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Home > Hawaii > Wahiawa > U.S. Naval Base, Pearl Harbor, Naval Radio Station, AF/FRD-10 Circularly Disposed Antenna Array, Wahiawa, Honolulu County, HI



Data Pages


Photo Caption Pages


Item Title


Location
AF/FRD-10 Circularly Disposed Antenna Array, Wahiawa, HI

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Created/Published
Documentation compiled after 1933.

Notes
Survey number HABS HI-522-B
Building/structure dates: 1962 initial construction
Significance: The AN/FRD-10 Circularly Disposed Antenna Array (CDAA) at NCTAMS (Facility 314) was a part of the US' Cold War efforts to gather foreign intelligence information. Along with fourteen other FRD-10 CDAAs worldwide, it was part of the Naval Security Group's Classic collection and transmitter locating. This CDAA technology, designed by the Naval Research Laboratory and deployed as the FRD-10, was a radical improvement in the performance of high-frequency direction finding. Its design is the Navy's adaptation of an antenna system using monpole and dipole elements uniformly spaced outside the rings of reflector screens. This, the system is able to intercept and detect the direction of high-frequency radio transmissions covering 360 degrees.

Subjects
Military Facilities
Cold War
Antennas


Collection
Historic American Buildings Survey (Library of Congress)

Contents
Photograph caption(s): 
Overview of Facility 314, view facing northwest
Roadway into Facility 314 showing the roadway cut through the slope formed by leveling the area for the CDAA, note the concrete curb on the right side of the roadway, view facing west
Level area surrounding Facility 314 showing the planted ring that contains the radial ground wires, note the ring beneath the antenna circles is cleared of vegetation and covered with gravel, view facing southwest
Panorama, section 1 of 3, view facing west southwest
Panorama, section 2 of 3, note the Operations Building (Facility 294) in the center of facility, view facing west
Panorama, section 3 of 3, view facing west northwest
Elevation of a portion of the reflector screen and antenna circles from the interior, view facing southeast
Detail of 94' low-band reflector screen posts, note the concrete curb and vertical wires between posts, view facing north northeast
Detail of dipole antenna element (right) and 94' low-band reflector screen poles (left), note the guy wires from the antenna element, view facing north northeast
Detail of 25' high-band reflector screen poles with monopole antenna elements behind, note the metal sleeve bases of the reflector screen poles and the guy wire anchors from the dipole antenna elements (left foreground), view facing north northwest
Detail of monopole antenna element (right) an d25' high-band reflector screen poles (left), view facing northeast
Detail of the base of dipole antenna element with graduated pole, note the arms supporting the vertical wires away from the mast and the metal mesh covering the concrete base, view facing west
Detail of base of monopole antenna element with graduated pole, view facing north
Detail of 25' high-band reflector screen pole showing the horizontal wood beams and vertical wires hung from ceramic insulators, note the dipole antenna element and 94' low-band reflector screen poles in background, view facing north
Detail of the underground wire net mat and cable at the base of a 94' low-band reflector screen pole, view facing north


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