|Country of origin||United States|
|Frequency||5400 to 5900 MHz|
|Power||~5 megawatts (peak)[verification needed]|
The Avco AN/FPS-26 Radar was an Air Defense Command height finder radar developed in the Frequency Diversity Program with a tunable 3-cavity power klystron for electronic counter-countermeasures (e.g. to counter jamming). Accepted by the Rome Air Development Center on 20 January 1960 for use at SAGE radar stations, the AN/FPS-26 processed height-finder requests (e.g., from Air Defense Direction Centers) by positioning to the azimuth of a target aircraft using a high-pressure hydraulic drive, then "nodding" in either a default automatic mode or by operator command. The inflatable radome required a minimum pressure to prevent contact with the antenna which would result in damage to both (technicians access the antenna deck via an air lock.) To maintain a high dielectric, the waveguide was pressurized with sulfur hexafluoride (SF6), which technicians were warned would produce deadly fluorine if the waveguide arced.
FPS-26 units were installed at Luke AFB, MacDill AFB (1961), Hunter AFB (1961), Chandler AFS (1961), Baudette AFS (1963), Las Vegas Air Force Station (1963), Montauk AFS, Lockport AFS (1962), Fort Fisher AFS (1962), Winston-Salem AFS (1962), North Charleston AFS (1961), Aiken AFS, and Sundance AFS.
A variant was the AN/FPS-26A with tbd which was installed at Cambria AFS (1963), Point Arena AFS, Boron AFS, Hutchinson AFS, North Truro AFS (1963), Calumet AFS, Selfridge AFB, Empire AFS (1963), Finland AFS (1963), Opheim AFS, Highlands AFS, Gibbsboro AFS (1963), Watertown AFS (1963), Sarasota Springs AFS (1963), North Bend AFS, Mt. Hebo AFS, Benton AFS (1963), Oakdale AFS, St. Albans AFS (1963), Manassas AFS (1963), Cape Charles AFS (1963), and Makah AFS.
- Winkler, David F; Webster, Julie L (June 1997). Searching the Skies: The Legacy of the United States Cold War Defense Radar Program (Report). Champaign, IL: U.S. Army Construction Engineering Research Laboratories. LCCN 97020912. http://www.dtic.mil/cgi-bin/GetTRDoc?Location=U2&doc=GetTRDoc.pdf&AD=ADA331231. Retrieved 2013-04-23.
- http://www.radomes.org/museum/equip/fps-26.html AN/FPS-6 @ radomes.org
- Smith, John Q.; Byrd, David A (c. 1991). Forty Years of Research and Development at Griffis Air Force Base: June 1951 – June 1991 (Report). Rome Laboratory. http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA250435. Retrieved 2014-03-10.
- [full citation needed] This article incorporates public domain material from websites or documents of the Air Force Historical Research Agency.