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 Tropospheric Scatter Communication
"Troposcatter"
 C OMPUTERS Page
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Computer Page Appendix
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Just as you see oncoming cars on a foggy night, Troposcatter uses the Troposphere.
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Legacies of the Cold War

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Tropospheric Scatter Principles,
Combination of Refraction and Reflection
The White Alice Communications System (WACS), was
over 50 troposcatter communications sites in Alaska.
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DEW Line RADAR Site
Located above the Arctic Circle at Point Lay, AK (population 247). Comm. link is by a White Alice Communications System (WACS), troposcatter installation. (left) This site is designated a Long Range Radar Station (LRRS). link
Parabolic, billboard like, Reflectors
The troposcatter system operated around 900 MHz, and utilized both space and frequency diversity. It used pairs of 60 ft (18 m) or 120 ft (37 m) parabolic, billboard like reflectors.
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Hardened Troposcatter Communication Sites in VA & NC

Pilfered from  http://coldwar-c4i.net/

[VA-1] is one of five "Project Offices" built by AT&T in the 1960s in the mid-Atlantic region. The station is hardened against nuclear blasts, and features an earth-covered underground building with a "drive-through" entrance-decontamination area, a high-powered troposcatter radio communication s system with large concrete-backed reflectors, a helipad, blast-resistant terrestrial microwave "dish" antennas, and physical-security measures beyond those used at conventional AT&T facilities.

Detailed information about [VA-1]'s function has never been revealed. The facility housed a switching system for the Department of Defense's AUTOVON telephone network, but that was probably not the station's primary mission. It's likely that [VA-1] supported a highly-classified Continuity of Goverment program and may have served as an emergency relocation site for senior executive-branch officials and/or military leadership.

[VA-1] is still an active, secure AT&T facility, and unofficial visitors are not permitted.

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Troposcatter relay site at Buckingham County, VA
Tropo reflectors are hardened concrete with infrastructure several stories underground. Gamma ray detectors are mounted to outside structures. Greater Detail
Troposcatter relay site designated, LSBG [VA-05]
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 C OMPUTERS Page
 Computer Page Appendix
AT&T's hardened Troposcatter Communication site off Chatham County, NC's 'Big Hole Road'
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The site is equidistant between Chapel Hill and Pittsboro
Big Hole Road site from space
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Big Hole Road site from space, Zoomed
AT&T's "Big Hole" Communication Center in Chatham County
Newspaper Article
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Hardened Concrete Structures, dual Parabolic Reflectors with accompanying feed horn Sub-structures 
The Parabolic Reflectors are fed R.F. from hardened concrete feed horn structures that are low profile to the ground and fed from hardened underground bunkers several stories down that house the communication equipment as well as life support and crew quarters.
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Another example of a hardened Troposcatter Antenna
(The appendage at the top is a Gamma Ray Detector)
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 C OMPUTERS Page
 Computer Page Appendix
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