Doc Ewen

Doc Ewen: The Horn, HI, and Other Events in US Radio Astronomy

by Doc Ewen, © 2003


Slide 24: Detecting the Interstellar Hydrogen Line, 1951

[Noise source for calibration of receiver]

Noise source for calibration of the 21cm receiver. [Photo courtesy of Doc Ewen]

Slide 25
Modified on by Ellen Bouton