AN/FRD-10 Circularly Disposed Antenna Array (CDAA) Receiving System

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 FRD-10 was shared by SECGRU and COMMSTA 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.

frd10-sys.JPG (61248 bytes) frd10-ant-01.JPG (242716 bytes)
frd10-imp-01.jpg (44451 bytes)
AN/FRD-10 Imperial Beach
thanks to Wullenweber/CDAA home page
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AN/FRD-10 COMPONENTS

CU-1280/FRD-10 CU-1280FRD-1.jpg (40149 bytes)

CU-1280FRD-4.jpg (44773 bytes)

Multicoupler - 32 output HF for CDAA use

CU-1280FRD-3.jpg (43829 bytes)

 

CU-1280FRD-2.jpg (52217 bytes)

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

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