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Interference from extraneous radio stations
This category is due to interference with the radio work on almost all ranges of a large number of powerful and heavy duty stations. There are several types of interference by foreign radio stations. However, before we consider their nature, should remind some facts about the nonlinear elements of the radio.
By the nonlinear elements are known to include such electrical system or circuit, whose parameters depend on the voltages and currents in them. In a big city, they are determined mainly by industrial noise, in rural areas - atmospheric, and the level of these spurious oscillations, as we have seen, can vary within very wide limits, but with the presence of a certain level of interference must always be considered, as with an incontrovertible fact. For the implementation of the normal radio needed to signal to some extent exceeded the noise level, otherwise satisfactorily identify the noise background signal will not succeed. Necessary ratio of the signal to noise level, providing a normal signal reception depends on the type of transmission. Signals that are below the noise level cannot reproduce, no matter what the gain can provide the receiver. Therefore, increasing the number of steps to strengthen the receiver in this case is a useless exercise, and a real sensitivity of the detectors should be improved by other means. Extremely effective way to reduce industrial noise, especially in cities, is ways to deal with noise at the source of their origin. Good results in terms of a sharp reduction of industrial noise in the space allow the screening of the source of interference. Very important is the thoroughness of screening. The use of screening can be achieved very effective protection from industrial noise directly radiated source.