Osceola Air Force Station
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Osceola Air Force Station (1951-1975) - A Cold War U.S. Air Force Radar Station. Located near East Farmington, Polk County, Wisconsin. Named Osceola Air Force Station on 1 Dec 1953. Initially assigned a Permanent ID of P-35 and later a Sage ID of Z-35. Deactivated on 31 Mar 1975. HistoryEstablished in 1950 and became operational on 1 Jan 1951 as East Farmington radar site and renamed Osceola Air Force Station 1 Dec 1953. Manned by the 674th AC&W Squadron whose name was changed on 15 Dec 1959 to the 674th Radar Squadron (SAGE) and again on 1 Feb 1974 to the 674th Radar Squadron. Initial equipment included two CPS-6B radars. The CPS-6B radars were replaced by one FPS-7 search radar and two FPS-6A height finder radars in 1959. This configuration met the requirements for the transition to the SAGE System operation. SAGE System TransitionThe transition of the manual GCI system to the automated SAGE system began with the installation of the FST-2 coordinate data transmitter and search radar upgrades. The FST-2 equipment digitized the radar returns and transmitted the digital returns to the SAGE direction center. Under the SAGE System, interceptor aircraft were directed to their targets by the direction center computers and controllers, greatly reducing the need for local controllers and equipment at every radar station. The FST-2 was a very large digital system using vacuum tube technology. Over 6900 vacuum tubes were used in each FST-2 requiring 21 air-conditioned cabinets, 40 tons of air conditioning, 43.5 kva of prime power, and usually a large new addition to the operations building. The FST-2B modification added two more cabinets but with newer solid-state (transistor) technology to process coded responses from aircraft transponders. SAGE System Operation
The site began operation as a SAGE site on 1 Jul 1959 initially feeding the Duluth SAGE Direction Center DC-10. In 1963 the two FPS-6A height finders were upgraded to become two FPS-90 height finders. In the early 1970s the vacumn tube FST-2B was replaced with a solid state FYQ-47 Common Digitizer. ClosureOsceola AFS and the 674th were deactivated on 31 Mar 1975. Gap FillersOsceola AFS was responsible for the maintenance of three remote unattended gap filler radar sites. The unattended gap filler sites were placed in locations where the main search radar lacked coverage. These sites were equipped with short range FPS-14 or FPS-18 search radars and FST-1 Coordinate Data transmitters that sent digitized radar target data to a SAGE direction center and to the main radar site. Both the radar set and the FST-1 were dual channel to increase site up time. Maintenance teams were dispatched for regularly scheduled maintenance or when fault indicators on the FSW-1 remote monitoring equipment suggested the site had problems. The FSW-1 also allowed remote operation of specific functions such as channel changes for the radar and for the FST-1, it also allowed remote operation of the diesel generators at the gap filler site. The Osceola AFS gap filler radars were located at ..... and ......
Note: Reported dates overlap and may be incorrect or reflect periods of intermittant temporary command. Current StatusNow part of the Association Retreat Center - The ARC.
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