Does Manuall Sometimes Make You Feel Stupid?
Radio Definition, History, & Facts Passive tags, the most common type, have a chip powered by the radio energy received from the reader, rectified by a diode, and can be as small as a grain of rice. They are incorporated in products, clothes, railroad cars, library books, airline baggage tags and are implanted under the skin in pets and livestock and even people. Privacy concerns have been addressed with tags that use encrypted signals and authenticate the reader before responding. Passive tags use 125–134 kHz, 13, 900 MHz and 2.4 and 5 GHz ISM bands and have a short range. Active tags, powered by a battery, are larger but can transmit a stronger signal, giving them a range of hundreds of meters. A few stations experimented with telephone lines to allow two or more outlets to carry (or “network”) an occasional presidential address or sporting event. Magazines, books, and even movies featured or included references to Radio broadcasting. Radio-controlled models – a popular hobby