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Basic knowledge of radio

2015-01-12 21:29:53

(1) produced by rapid change: when the current in a conductor, the conductor will be to its surrounding space launch electromagnetic wave.

(2) propagation: propagation of electromagnetic wave without medium, can travel through a vacuum, also can be in medium. Electromagnetic waves are called radio waves used in radio communication, is the frequency of electromagnetic wave in a certain range. (3) the relationship between the frequency, wavelength, wave velocity of electromagnetic wave propagation in a vacuum at the speed of light, the spread in the air velocity and the approximate in vacuum. The relationship between the frequency, wavelength, wave velocity between three to x frequency velocity = wavelength (or wave velocity = / cycle), represented by the letter v= lambda f (or v= lambda /t).

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