AN/FRD-10
| Circularly Disposed Antenna Array (CDAA) | |
AN/FRD-10, Wahiawa, Hawaii | |
| Country of origin | United States |
|---|---|
| Introduced | 1961 |
| Type | Circularly disposed antenna array (CDAA) |
| Frequency | Low Band 2-9 MHz High Band 9-32 MHz |
| Inner Array Antenna radius | 393.5 feet (119.9 m) |
| Inner Array Reflector radius | 366 feet (112 m) |
| Outer Array Antenna radius | 436.75 feet (133.12 m) 431.75 feet (131.60 m) at 4 sites |
| Outer Array Reflector radius | 423.5 feet (129.1 m) |
| Range | 3,200 nautical miles (5,900 km) |
| Antenna Cost (1970) | $800,000 to $900,000 ($7.29 million today) |
| Electronics Cost (1970) | $20 million ($162 million today) |
The AN/FRD-10 is a United States Navy circularly disposed antenna array (CDAA), built at a number of locations during the Cold War for high frequency radio direction finding (HF/DF) and signals intelligence (SIGINT). 14 sites were originally constructed as a part of the "Classic Bullseye" program. Two AN/FRD-10 systems were later installed in Canada. AN/FRD-10 systems were originally constructed in the early 1960s, but after the dissolution of the Soviet Union, the systems began to be shut down and demolished. The now-disestablished Naval Security Group operated and maintained the U.S. Navy AN/FRD-10 systems. The system had several nicknames including Fred-10 and Elephant or Dinosaur cages. As of 2015, none of the U.S. Navy AN/FRD-10 sites are extant, but the two Canadian sites remain in service. The AN/FLR-9 was a system with a similar design and function, but operated by the U.S. Air Force and U.S. Army.
In accordance with the Joint Electronics Type Designation System (JETDS), the "AN/FRD-10" designation represents the 10th design of an Army-Navy electronic device for fixed radio detection finding system. The JETDS system also now is used to name all Department of Defense electronic systems.