Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981s%26t....61..308p&link_type=abstract
Sky and Telescope, vol. 61, Apr. 1981, p. 308-310.
Astronomy and Astrophysics
Astronomy
Atmospheric Windows, Frequency Assignment, Radio Astronomy, Radio Frequency Interference, Continuous Spectra, Electromagnetic Spectra, Radio Transmitters, Sidelobes
Scientific paper
The threat to radio astronomy research from man-made interference is discussed. Interference can affect astronomical observations in several ways: (1) an interfering device may generate the same principal frequency as the band being studied; (2) the interference may result from the spurious radiation of a device; (3) the telescope may pick up an interfering signal in one of its side lobes even if it is not pointing in the direction of the signal; (4) the omission of band-limiting filters on the telescope in order to minimize signal loss lets interfering signals through. Few bands have been set aside by regulatory commissions for radio astronomy use: none at all below 20 GHz; 105 to 11 GHz and 217 to 231 GHz for passive use only; 322 to 328.6 MHz and 42.5 to 43.5 GHz for primary use. The most serious threat is posed by airborne and satellite transmitters. Recommendations are made to protect radio windows for astronomy without unreasonable restrictions on active spectrum users.
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