KNIFE EDGE DIFFRACTION

CD 2055064 E&MP7.002

Communications

March 21, 1962

Computer communications engineer shows typical path of microwave signals that are diffracted by mountain ridge to over-the-horizon destinations.

IBM is using this “knife-edge diffraction” technique to transmit computer data between Monterey and San Jose.

The low-power requirement of the link results in smaller transmission and receiving equipment such as the 10-foot diameter receiver shown behind the engineer at IBM’s San Jose Advanced Systems Development Division Laboratory. 

Original Caption by Science Service
^©IBM