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  2. 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 ...

  3. Kenwood Corporation - Wikipedia

    en.wikipedia.org/wiki/Kenwood_Corporation

    Kenwood manufactures audio equipment such as AM/FM stereo receivers, cassette tape decks/recorders, amateur radio (ham radio) equipment, radios, cellular phones, speakers and other consumer electronics. TRIO TS-520S, HF transceiver, manufactured in the 1970s and 1980s by the Trio-Kenwood Corporation

  4. Headphones - Wikipedia

    en.wikipedia.org/wiki/Headphones

    Headphones connect to a signal source such as an audio amplifier, radio, CD player, portable media player, mobile phone, video game console, or electronic musical instrument, either directly using a cord, or using wireless technology such as Bluetooth, DECT or FM radio. The first headphones were developed in the late 19th century for use by ...

  5. Crystal radio - Wikipedia

    en.wikipedia.org/wiki/Crystal_radio

    1600 ohm magnetic headset. The early earphones used with wireless-era crystal sets had moving iron drivers that worked in a way similar to the horn loudspeakers of the period. Each earpiece contained a permanent magnet about which was a coil of wire which formed a second electromagnet. Both magnetic poles were close to a steel diaphragm of the ...

  6. Wireless - Wikipedia

    en.wikipedia.org/wiki/Wireless

    Wireless communication (or just wireless, when the context allows) is the transfer of information (telecommunication) between two or more points without the use of an electrical conductor, optical fiber or other continuous guided medium for the transfer. The most common wireless technologies use radio waves.

  7. Radio receiver - Wikipedia

    en.wikipedia.org/wiki/Radio_receiver

    AM broadcast band radio waves travel as ground waves which follow the contour of the Earth, so AM radio stations can be reliably received at hundreds of miles distance. Due to their higher frequency, FM band radio signals cannot travel far beyond the visual horizon; limiting reception distance to about 40 miles (64 km), and can be blocked by ...