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Top left, stereo headphones with a cassette player built into one side. Top right, a portable cassette player and audio recorder with radio for use with headphones. Below, a miniature dictation machine mainly for business dictations, use by journalists, etc. The latter is far more widely used than the other two types, which were rather rare.
Naval air traffic controller communicates with aircraft over a two-way radio headset A variety of portable handheld two-way radios for private use. A two-way radio is a radio transceiver (a radio that can both transmit and receive radio waves), which is used for bidirectional person-to-person voice communication with other users with similar radios, [1] in contrast to a broadcast receiver ...
Whereas most portable electronics are powered by a 1.8, 2.5 or 3.3 Vpp supply, many headphone amplifiers use 10, 18 or 24 Vpp supplies, allowing 5-20 dB higher volume. [1] If a pair of headphones is too quiet, adding an amplifier that can output higher voltage/power will increase its volume.
The first boombox was developed by the inventor of the audio compact cassette, Philips of the Netherlands.Their first 'Radiorecorder' was released in 1966. The Philips innovation was the first time that radio broadcasts could be recorded onto cassette tapes without the cables or microphones that previous stand-alone cassette tape recorders required.
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.
The radio receives 3 MHz to 27 MHz AM shortwave in three bands, 26.965 MHz through 27.405 MHz HF CB in one band, 540 kHz to 1620 kHz standard AM broadcast in one band, and 87 MHz to 108 MHz monaural standard broadcast FM. The DX-60 existed in two versions, model 12-764 and a nearly identical but production-cost-reduced 12-764A.
The "SoundDock Portable" was released in 2007 [23] and included a battery which provided a running time of 3 to 14 hours, depending on bass and listening volume. [ 24 ] [ 25 ] Compared to the SoundDock series I, the Portable was had an external 3.5 input and the remote control could change between playlists.
The reflex receiver, invented in 1914 by Wilhelm Schloemilch and Otto von Bronk, [136] and rediscovered and extended to multiple tubes in 1917 by Marius Latour [136] [137] and William H. Priess, was a design used in some inexpensive radios of the 1920s [138] which enjoyed a resurgence in small portable tube radios of the 1930s [139] and again ...
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