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Today, every smartphone also serves as a portable media player; however, prior to the rise of smartphones in the 2007–2012 time frame, a variety of handheld players were available to store and play music. The immediate predecessor to the portable media player was the portable CD player and prior to that, the personal stereo.
Ultra-wideband (UWB, ultra wideband, ultra-wide band and ultraband) is a radio technology that can use a very low energy level for short-range, high-bandwidth communications over a large portion of the radio spectrum. The following is a list of devices that support the technology from various UWB silicon providers.
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.
The following video is part of our "Motley Fool Conversations" series, in which consumer goods editor and analyst Austin Smith and technology and media editor and analyst Andrew Tonner discuss ...
Pocket FM transmitter. Pocket FM is a small, low-powered radio transmitter designed for use in areas with tightly controlled or undeveloped communications infrastructure. The devices are portable and have the appearance of a receiver rather than a transmitter, making them more practical for citizen use and harder for authorities to detect when used subversively in pirate radio networks.
Pocket Rockers was a brand of personal stereo produced by Fisher-Price in the late 1980s, aimed at elementary school-age children. [1] They played a proprietary variety of miniature cassette (appearing to be a smaller version of the 8-track tape ) which was released only by Fisher-Price themselves.
A classic Emerson transistor radio, circa 1958. A transistor radio is a small portable radio receiver that uses transistor-based circuitry.Previous portable radios used vacuum tubes, which were bulky, fragile, had a limited lifetime, consumed excessive power and required large heavy batteries.
Ultra high frequency (UHF) is the ITU designation [1] [2] for radio frequencies in the range between 300 megahertz (MHz) and 3 gigahertz (GHz), also known as the decimetre band as the wavelengths range from one meter to one tenth of a meter (one decimeter).
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