In January 1970, Congress was informed that NSGA Hanza was assigned the mission for providing support to the U.S. Navy which consists of high frequency direction finding (HFDF), Communication Security (COMSEC) and other Naval Security Group functions. Congress was told that the activity receives assistance in services and facilities from nearby Torii Station. The site occupied 132 acres by the 1970s.
The AN/FRD-10 CDAA was developed by the Naval Research Laboratory (NRL), with the assistance of the Department of Electrical Engineering at the University of Illinois, under Project Clarinet Bullseye. The Navy awarded the contract to produce and install the world-wide network of stations to ITT Federal Services in 1959. Eighteen operational systems were built; fourteen were maintained by the Naval Security Group (NSG), two by the National Security Agency (NSA), and two by the Canadian Forces. They replaced AN/GRD-6 HFDF systems at most places (although not at NSGA Kami Seya). The AN/FRD-10 sites in the Pacific, in addition to Hanza, were Guam, Wahiawa in Hawaii, Imperial Beach and Skaggs Island in California, Marietta in Washington, and Adak in Alaska, as well as Masset in British Columbia, Canada.
The AN/FRD-10 at Hanza was the first to become operational. An installation crew consisting of about eight communications technicians destined for Hanza was trained at the ITT factory at Nutley, New Jersey, which was completed on April 13, 1962. An RCA technical representative also participated in the training. Operations began at Hanza in October 1962. The Clarinet Bullseye sub-systems were then installed and became operational in early 1963.
The AN/FRD-10 system consisted of two concentric circles of vertically-polarized antenna elements, one covering the low part of the HF spectrum (with longer wavelengths) and the other the high part of the HF spectrum, together with two tall reflector screens to improve the signal amplitude (or gain), laid on a ground mat of copper wire mesh covered by about three inches of gravel. It was called an outward-looking array because the high band antenna ring for monitoring shorter wavelengths was located on the outside (as compared to the Air Force/Army AN/FLR-9, where the high-band ring was on the inside). Each antenna element was linked by RG-85 A/U 75 ohm very low loss coaxial cables, which also connected them with the Operations Building located at the center of the array. Rotating goniometers (one for each band) in the Operations Building determined the direction of arrival of the target signal and displayed it on a cathode ray tube. The Operations Building also contained AN/FRA-54 recorder/analysis systems and banks of R-390 radio receivers.
The AN/FRD-10 CDAA at Hanza was slightly smaller than its successors. The low band sub-system (which covered from 2 to 8 MHz, or two octaves of frequencies) consisted of 36 folded dipole antennas, about 65 feet in height, spaced 10 degrees of azimuth apart (whereas subsequent AN/FRD-10 low band sub-systems had 40 dipoles). The high band array (8-30 MHz) consisted of 100 sleeve monopole antenna elements, about eight meters high, spaced at 3.6 degrees intervals of azimuth (whereas subsequent FRD-10s typically had 120 monopoles).
Source: Nautilus Institute for Security and Sustainability, 23 December 2015
Station HYPO 
22 June 2019 at 20:07
Was a CTM2 67-73. Worked on support of most electronics at Wahiawa, and Skaggs Island with these “elephant cages” and on some of the gear at Sidi Yahia, Morocco. Worked on a lot of R390’s which were heavy, but you could haul one in each hand as you took them to the repair area (downstairs) and return them to service manually as needed. Saw the first transistor replacement for the R-390 in Morocco which seemed to last for at most a week before some component failed on most of the new receivers. Took a long time to repair as there were no local inventories of spare parts for the new gear, and the Navy supply system did not have them on inventory and sometimes took months to get what was needed. In Hawaii, it was not uncommon to drive down to electronics stores in Honolulu to get simple electrical parts for repair, resistors, capacitors, coils and other items were cheap and available. Don’t know how they were paid for on the “books” because we were not to buy outside of Navy purchasing sources. You do what has to be done to keep the gear up. The same shortage or unavailability of repair parts existed on many electronic units we repaired or calibrated from meters to o’scopes to even electric typewriters (IBM Selectrics) we used.
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24 June 2019 at 05:47
CTM2 1980 1986. I was attached to NRRF IB but rode subs
The elephant cages are all gone
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19 February 2023 at 09:27
has anyone reported serious side effects from working inside these?
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23 February 2023 at 19:41
Having worked at Hanza, Northwest, Winter Harbor, Edzel, Rota, San Vito, Guam, Adak, MisawaJP, and Clark; I am not aware of any electronic human problems.
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