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

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

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