A Survey of the Background Radiation at a Frequency of 404 Mc/s

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Abstract
This paper describes measurements of the brightness temperature of the sky as measured at 404 Mc/s with a beam of width 7°.5 between half-power points. The region surveyed lies between declinations −20° to +90°. The observed noise powers have been compared with those available from resistances at different temperatures and particular attention has been paid to corrections for radiation received in side-lobes of the beam from the ground and other parts of the sky. The average error in the brightness temperature differences between any two points observed is believed to be ±0.8 °K and the error in the absolute temperature at an average point is about ±2.2 °K.

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