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Handbook of Frequency Allocations and Spectrum Protection for Scientific Uses (2007) / Chapter Skim
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Appendix H Use of 0 dBi for Sidelobe Gain in Calculations of Interference in Radio Astronomy Bands
Pages 114-115

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From page 114...
... . As stated in Report 224: "To estimate typical values of the harmful interference level, we may approximate our real antenna by an isotropic antenna, except in the direction of the main lobe and near side lobes." The isotropic model represents the average gain of any low-loss antenna, independent of the details of its design.
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From page 115...
... Thus, if it is assumed that the angles of pointing of the radio astronomy antenna are uniformly distributed over the sky (which is only approximately the case) and that one interfering transmitter is active, the values in column 3 provide an estimate of the fraction of time that the interference received exceeds the detrimental level.2 For the more recent sidelobe models in the table these values are ~3 percent, and to reduce this result to 2 percent (the maximum tolerable value, as noted above)
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Key Terms

  • harmful interference
  • radio astronomy


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