Image: US Army Signal Corps AN-TRC-1, 5, 6, & 8 microwave relay station 1945

Description: A US Army Signal Corps transportable microwave relay station from 1945 using AN/TRC-1, 5, 6, and 8 systems. Each pair of identical antennas is used for a link with another station up to 40 miles away, which can carry multiple telephone calls. Two antennas are required for bidirectional communication; one for transmitting and one for receiving. Microwave technology advanced during World War 2 due to the development of radar, and toward the end of the war the US Army began using microwave communication systems in the European theater. These military systems were some of the first practical microwave relay systems and presaged development of the great transcontinental commercial microwave relay networks in the 1950s. The systems shown here were: AN/TRC-1, 70-100 MHz FM system carries 4 telephone circuits AN/TRC-5, 230-250 MHz FM system carries 4 phone circuits AN/TRC-6, 4.3-4.9 GHz TDM system carries 8 phone circuits AN/TRC-8, 1.3-1.45 GHz TDM system carries 8 phone circuits Alterations to image: cloned out text graphics overlaying upper right corner of image.
Title: US Army Signal Corps AN-TRC-1, 5, 6, & 8 microwave relay station 1945
Credit: Retrieved November 2, 2015 from "Directional Radio Relays" in Popular Science magazine, The Popular Science Publishing Co., New York, Vol. 148, No. 1, January 1946, p. 188 on Google Books
Author: Credited to US Army Signal Corps
Usage Terms: Public domain
License: Public domain
Attribution Required?: No