[Doc Ewen looks into the horn antenna, 1950]
Image courtesy of Doc Ewen


Harvard Cyclotron: 1948-1951

Detection of HI Line: 1951

Harvard 24ft and 60ft and NRAO founding: 1952-1956

1950s and 1960s: Two Roads that Crossed

Microwave & Millimeter Wave Applications in the 1970s and 1980s

Mm Wave Radiometry in the 1990s

May 2001 visit to NRAO Green Bank



[Doc Ewen and horn antenna, 2001]
Image courtesy of Doc Ewen

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

by Doc Ewen, © 2003

Slide 26: Two Roads that Crossed in the Wood - Growth of US Radio Astronomy in the 1950s and 1960s

[Modified Polaris radiometric receiver]

.The modified Polaris radiometric receiver uses reconfigured noise balance circuit, and is the first commercially available radiometer. It was purchased by National Radio Astronomy Observatory for use in Green Bank, West Virginia. Credit: Photo courtesy of Doc Ewen.

Slide 27
Modified on [an error occurred while processing this directive] by Ellen Bouton