Minimum Noise Levels Obtained on Short-Wave Radio Receiving Systems

  title={Minimum Noise Levels Obtained on Short-Wave Radio Receiving Systems},
  author={KARL G. Jansky},
  journal={Proceedings of the Institute of Radio Engineers},
  • K. Jansky
  • Published 1 December 1937
  • Physics
  • Proceedings of the Institute of Radio Engineers
The theoretical minimum noise level of receivers in the absence of any interference, the source of which is external to the receiver, is discussed and compared with the limit actually measured on various antennas over a limited frequency range in the short-wave spectrum. It is pointed out that, on the shorter wave lengths and in the absence of man-made interference, the usable signal strength is generally limited by noise of interstellar origin. The powers obtained from this noise with the… Expand
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