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| But subject to interference, not only directly but also through the wires connected to a source of interference. In order to prevent penetration of noise in the wires used to input and output noise source bypass capacitors or smoothing filters. In addition to jamming on the quality and stability of the radio is substantially affected by the so-called passive interference. Passive interference caused by some natural phenomena that violate the normal propagation of radio waves from the transmitting station to the place of reception. Consider briefly the main types of passive interference, their nature and the measures that are used to combat them. Propagation of radio waves associated with regular changes of the field in place of the reception, depending on time of day, time of year. These changes are usually taken into account when designing radio links, choice of power and wavelength, receiver sensitivity, etc. However, in addition to these regular changes are observed more and faster, deep irregular variation of the force fields, which are known as fading. The phenomenon of fading at admission shows that the power of sound, despite continuing configure the receiver begins to decrease gradually (up to complete disappearance of sound), then increases again, reaching the initial value. Such changes in sound intensity can very often follow each other. The duration of one fading varies - it can last from a fraction of a second to several minutes. With wireless telegraphy fading phenomenon causes a loss of marks for admission. The reason for the fading is that the reception desk of the radio waves from the transmitter of the fall in various ways. Some waves travel directly along the earth's surface, this group of waves called terrestrial or shallow beam. Other waves get to the point of reception on a curved path due to reflection from the upper atmosphere, ionosphere. These waves form the so-called heaven or spatial beam. |
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