[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 21: Microwave and Millimeter Wave Applications in the 1970s and 1980s

[Cassegrain antenna with motor-driven subreflector]

Cassegrain antenna with motor-driven subreflector. In normal operation the received signal is reflected from the plate into the main refletor of the Cassegrain and from there, via the subreflector, the beam passed through the circular hole in the center of the main reflector, and then through the antenna cylindrical support structure, and finally into the top of the GOMUX. Credit: Photo courtesy of Doc Ewen.

Slide 22
Modified on Wednesday, 02-Feb-2005 11:43:18 EST by Ellen Bouton