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Abstract
Measurement of atmospheric noise in the frequency range 2·5–9·5 mc./s. has been in progress at the Research Department of All India Radio, New Delhi, since November 1955. The measured data have been compared with the predicted ones for Delhi from C.C.I.R. Report No. 65. It is observed that the predicted values are invariably low and the difference between the two has, at times, exceeded 40 db. It is concluded that the noise grades predicted in the C.C.I.R. report do not represent conditions prevailing in India and there are sufficient justifications to warrant their revision.