystal radio - Wikipedia

   en.wikipedia.org/wiki/Crystal_radio

   Crystal radio. Swedish crystal radio from 1922 made by Radiola, with earphones. The device at top is the radio's cat's whisker detector. A second pair of earphone jacks is provided. 1970s-era Arrow crystal radio marketed to children.

6. AM broadcasting - Wikipedia

   en.wikipedia.org/wiki/AM_broadcasting

   AM broadcasting. AM broadcasting is radio broadcasting using amplitude modulation (AM) transmissions. It was the first method developed for making audio radio transmissions, and is still used worldwide, primarily for medium wave (also known as "AM band") transmissions, but also on the longwave and shortwave radio bands.

7. High fidelity - Wikipedia

   en.wikipedia.org/wiki/High_fidelity

   High fidelity (often shortened to Hi-Fi or HiFi) is the high-quality reproduction of sound. [ 1] It is popular with audiophiles and home audio enthusiasts. Ideally, high-fidelity equipment has inaudible noise and distortion, and a flat (neutral, uncolored) frequency response within the human hearing range. [ 2]