Noise, Receiver

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Noise, Receiver


the electrical fluctuations that occur mainly in the input circuits (for example, amplifiers and filters) of radio-receiving apparatus (seeFLUCTUATIONS, ELECTRICAL).

When combined with noises from external sources, such as atmospheric noise, terrestrial noise, and cosmic noise, a total noise is produced that acts as a natural threshold of the sensitivity of the radio receiver. The quantitative characteristic of receiver-noise intensity is its noise temperature. For example, until the 1950’s, the input devices used in superhigh-frequency radio receivers had noise temperatures of more than 2000°K, which was many times higher than the noise temperatures of the external sources. Subsequently, low-noise, superhigh-frequency amplifying devices were invented, such as tunnel diodes, parametric amplifiers, and quantum mechanical amplifiers, which made it possible to lower the receiver-noise temperatures, respectively, to values of the order of 300°, 30°, and 3 K, thereby improving the sensitivity of superhigh-frequency radio receivers by about 10 to 50 times.


Ainbinder, 1. M. Shumy radiopriemnikov. Moscow, 1974.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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