Thule Site J
| Thule Site J | |
| radar structures | |
 Thule AN/FPS-50 detection reflectors (1959–1987)--concrete foundations included a large refrigeration system to prevent the curing concrete's heat from melting Permafrost.
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| Landform | Greenland |
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| Part of |
1982:  Air Force Space Command (AFSPC)1979: |
| Location | 10 miles from Thule AB (13 road miles) |
| - coordinates |
76°34′13″N 68°17′56″W / 76.570258°N 68.298998°WCoordinates: 76°34′13″N 68°17′56″W / 76.570258°N 68.298998°W Early Warning Radar
76°34′04″N 68°17′03″W / 76.56785°N 68.284214°W AN/FPS-49A bldg |
| Completed (radars) |
1958-60 (AN/FPS-50) 1963 (AN/FPS-49A) 1987 (AN/FPS-120) |
| Images | |
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 site construction
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1961 Thule sketch, FPS-50 wave guides, & "memory and logic unit"
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1961 BMEWS Rearward communications "billboard type" antenna
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| Video | |
 Eyes of the North
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1979: 
Strategic Air Command (SAC)
1968: 
Aerospace Defense Command
1962: 
Air Defense Command
76°34′04″N 68°17′03″W / 76.56785°N 68.284214°W AN/FPS-49A bldg
Thule Site J (J-Site) is a United States Air Force (USAF) radar station in Greenland near Thule Air Base for missile warning and spacecraft tracking. The northernmost station of the Solid State Phased Array Radar System, the military installation was built as the 1st site of the RCA 474L Ballistic Missile Early Warning System and had 5 of 12 BMEWS radars. The station has the following structures:
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