Note 1 - While the AN/FRD-10 was primarily used by NAVSECGRU activities for DF, several were also used for general service communications. Two FRD-10's were installed for communications use at Sugar Grove, WV without the DF goniometer. The Imperial Beach, CA and Skaggs Island, CA FRD-10's were shared by SECGRU and COMMSTA (GENSER) activities.
Note 2 - The CDAA also known as a Wullenweber antenna. The basic principle is that signals from a circular array of antenna elements can be combined with proper phasing to create a high-gain directional antenna which is electrically steerable.
There are lots of photos of FRD-10 antenna systems on the web, but not much info about the inner workings and equipment. Any references, photos, diagrams, etc. would be greatly appreciated.
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 AN/FRD-10 Imperial Beach thanks to Wullenweber/CDAA home page AN/FRD-10(V) manual is NAVSHIPS 94555 AN/FRD-10(XN-2) manual is NAVSHIPS 94593 AN/FRD-10A manual is NAVSHIPS 95744
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Some AN/FRD-10 COMPONENTS - |
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| CU-872/U |  |
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2-32mc
8 outputs - tube Diagram and Circuit Description manual avail from Fair Radio |
| CU-1280/FRD-10A | 
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Multicoupler - 32 output HF for CDAA use
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manuf Sylvania |
| CU-2282/FRD-10A | need photo | Omnidirectional Combiner | - |
| CU-5069/FRD-10A | need photo | Multicoupler - 32 output HF for CDAA use | manuf by TMC for RCA
article with photos - link |
| GO-16/FRD-10(V) | need photo | Goniometer | - |
| GO-17/FRD-10(V) | need photo | Goniometer | - |
| GO-18/FRD-10(V) | need photo | Goniometer | - |
| GO-19/FRD-10(V) | need photo | Goniometer | - |
| GO-34/FRD-10(V) | need photo | Goniometer | - |
| GO-35/FRD-10(V) | need photo | Goniometer | - |
| GO-44/FRD-10(V) | need photo | Goniometer | - |
| PP-3949/FRD-10A | need photo | Power supply ? | - |
| PP-3950/FRD-10A | need photo | Power supply -24vdc, +/- 10vdc | manuf General Dynamics |
| PP-3951/FRD-10A | need photo | Power supply +/- 30vdc | manuf General Dynamics |
| SB-2186/FRD-10A | need photo | Patching Panel, Comm | manuf MVP Micro |
| SB-2187/FRD-10A | need photo | Patching Panel, Antenna | - |
| SB-2188/FRD-10A | need photo | Patching Panel, Antenna | - |
| SB-2202/FRD-10A | need photo | Patching Panel, Comm | manuf MVP Micro |
References
