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A radio transmitter or just transmitter is an electronic device which produces radio waves with an antenna. Radio waves are electromagnetic waves with frequencies between about 30 Hz and 300 GHz. The transmitter itself generates a radio frequency alternating current, which is applied to the antenna. When excited by this alternating current, the antenna radiates radio waves. Transmitters are necessary parts of all systems that use radio: radio and television broadcasting, cell phones, wireless networks, radar, two way radios like walkie talkies, radio navigation systems like GPS, remote entry systems, among numerous other uses.
A transmitter can be a separate piece of equipment, or an electronic circuit within another device. Most transmitters consist of an electronic oscillator which generates an oscillating carrier wave, a modulator which impresses an information bearing modulation signal on the carrier, and an amplifier which increases the power of the signal. To prevent interference between different users of the radio spectrum, transmitters are strictly regulated by national radio laws, and are restricted to certain frequencies and power levels, depending on use. The design must usually be type approved before sale. An important legal requirement is that the circuit does not radiate significant radio wave power outside its assigned frequency band, called spurious emission.
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A radiotransmitter or just transmitter is an electronic device which produces radio waves with an antenna. Radio waves are electromagnetic waves with...
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radio broadcasting transmitter which transmits audio (sound) to broadcast radio receivers (radios) owned by the public, or a television transmitter,...
Telecommunication Television receive-only Radio transmitterdesignRadio receiver designRadio-Electronics, Radio Receiver Technology Pizzi, Skip; Jones, Graham...
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device called a transmitter connected to an antenna which radiates the waves. They are received by another antenna connected to a radio receiver. In addition...
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magnetic compass and radio direction finding apparatus to navigate through diverse wooded terrain while searching for radiotransmitters. The rules of the...
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design owing to the difficulty of designing radio circuitry. Good electronic radiodesign is notoriously complex because of the sensitivity of radio circuits...
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oldest continuously operating radio transmitting installation in the world. Germany's first high power radiotransmitter, it was founded on 1 April 1906...
attaches a transmitter to an animal that gives off unique electromagnetic radio signals, which allows the animal to be located. Transmitters are available...
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