689th Radar Squadron
Encyclopedia
The 689th Radar Squadron is an inactive United States Air Force
unit. It was last assigned to the 25th Air Division, stationed at Mount Hebo Air Force Station, Oregon. It was inactivated on 30 June 1979.
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Radar systems operated and maintained by the 689th included the FPS-24 search radar and the FPS-26A and FPS-90 height finder radar. The FPS-24 was housed in a 5 story tall (85 ft) building with two separate transmitters, a receiver, and special receiver equipment to provide counter measures against enemy jamming. In addition, the radar antenna was housed beneath a rigid radome about 145 ft in diameter and 100 ft tall. Three separate radomes were installed in the period from 1962 to 1965. All three were destroyed by high winds, the last in 1968. As a result the FPS-24 was removed and a FPS-27 search radar requiring a much smaller radome was installed. Both height finder radar antennas were protected by smaller, inflatable radomes. Each height finder radar was installed in its own building. The FPS-26A radar was later modified beginning in 1967 to an FSS-7 Sea Launched Ballastic Missile (SLBM) detector. All three radar buildings were connected together so that 689th personnel could walk between them and the Operations building and be protected from adverse weather conditions.
The 689th Radar Squadron was originally assigned to the SAGE Portland Air Defense Sector
(PoADS) at Adair Air Force Station
, Oregon, a part of the 25th Air Division SAGE at McChord AFB, Washington. Higher headquarters included 4th Air Force (Hamilton AFB, California), and Air Defense Command (Peterson AFB, Colorado). As the northernmost LRR site in PoADS, the 689th was also able to feed its radar data to the Seattle Air Defense Sector (SeADS), another adjacent unit of the 25th Air Division. When the PoADS and SeADS were absorbed into the 25th ADiv, the radars of the 689th and related units were connected to the computers there. In July 1967, Detachment 2 of the 14th Missile Warning Squadron was activated at Mt Hebo AFS to operate a missile warning radar. Both Squadrons are now deactivated. The Air Force equipment and facilities at Mt Hebo have been removed and the site returned to its natural state. A plaque is virtually all that remains of the radar station. It is dedicated In Memory Of Those Who Served At Mt. Hebo AFS, Oregon. 689th Radar Sq., Oct.1956-June 1979. Det.2 14th MWS July 1967 - Sep.1980.
Squadron responsibilities included operation and maintenance of the installed radar
and communications equipment, and various support activities including food service, supply, power production, civil engineering, administration, transportation, and personnel services. Available facilities included buildings for the radar and communications equipment, barracks for personnel, family housing, a power plant, dining hall, gym, motor pool, and administrative activities. The Squadron had all the functions and capabilities of a small town.
United States Air Force
The United States Air Force is the aerial warfare service branch of the United States Armed Forces and one of the American uniformed services. Initially part of the United States Army, the USAF was formed as a separate branch of the military on September 18, 1947 under the National Security Act of...
unit. It was last assigned to the 25th Air Division, stationed at Mount Hebo Air Force Station, Oregon. It was inactivated on 30 June 1979.
History
The 689th Radar Squadron's long range radars (LRRs) were part of the Air Force Semi-Automatic Ground Environment (SAGE) computer directed system for air defense. Available Squadron electronic equipment was able to support the detection, identification, and destruction of enemy aircraft. This was accomplished by communications between the SAGE computer at McChord AFB, the radars and communications systems at Mt. Hebo, and airborne fighter-interceptor aircraft such as the supersonic F-106 Delta DartF-106 Delta Dart
The Convair F-106 Delta Dart was the primary all-weather interceptor aircraft for the United States Air Force from the 1960s through the 1980s. Designed as the so-called "Ultimate Interceptor", it has proven to be the last dedicated interceptor in USAF service to date...
jet.
Radar systems operated and maintained by the 689th included the FPS-24 search radar and the FPS-26A and FPS-90 height finder radar. The FPS-24 was housed in a 5 story tall (85 ft) building with two separate transmitters, a receiver, and special receiver equipment to provide counter measures against enemy jamming. In addition, the radar antenna was housed beneath a rigid radome about 145 ft in diameter and 100 ft tall. Three separate radomes were installed in the period from 1962 to 1965. All three were destroyed by high winds, the last in 1968. As a result the FPS-24 was removed and a FPS-27 search radar requiring a much smaller radome was installed. Both height finder radar antennas were protected by smaller, inflatable radomes. Each height finder radar was installed in its own building. The FPS-26A radar was later modified beginning in 1967 to an FSS-7 Sea Launched Ballastic Missile (SLBM) detector. All three radar buildings were connected together so that 689th personnel could walk between them and the Operations building and be protected from adverse weather conditions.
The 689th Radar Squadron was originally assigned to the SAGE Portland Air Defense Sector
Portland Air Defense Sector
The Portland Air Defense Sector is an inactive United States Air Force organization. Its last assignment was with the 25th Air Division, being stationed at Adair Air Force Station, Oregon. It was inactivated on 1 April 1966.- History :...
(PoADS) at Adair Air Force Station
Adair Air Force Station
Adair Air Force Station is a closed United States Air Force station. It is located north-northeast of Corvallis, Oregon. It was closed in 1969.-History:...
, Oregon, a part of the 25th Air Division SAGE at McChord AFB, Washington. Higher headquarters included 4th Air Force (Hamilton AFB, California), and Air Defense Command (Peterson AFB, Colorado). As the northernmost LRR site in PoADS, the 689th was also able to feed its radar data to the Seattle Air Defense Sector (SeADS), another adjacent unit of the 25th Air Division. When the PoADS and SeADS were absorbed into the 25th ADiv, the radars of the 689th and related units were connected to the computers there. In July 1967, Detachment 2 of the 14th Missile Warning Squadron was activated at Mt Hebo AFS to operate a missile warning radar. Both Squadrons are now deactivated. The Air Force equipment and facilities at Mt Hebo have been removed and the site returned to its natural state. A plaque is virtually all that remains of the radar station. It is dedicated In Memory Of Those Who Served At Mt. Hebo AFS, Oregon. 689th Radar Sq., Oct.1956-June 1979. Det.2 14th MWS July 1967 - Sep.1980.
Squadron responsibilities included operation and maintenance of the installed radar
Radar
Radar is an object-detection system which uses radio waves to determine the range, altitude, direction, or speed of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain. The radar dish or antenna transmits pulses of radio...
and communications equipment, and various support activities including food service, supply, power production, civil engineering, administration, transportation, and personnel services. Available facilities included buildings for the radar and communications equipment, barracks for personnel, family housing, a power plant, dining hall, gym, motor pool, and administrative activities. The Squadron had all the functions and capabilities of a small town.
Lineage
- Established as 689th Aircraft Control and Warning Squadron
- Activated on 1 October 1953
- Redesignated as 689th Radar Squadron (SAGE) on 15 July 1960
- Redesignated as 689th Radar Squadron on 1 February 1974
- Inactivated on 30 June 1979
Assignments
- 4704th Defense Wing, 1 October 1953
- 25th Air Division, 8 October 1954
- Portland Air Defense SectorPortland Air Defense SectorThe Portland Air Defense Sector is an inactive United States Air Force organization. Its last assignment was with the 25th Air Division, being stationed at Adair Air Force Station, Oregon. It was inactivated on 1 April 1966.- History :...
, 1 March 1960 - 25th Air Division, 1 April 1966-30 June 1979
Stations
- Portland AFB (later Portland International Airport), Oregon, 1 October 1953
- Mount Hebo AFS, Oregon, 1 July 1956-30 June 1979