Wildcat Ridge WWII Radar Site
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Wildcat Ridge WWII Radar Site (1942-1946) - A World War II U.S. Army Radar Site established in 1942. Used to provide fire control information to large caliber (6" and above) coastal gun batteries in the Harbor Defense of the San Francisco against enemy warships. Located on Wildcat Ridge Military Reservation near Olema, Marin, California. Closed in 1946. HistoryPart of the Harbor Defense of San Francisco.
 Constructed under project No. RAD Rad-9-177 and transferred for use on 8 Jun 1944 as Wildcat Ridge WWII Radar Site. Construction costs to date of transfer were $13,248.17. The physical plant consisted of a transmitter building, two power houses each with a 1000 gallon fuel tank, a 25' steel tower and a antenna housing disguised as a Water tank atop the tower. The buildings and the tower were placed on concrete pads and footings installed by the Corps of Engineers who erected all of the structures. The engineering construction work was done by government forces. The radar equipment was installed by the Signal Corps. It required 16.3kW of 120/240 AC, 1 phase, 60 cycle power furnished by the two on-site 25kw generators. The 25 kW generators were furnished and installed by the Signal Corps.
Site Operation  In operation, the SCR-296A radar could only track one target at a time. Target assignments were made from the harbor HECP/HDCP command posts by telephone, citing the approximate range and azimuth of the target. The SCR-296A radar operators would then find the target and pass the precise range and azimuth to the plotting room at the gun battery by phone. Two operators were required, one for the range position and one for the azimuth position. The radar operators would continue to track the target and update the plotting room as the range and azimuth changed. The Radar track data was provided by telephone to support [[Battery 129] as the primary battery and to secondary batteries including Battery Townsley. ClosureThe SCR-296A Radar equipment was declared obsolete by AG letter on 17 Jan 1946. The Tower and radar equipment were to be disposed of while the buildings were to be retained. Physical Plant The transmitter building for this radar set was built as a dug-in type reinforced concrete structure with the antenna tower supported by four concrete piers on the reinforced concrete roof. The transmitter building site was then backfilled so that the roof was covered with a layer of earth and only the back entrance, the four antenna supports, a vent, an escape hatch and cable conduits were exposed. The radar site was located on the Wildcat Ridge Military Reservation which was the location of two fire control base end stations that provided part of a manual fire control system that relied on optical observation. The fire control stations supported Battery Townsley and Battery 129. Also on the post were 60" searchlights #1 and #2 of the San Francisco searchlight defenses. These were the furthest north searchlights of the harbor defenses. Adjacent to the transmitter site was a small 16 man barracks area and support facilities. Electrical power was provided by two 25kw generators each housed in a separate building with a 1000 gallon underground fuel tank. Communications facilities on the Wildcat Ridge Military Reservation included a 15 pair telephone cable southward to the Bolinas fire control switchboard and from there on to the Hill 640 Military Reservation fire control switchboard and then on a 25 pair cable to Fort Cronkhite and then on to the HDCP at Fort Scott. The landline communications were backed by an emergency radio network. Current StatusNo remains.
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