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FPS-14 Short Range Gap Filler Radar Set - A Short Range Gap Filler Radar set built by Bendix Radio Division of Bendix Aviation Corporation. Deployed during the 1950s and early 1960s in unattended gap-filler radar sites to fill in gaps in the long range radar coverage. Used in the SAGE System to directly send target data to a SAGE direction center. The radar antenna was mounted on a three legged tower that came in heights of 28, 40, 54 or 70 feet tall.

FPS-14 Gap Filler Site

The radar set itself was contained in a small two room "L" shaped building with the smaller room containing up to three backup power generators and the larger room containing the dual channel radar set. That room also contained the FST-1 Coordinate Data Transmitter that digitized the radar data and transmitted target data to the direction center via phone lines. Also in that room was the FSW-1 Control Monitor Set that enabled remote control from the radar site of power switching and channel changes on the dual channel equipment. The FSW-1 also monitored up to 30 functions on the site and could control up to 20 functions remotely.

FPS-14 Gap Filler Radar
Element Value Notes
Nomenclature FPS-14
Manufacturer Bendix Radio Division of Bendix Aviation Corporation
Type Gap Filler
Number Made 100~
Frequency 2700-2900MHz
PRF 891 to 909, 1200 pps
Pulse Width 1 us
Rotation Speed 5.33 rpm
Power 460 kw 4J31...4J35 fixed magnetron
5586 (tunable) magnetron
Range 65 nmi Short Range
Altitude 15,000 feet
Introduced 1950s
Stock Number 5840-342-3089

FPS-14 Major Components (edit list)
Component Model Quantity Height Width Deep Weight Notes
Antenna Group OA-897/FPS-14 1 1,668 lb
Transmitter Group OA-864/FPS-14 2 84" 48" 31" 1,543 lb
Receiver Group OA-898/FPS-14 2 84" 48" 27" 720 lb
Control Monitor Group OA-896/FPS-14 1 53" 40" 27" 408 lb
Directional Coupler CU-453/FPS-14 2 7.75" 5.25" 24.5" 32 lb
Waveguide Switch SA-436/FPS-14 1 11.75" 13.25" 13.25 53 lb
Waveguide Tuner TN-243/FPS-14 2
Dummy Load DA-961/FPS-28 1 5" 6.25" 21.5" 31 lb
Voltage Regulator CN-325/FPS-14 2 40.5" 24.5" 17.5" 390 lb
Test & Maintenance Table FN-83/FPS-14 1
Indicator Group OA-1166/FPS-14 1 40" 18.5" 30.5" 213 lb

See Also:


  • Winkler, David F., Searching the skies: the legacy of the United States Cold War defense radar program, USAF Hq Air Combat Command, 1997, 192 pages, Pdf
  • MIL-HDBK-162A, 15 Dec 1965.


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