Letter | Published:

Measurement of Radio Sources at Centimetre Wave-lengths

Naturevolume 199page1177 (1963) | Download Citation



IN future, the limit of detection of faint radio sources, at wave-lengths of 10 cm and less, is likely to be set by the radiation from water vapour and rain in the troposphere1,2. The dominant factor is the minute-to-minute fluctuations in received power, which may be as much as 2° K at λ 3.7 cm. These fluctuations are greatly in excess of the receiver noise fluctuations, and may destroy all the benefit of using a modern low-noise amplifier such as a maser.

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  1. 1

    Orhaug, T., Pub. N.R.A.O., Greenbank, U.S.A., 1, No. 14 (Oct. 1962).

  2. 2

    Hogg, D. C., and Semplak, R. A., Bell Syst. Tech. J., 40, 1331 (1961).

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  1. Jodrell Bank, Macclesfield, Cheshire

    • R. G. CONWAY


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