Mount Lemmon Air Force Station
Mount Lemmon Air Force Station
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| Part of Air Defense Command (ADC) | |
 Mount Lemmon AFS
Location of Mount Lemmon AFS, Arizona
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| Coordinates | 32°26′30″N 110°47′22″W / 32.44167°N 110.78944°WCoordinates: 32°26′30″N 110°47′22″W / 32.44167°N 110.78944°W |
| Type | Air Force Station |
| Site information | |
| Controlled by |
 United States Air Force
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| Site history | |
| Built | 1956 |
| In use | 1956-1969 |
| Garrison information | |
| Garrison | 684th Aircraft Control and Warning Squadron |
Mount Lemmon Air Force Station (ADC ID: M-92, NORAD ID: Z-92) is a closed United States Air Force General Surveillance Radar station. It is located 17.2 miles (27.7 km) north-northeast of Tucson, Arizona. It was closed in 1969.
Mount Lemmon Air Force Station was established in 1954 by Air Defense Command as one of a planned deployment of forty-four mobile radar stations to support the permanent ADC Radar network in the United States sited around the perimeter of the country. This deployment was projected to be operational by mid-1952. Funding, constant site changes, construction, and equipment delivery delayed deployment.
This site became operational on 1 April 1956 when the 684th Aircraft Control and Warning Squadron was assigned by the 34th Air Division to Mount Lemmon AFS. The squadron began operations using AN/MPS-7, AN/MPS-14, and AN/TPS-10D radars at Mount Lemmon in August 1956, and initially the station functioned as an aircraft control and warning station. The AN/TPS-l0D was soon retired. By 1959 an AN/FPS-20 had replaced the AN/MPS-7 search radar.
The Ground Air Transmitting Receiving (GATR) Site (R-92) for communications was located at 32°26′23″N 110°47′11″W / 32.43972°N 110.78639°W, Normally the GATR site was connected by a pair of buried telephone cables, with a backup connection of dual telephone cables overhead. The Coordinate Data Transmitting Set (CDTS) (AN/FST-2) at the main site converted each radar return into a digital word which was transmitted by the GATR via microwave to the Control Center.
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