Extra-terrestrial radio noise as a source of interference in the frequency range 30ߝ1000 Mc/s

Published information on the intensity of noise from the galaxy, the sun and from other extra-terrestrial sources is presented in a form which shows their importance relative to the internal noise of typical receiving installations. Particular attention is paid to a half-wave horizontal dipole aerial and to an aerial with a 20° pencil beam directed horizontally.